WO2023207179A1 - Modeling method for carbon sequestration accounting in mulberry field ecological system - Google Patents

Modeling method for carbon sequestration accounting in mulberry field ecological system Download PDF

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WO2023207179A1
WO2023207179A1 PCT/CN2022/142167 CN2022142167W WO2023207179A1 WO 2023207179 A1 WO2023207179 A1 WO 2023207179A1 CN 2022142167 W CN2022142167 W CN 2022142167W WO 2023207179 A1 WO2023207179 A1 WO 2023207179A1
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carbon
mulberry
amount
leaves
biomass
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French (fr)
Chinese (zh)
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许建梅
卞幸儿
储昭权
祝正献
胡亿丰
戴佳洋
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苏州大学
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    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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    • G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
    • G06Q10/063—Operations research, analysis or management
    • G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
    • G06Q50/00—Information and communication technology [ICT] specially adapted for implementation of business processes of specific business sectors, e.g. utilities or tourism
    • G06Q50/04—Manufacturing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/80—Management or planning
    • Y02P90/84—Greenhouse gas [GHG] management systems
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P90/00—Enabling technologies with a potential contribution to greenhouse gas [GHG] emissions mitigation
    • Y02P90/80—Management or planning
    • Y02P90/84—Greenhouse gas [GHG] management systems
    • Y02P90/845—Inventory and reporting systems for greenhouse gases [GHG]

Definitions

  • the invention relates to the technical field of environmental assessment, and in particular to a modeling method for carbon sequestration accounting in mulberry orchard ecosystems.
  • the textile industry has always been an industry with high energy consumption and high carbon emissions. Greenhouse gas emissions in its production and use stages account for 3% of global greenhouse gas emissions. 63% of fibers in the textile industry come from petrochemical products, which will produce a large amount of greenhouse gas emissions. , cotton fiber accounts for 24% of the remaining 37% of fibers, and the cultivation of cotton requires a large amount of water resources, and the large amount of chemical fertilizers, pesticides, etc. used during the cultivation process will cause a great burden on the environment. As pesticides should be avoided as much as possible during the planting of mulberry trees, silk fiber has a relatively small burden on the environment.
  • the amount of carbon sequestration produced during the planting process of mulberry trees only calculates the carbon absorbed by photosynthesis, and does not consider the release and loss of carbon when it circulates in the mulberry orchard ecosystem, and there is a lack of analysis of the mulberry orchard ecosystem in the prior art.
  • the technical problem to be solved by the present invention is to solve the problem in the prior art that there is no scientific and credible accounting method for the carbon sequestration amount of mulberry orchards.
  • the present invention provides a modeling method for carbon sequestration accounting in mulberry orchard ecosystems, including:
  • the total biomass of burned mulberry branches was calculated using the planting density and floor area of each mulberry tree, the amount of mulberry cut per plant, and the moisture content of mulberry branches.
  • the carbon residue calculated based on the total biomass of burned mulberry branches was deducted from the carbon residue produced during burning.
  • the carbon offset of non-carbon dioxide greenhouse gases and the use of natural gas achieved by fuelwood burning is calculated to obtain the net carbon sequestration of mulberry branches used for fuelwood burning;
  • the carbon residue of the mulberry leaf compost is calculated based on the total biomass of the harvested mulberry leaves used for in-situ composting in the mulberry orchard and the weighting factor of the composted mulberry leaves. Based on the carbon residue minus the non-carbon dioxide greenhouse gas emissions, the calculation The carbon sequestration amount of mulberry leaf compost was obtained;
  • the initial net carbon amount of silk fiber is calculated, and the carbon sequestration amount of silk fiber is calculated based on the weight factor of the silk fiber product's one-time release of stored carbon at the end of its service life;
  • the amount of carbon sequestered by silkworm pupae is calculated based on the carbon content in silkworm pupae;
  • the total biomass of silkworm excrement and leftover leaves is used to calculate the amount of carbon sequestered after composting silkworm excrement and leftover leaves;
  • the carbon sequestration amount of mulberry fruits was calculated using the biomass of mulberry fruits;
  • the carbon sequestration amount of underground biomass is calculated using the ratio of annual underground biomass growth to above-ground biomass growth;
  • the net carbon fixation amount of the cut mulberry branches used for fuelwood burning, the carbon fixation amount of the mulberry leaf compost, the carbon fixation amount of the silk fiber, the silkworm pupae carbon fixation amount, the silkworm excrement, and food leftovers The carbon sequestration amount of the leaves after composting, the carbon sequestration amount of the mulberry fruits and the carbon sequestration amount of the underground biomass are calculated together to obtain the final carbon sequestration amount of the mulberry orchard.
  • the total biomass of burned mulberry branches is calculated using the planting density and floor area of each mulberry tree, the amount of mulberry cut per plant, and the moisture content of mulberry branches, and the carbon residue is calculated based on the total biomass of burned mulberry branches,
  • the calculated net carbon sequestration of mulberry branches used for fuelwood burning includes:
  • N is the number of mulberry cuttings in a year
  • n is the number of mulberry tree varieties in the mulberry garden
  • ⁇ i is the planting density of the i-th variety
  • s i is the area occupied by the i-th variety
  • ⁇ branch,i is the i-th variety
  • the weight of the mulberry branches cut on each mulberry tree when cutting mulberry trees of a variety, w branch, i is the moisture content of the mulberry branches;
  • the net carbon sequestration amount C′ 11 of the biocombustion is calculated based on the total biomass m combustion , and the calculation formula is:
  • Coxi mulberry is the oxidation rate of biomass combustion
  • C branch is the carbon content of mulberry branches
  • Coffset combustion is the carbon emissions offset by fuelwood burning
  • the amount of methane emissions produced by a given mass of biomass The amount of nitrous oxide emissions produced for a given mass of biomass.
  • the carbon emission offset combustion calculation formula of the fuelwood combustion is:
  • Coxi mulverry is the oxidation rate of mulberry branch biomass combustion
  • LHV mulberry is the low heating value of mulberry branches
  • EF nGas is the carbon emission coefficient of natural gas
  • LHV nGas is the low heating value of natural gas.
  • the carbon residual amount of the mulberry leaf compost is calculated based on the total biomass of the composted mulberry leaves and the weight factor of the composted mulberry leaves, and the non-carbon dioxide greenhouse gas emissions are subtracted from the carbon residual amount to calculate the mulberry leaf compost.
  • the amount of carbon sequestered by compost includes:
  • ⁇ leaf,i is the weight of the mulberry leaves cut on each mulberry tree when cutting mulberry trees of the i-th variety
  • w leaf,i is the moisture content of the mulberry leaves of the i-th variety mulberry tree
  • the total carbon residue minus non-carbon dioxide greenhouse gas emissions can be calculated by the calculation formula of net carbon sequestration C′ 12 :
  • FW compost is the weighting factor of composted mulberry leaves, C leaf contains carbon, The amount of methane emissions produced by a certain mass of biomass composting process, The amount of nitrous oxide emissions produced by a certain mass of biomass composting process.
  • the weight factor FW compost calculation formula of the composted mulberry leaves is:
  • c i is the carbon loss rate of mulberry leaf compost in the i-th year
  • ⁇ is the annual mineralization rate of soil humus after four years.
  • the initial net carbon amount of silk fiber is calculated using the yield of fresh cocoons, and the carbon fixed amount of silk fiber calculated based on the weight factor of silk fiber includes:
  • m cocoon is the yield of fresh cocoons
  • w fiber is the moisture content of silk fibers
  • C fiber is the carbon content in silk fibers
  • t 0 is the service life after raw silk, pupa lining and long spit are made into various silk products
  • the carbon fixation amount C′ 21 of the silk fiber is calculated. Based on formula (1) and formula (2), the calculation formula is: :
  • the carbon sequestration amount of silkworm pupae calculated based on the carbon content in silkworm pupae includes:
  • the fresh cocoon yield m cocoon is used to calculate the carbon sequestration amount C′ 22 of silkworm pupae.
  • the calculation formula is:
  • C′ 22 m cocoon ⁇ (1-w pupa ) ⁇ C pupa ⁇ (0.76t pupa /100)
  • ⁇ is the percentage of silkworm pupae produced from fresh cocoons
  • w pupa is the water content in silkworm pupae sold as by-products after reeling
  • C pupa is the carbon content in silkworm pupae
  • t pupa is the carbon fixation time.
  • the carbon sequestration amount of silkworm excrement and leftover leaves calculated by using the total biological mass of silkworm excrement and leftover leaves includes:
  • ⁇ is the mass ratio of the amount of fresh cocoons to the amount of dried cocoons when drying fresh cocoons, is the average moisture content of mulberry leaves of different varieties, W dryCocoon is the moisture in dry cocoons, m leafConsum is the amount of mulberry leaves consumed by silkworm respiratory activities;
  • Silkworm excrement and leftover leaves generally need to be composted and then returned to the fields. Since the total biological mass of silkworm excrement and leftover leaves cannot be weighed, the dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the life activities of silkworms are removed. The carbon sequestration amount is calculated based on the amount of consumed mulberry leaves. Then the carbon sequestration amount C′ 23 in silkworm excrement and leftover leaves is calculated as follows:
  • C 23 is the initial net carbon amount in silkworm excrement and leftover leaves
  • FW compost is the carbon residual rate in the composting process
  • m lertover is the total biomass of silkworm excrement and leftover leaves.
  • the initial net carbon amount C 23 in the silkworm excrement and leftover leaves is the net carbon amount in the total supply leaves of the mulberry garden minus the carbon amount in silk fibers, the carbon amount in silkworm pupae, and the carbon dioxide breathed by silkworms.
  • Carbon content its calculation formula is:
  • the carbon sequestration amount of underground biomass is calculated using the ratio of annual underground biomass growth to above-ground biomass growth, and the calculation formula is:
  • ⁇ is the ratio of annual underground biomass growth to above-ground biomass growth
  • C root is the carbon content of underground biomass
  • m fruit is the dry matter mass of mulberries.
  • the invention provides a modeling method for carbon sequestration accounting in a mulberry orchard ecosystem. It models a mulberry orchard carbon sequestration calculation system, analyzes the mulberry orchard carbon cycle from multiple aspects, and establishes a carbon sequestration evaluation method.
  • the method takes into account the amount of loss during the carbon conversion process, and the final release or escape of carbon dioxide caused by mulberry leaf fall, mulberry leaf and mulberry branch consumption, end-of-life disposal of silk products, etc. is considered in the carbon sequestration detection method, which is fair and fair. Transparently detecting the amount of carbon sequestered during the planting process of mulberry trees achieves the reliability of the data results, which is of great significance for the evaluation of carbon sequestration in mulberry orchards.
  • Figure 1 is a flow chart of a first specific embodiment of a modeling method for carbon sequestration accounting in mulberry orchard ecosystems provided by the present invention
  • Figure 2 is a schematic diagram of the carbon cycle of photosynthesis in a mulberry orchard.
  • the core of the present invention is to provide a modeling method for carbon sequestration accounting in the mulberry garden ecosystem.
  • the cycle of photosynthetic carbon absorbed by the mulberry garden ecosystem is divided into seven paths, and the carbon cycle of the mulberry garden is analyzed from these seven aspects. Calculation enables accurate calculation of carbon sequestration for the entire mulberry orchard ecosystem and reduces errors in carbon sequestration.
  • Figure 1 is a flow chart of a first specific embodiment of a modeling method for carbon sequestration accounting in a mulberry ecosystem provided by the present invention; the specific operating steps are as follows:
  • Step S101 Calculate the total biomass of burned mulberry branches based on the planting density and area of each mulberry tree species, the mulberry cutting survey data such as the amount of mulberry cut per plant, the moisture content of mulberry branches, etc., and calculate the carbon based on the total biomass of burned mulberry branches.
  • the residual amount after deducting the non-carbon dioxide greenhouse gases produced during combustion and the carbon offset of natural gas used for fuelwood burning, is calculated to obtain the net carbon sequestration of mulberry branches used for fuelwood burning;
  • the first step is to track the biomass carbon used for fuelwood combustion.
  • the calculation formula for the total biomass m combustion is:
  • N is the number of times of mulberry cutting in a year
  • n is the number of mulberry tree varieties in the mulberry garden
  • ⁇ i is the planting density and area of the i-th variety
  • ⁇ branch,i is the i-th variety of mulberry tree cutting.
  • w branch, i is the moisture content of the mulberry branches
  • the carbon in the burned biomass is biomass carbon formed by absorbing carbon dioxide in the atmosphere and returns to the atmosphere in the form of combustion. Therefore, the carbon dioxide produced during combustion is not calculated in carbon emissions.
  • farmers use mulberry branches as fuelwood to burn, mainly It is used for cooking. Firewood combustion reduces the use of natural gas accordingly.
  • the carbon offset generated by this can be considered;
  • the emissions of methane and nitrous oxide during the biocombustion process are:
  • Coxi mulberry is the oxidation rate of mulberry branch biomass combustion, the low heating value of LHV mulberry mulberry branches, EF nGas is the carbon emission coefficient of natural gas, and LHV nGas is the low heating value of natural gas;
  • C domain is the carbon content of mulberry branches
  • Coffset combustion is the carbon emissions offset by the combustion of fuelwood.
  • Step S102 Calculate the carbon residue of the mulberry leaf compost based on the total biomass of the harvested mulberry leaves used for in-situ composting in the mulberry garden and the weight factor of the composted mulberry leaves, and subtract non-carbon dioxide greenhouse gas emissions based on the carbon residue. The amount of carbon sequestered by mulberry leaf compost is calculated;
  • ⁇ leaf,i is the weight of the mulberry leaves cut on each mulberry tree when cutting mulberry trees of the i-th variety
  • w leaf,i is the moisture content of the mulberry leaves of the i-th variety mulberry tree
  • the model of in-situ composting of mulberry leaves was established with reference to the carbon loss or mass loss of forest litter. Assume that the carbon loss rate c i of the i-th year of in-situ composting of mulberry leaves is c i . The carbon loss rate is larger in the first four years and decreases successively.
  • the soluble carbon (DOC) in the mulberry leaves mainly includes Some small-molecule sugars, organic acids, amino acids and peptides have been mostly decomposed by microorganisms, and their contents are low and tend to be stable. At the same time, microbial metabolites and residues form relatively stable humus during the decomposition of mulberry leaves.
  • the refractory substances in the late decomposition stage of mulberry leaves constitute humus precursor substances.
  • the humification process of leaf litter occurs concomitantly with decomposition.
  • the annual mineralization rate of soil humus formed after four years is basically stable, which is set to ⁇ ;
  • the original carbon amount should be multiplied by a weighting factor when calculating the total carbon released.
  • the calculation formula of the weighting factor is: Then for composted mulberry leaves, the weight factor is:
  • c i is the carbon loss rate of mulberry leaf compost in the i-th year
  • ⁇ is the annual mineralization rate of soil humus after four years
  • the total carbon residue minus non-carbon dioxide greenhouse gas emissions can be calculated by the calculation formula of net carbon sequestration C′ 12 :
  • FW compost is the weighting factor of composted mulberry leaves, C leaf contains carbon, The amount of methane emissions produced by a certain mass of biomass composting process, The amount of methane emissions produced by the composting process for a given mass of biomass.
  • Step S103 Use the yield of fresh cocoons and the silk fiber yield rate of fresh cocoons to calculate the initial net carbon amount of silk fiber. Calculate the carbon sequestration of silk fiber based on the weight factor of the silk fiber product's one-time release of stored carbon at the end of its service life. quantity;
  • Mulberry leaves are fed to silkworms, who spin cocoons.
  • the cocoons are reeled and turned into silkworm pupae, raw silk, spun silk, pupa lining, and defective cocoon cotton.
  • the latter four categories are collectively called silk fibers.
  • Raw silk can be made into silk products such as clothing, ties, scarves, etc.
  • Long silk, cocoon lining, and defective cocoon cotton can be reprocessed into silk thread to make silk products or directly processed into silk quilts.
  • These silk products have a certain service life, and the carbon stored in them is released at one time through incineration, landfill and other means at the end of the service life of various silk products.
  • For a mulberry orchard of a certain area if its fresh cocoon output is m cocoon , the silk fiber production rate of fresh cocoons is ⁇ . Then the initial net carbon content in silk fiber is
  • m cocoon is the yield of fresh cocoons
  • ⁇ is the silk fiber production rate of fresh cocoons
  • w fiber is the moisture content of silk fibers
  • C fiber is the carbon content in silk fibers
  • t 0 is the service life after raw silk, pupa lining and long silk are made into various silk products.
  • the net carbon sequestration amount C′ 21 of silk fiber in the 100-year evaluation period can be calculated as:
  • Step S104 Calculate the amount of carbon fixed by silkworm pupae based on the carbon content in the silkworm pupae;
  • Silkworm pupae have a high carbon content and are generally used as fish or poultry feed additives or in fish bait products.
  • the average time from the formation of silkworm chrysalis to the reeling of silk into various feed products and use is.
  • the silkworm chrysalis is digested as feed and discharged into excrement. At this time, if the excrement is processed into organic fertilizer through composting, further carbon sequestration can still be achieved;
  • C′ 22 m cocoon ⁇ (1-w pupa ) ⁇ C pupa ⁇ (0.76t pupa /100)
  • ⁇ is the percentage of silkworm pupae produced from fresh cocoons
  • w pupa is the water content in silkworm pupae sold as by-products after reeling
  • C pupa is the carbon content in silkworm pupae
  • t pupa is the carbon fixation time.
  • Step S105 Calculate the amount of carbon sequestration after composting silkworm excrement and leftover leaves using the total biomass of silkworm excrement and leftover leaves;
  • Silkworm pellets and leftover leaves are quickly composted through small composting equipment that can control temperature and humidity, or deep burial compost can be used in the mulberry garden.
  • the total biological mass of silkworm excrement and leftover leaves cannot be weighed.
  • the dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the amount of mulberry leaves consumed by silkworms' life activities, m leafConsum , can be removed.
  • the life activities of silkworms convert part of the mulberry leaves consumed into carbon dioxide and excrete it out of the body in the form of respiration.
  • the total leaf supply can be estimated from the annual fresh cocoon production of the mulberry orchard. Generally speaking, 14 kilograms of mulberry leaves are consumed for every 1 kilogram of fresh cocoons. If the average moisture content of different varieties of mulberry leaves is Then the total leaf supply is Therefore, the total biological mass m leftover of silkworm excrement and leftover leaves is:
  • ⁇ is the mass ratio of the amount of fresh cocoons to the amount of dried cocoons when drying fresh cocoons, is the average moisture content of mulberry leaves of different varieties, W dryCocoon is the moisture in dry cocoons, m leafConsum is the amount of mulberry leaves consumed by silkworms’ life activities;
  • C 23 is the initial net carbon amount in silkworm excrement and leftover leaves
  • FW compost is the carbon residual rate in the composting process
  • m leftover is the total biomass of silkworm excrement and leftover leaves.
  • Step S106 Calculate the carbon sequestration amount C′ 3 of the mulberry fruit using the biomass of the mulberry fruit;
  • Step S107 Calculate the carbon sequestration amount of underground biomass using the ratio of annual underground biomass growth to above-ground biomass growth;
  • the growth of underground biomass is directly proportional to the growth of above-ground biomass.
  • the proportional relationship is mainly determined by the climate and soil characteristics of the planting site.
  • the carbon sequestration amount C′ 4 of the underground biomass is calculated by:
  • ⁇ is the ratio of annual underground biomass growth to above-ground biomass growth
  • C root is the carbon content of underground biomass
  • m fruit is the dry matter mass of mulberries.
  • Step S108 Calculate the above carbon sequestration amounts together to obtain the final carbon sequestration amount of the mulberry orchard;
  • C′ 0 (C′ 11 +C′ 12 +C′ 21 +C′ 22 +C′ 23 +C′ 3 +C′ 4 ) ⁇ 44/12.
  • This embodiment provides a modeling method for carbon sequestration accounting in mulberry orchard ecosystems.
  • a mulberry orchard carbon sequestration calculation system By constructing a mulberry orchard carbon sequestration calculation system, the seven circulation pathways of carbon produced by photosynthesis in the mulberry orchard ecosystem for sericulture are analyzed. , calculate the amount of carbon sequestered in the seven circulation pathways respectively, and by tracking the loss during the carbon cycle, we can analyze the burning of mulberry branch firewood, composting of mulberry leaves, carbon conversion of mulberry leaf organisms, and the end-of-use of silk products. Detailed calculations of the final release or escape of carbon dioxide caused by waste, etc. have established a series of accounting models for carbon sequestration in mulberry orchard ecosystems, which is of great significance to the scientific and fair evaluation of carbon sequestration in mulberry orchards.
  • the experimental data of 225 acres of mulberries verify the method steps of the present invention. Please refer to Table 1 for the calculation parameter list of the net carbon amount in mulberry harvesting and Figure 2 for the schematic diagram of the carbon cycle of photosynthesis in the mulberry garden. The details are as follows:
  • the mulberry orchard is cut twice a year, and the mulberry strips are used for fuelwood burning. Calculation of carbon sequestration as biomass burning shows that the total dry matter mass used for fuelwood burning is 228.23t.
  • the methane and nitrous oxide emissions produced during combustion are 2.4 and 0.08 g/kg fuel respectively.
  • Mulberry leaves are generally used for composting. According to Table 1, the total biomass can be calculated to be 158.514t mulberry leaves.
  • microbial metabolites and residues form relatively stable humus during the decomposition of mulberry leaves.
  • the refractory substances in the late decomposition stage of mulberry leaves constitute humus precursor substances.
  • the calculated carbon residue of mulberry leaves in situ compost during the 100-year evaluation period is 13.301tCE.
  • the emissions of methane and nitrous oxide in this example are 0.4085 and 0.1618g/kg of dry compost raw material respectively, and the carbon sequestration amount of the mulberry leaf compost can be obtained C′ 12 is 10.776tCE.
  • Mulberry leaves are fed to silkworms, who spin cocoons.
  • the cocoons are reeled and turned into silkworm pupae, raw silk, spun silk, pupa lining, and defective cocoon cotton.
  • the latter four categories are collectively called silk fibers.
  • Raw silk can be made into silk products such as clothing, ties, scarves, etc.
  • Long silk, cocoon lining, and defective cocoon cotton can be reprocessed into silk thread to make silk products or directly processed into silk quilts. These silk products have a certain service life, and the carbon stored in them is released at one time through incineration, landfill and other means at the end of the service life of various silk products.
  • the sericulture base's annual fresh cocoon output in 2020 is 21,625kg.
  • the silk fiber production rate of fresh cocoons is 16.29%, the moisture content of silk fiber is 9.91%, and the carbon content in silk fiber is 38%. It is assumed that raw silk, pupa lining, and long spit After being made into various silk products, the service life is 15 years. It can be calculated that the carbon sequestration amount C′ 21 of silk fiber in the 100-year evaluation period is 0.1375tCE.
  • Silkworm pupae have a high carbon content and are generally used as fish or poultry feed additives or in fish bait products.
  • the average time from the formation of silkworm chrysalis to the reeling of silk into various feed products and their use is 2 years.
  • Silkworm chrysalises are digested as feed and discharged into excrement. At this time, if the excrement is composted and processed into organic fertilizer, further carbon sequestration can still be achieved. .
  • the carbon residue after digestion is not considered, and only the one-time carbon emission when it becomes feed after 2 years is considered.
  • the carbon content in silkworm pupae is 54.5%, the moisture content is 9.91%, and the percentage of silkworm pupae produced from fresh cocoons is 19.916%. It can be calculated that the carbon fixation amount C′ 22 in silkworm pupae is 0.032tCE.
  • Silkworm pellets and leftover leaves are quickly composted through small composting equipment that can control temperature and humidity, or deep burial compost can be used in the mulberry garden.
  • the total biological mass of silkworm excrement and leftover leaves cannot be weighed.
  • the dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the amount of mulberry leaves consumed by silkworms' life activities can be removed.
  • the life activities of silkworms convert part of the mulberry leaves consumed into carbon dioxide and excrete it out of the body in the form of respiration.
  • the total leaf supply can be estimated from the annual fresh cocoon production of the mulberry garden. Generally speaking, 14 kilograms of mulberry leaves are consumed for every 1 kilogram of fresh cocoons.
  • the total fresh cocoon production is 21.625 tons.
  • the mass ratio of the amount of fresh cocoons to the amount of dried cocoons is 2.74.
  • the dry cocoons are not dried until they are completely free of moisture.
  • the dry cocoons will still absorb moisture from the air to achieve a moisture balance.
  • the moisture content in the dry cocoon at this time is 9.91%. It can be calculated that the total dry matter mass of silkworm excrement and leftover leaves is 76.742t, and the net carbon amount in silkworm excrement and leftover leaves can be calculated to be 35.209tCE. Finally, the carbon sequestration amount C of silkworm excrement and leftover leaves can be calculated. ′ 23 is 5.207tCE.
  • the carbon dioxide formed by the photosynthesis of the mulberry fruit basically returns to the air, so the amount of carbon fixed in the mulberry fruit C′ 3 is 0.
  • the ratio of underground biomass to above-ground biomass of mulberry trees is 0.23, and the carbon content of underground biomass is the IPCC default value of 0.5. Then the underground carbon sequestration amount C′ 4 can be calculated to be 55.121tCE.
  • the total carbon sequestration amount of the entire mulberry garden in 2020 is 141.66tCE, totaling 519.418tCO2e.
  • the total carbon sequestration amount of the entire mulberry garden in 2020 is 141.66tCE, totaling 519.418tCO2e.
  • the total carbon sequestration amount of the entire mulberry garden in 2020 is 141.66tCE, totaling 519.418tCO2e.
  • This embodiment provides a modeling method for accounting for carbon sequestration in a mulberry garden ecosystem. It establishes a carbon sequestration calculation model for the mulberry garden ecosystem and divides the carbon sequestration of the mulberry garden ecosystem into seven parts and seven paths. Data analysis was conducted on the carbon sequestration calculation of carbon in the seven pathways during the 100-year evaluation period, and the carbon sequestration data of the entire mulberry ecosystem was obtained. This solved the problem of large rough errors in current carbon sequestration calculations using empirical formulas, and clarified The carbon release of each part enables precise detection of carbon sequestration in the mulberry garden.

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Abstract

Disclosed is a modeling method for carbon sequestration accounting in a mulberry field ecological system, comprising calculating a total biomass of mulberry branches used for firewood combustion by using basic planting information of a mulberry field and mulberry trimming amount data, so as to build a carbon sequestration accounting model for firewood combustion of trimmed mulberry branches that considers carbon offsets and a greenhouse gas emission during combustion; building a carbon emission model for in situ composting of mulberry leaves, so as to calculate a carbon residue of composting to obtain a carbon sequestration accounting model for trimmed mulberry leaves; building a carbon sequestration amount model for silk fibers and silkworm chrysalis in a 100-year evaluation period; building a carbon sequestration amount accounting model for silkworm excrement and leftover leaves that considers a greenhouse gas emission during composting and a carbon dioxide emission during respiration of silkworms; and molding seven carbon circulation paths such as mulberry fruit and underground biomass carbon sequestration amount accounting models. According to the present invention, carbon loss and carbon offsets of seven circulation paths of photosynthesis carbon are separately modeled, an accurate and reliable mulberry field carbon sequestration accounting model is explored, and the present invention has important significance in conducting quantitative evaluation on carbon sequestration of the mulberry field.

Description

一种桑园生态系统固碳核算的建模方法A modeling method for carbon sequestration accounting in mulberry orchard ecosystems 技术领域Technical field
本发明涉及环境评价技术领域，特别是涉及一种桑园生态系统固碳核算的建模方法。The invention relates to the technical field of environmental assessment, and in particular to a modeling method for carbon sequestration accounting in mulberry orchard ecosystems.
背景技术Background technique
近年来全球气候变暖对自然环境和人类经济发展构成了严重威胁，而气候变暖主要是因为人类生产活动导致了大量温室气体(GHG)包括二氧化碳、甲烷、和氮氧化物等的排放。温室气体排放量可以用碳足迹来衡量，产品的碳足迹是指在该产品生命周期内所有阶段产生的温室气体排放与清除的总量，用二氧化碳当量(CO2-eq)表示。中国习总书记在第75届联合国大会上提出中国的双碳目标，即2030年碳达峰，2060年实现碳中和。而对产品进行碳足迹检测则可为企业节能减排进行低碳生产提供数据参考。In recent years, global climate warming has posed a serious threat to the natural environment and human economic development. Climate warming is mainly due to the emission of large amounts of greenhouse gases (GHG) including carbon dioxide, methane, and nitrogen oxides due to human production activities. Greenhouse gas emissions can be measured by carbon footprint. The carbon footprint of a product refers to the total amount of greenhouse gas emissions and removals produced during all stages of the product's life cycle, expressed in carbon dioxide equivalents (CO2-eq). Chinese General Secretary Xi Jinping proposed China’s dual carbon goals at the 75th United Nations General Assembly, that is, carbon peaking in 2030 and achieving carbon neutrality in 2060. The carbon footprint testing of products can provide data reference for enterprises to save energy and reduce emissions and carry out low-carbon production.
纺织业一直属于高能耗高碳排放的行业，其生产与使用阶段的温室气体排放占全球温室气体排放的3％，纺织业中63％的纤维来源于石油化工产品，会产生大量的温室气体排放，剩下的37％的纤维中棉纤维占到了24％，而棉花的种植需要大量的水资源，并且种植过程中大量使用的化肥、杀虫剂等会对环境造成很大的负担。而蚕丝纤维因桑树种植过程中应尽量避免使用农药，所以对环境的负担要相对较小。The textile industry has always been an industry with high energy consumption and high carbon emissions. Greenhouse gas emissions in its production and use stages account for 3% of global greenhouse gas emissions. 63% of fibers in the textile industry come from petrochemical products, which will produce a large amount of greenhouse gas emissions. , cotton fiber accounts for 24% of the remaining 37% of fibers, and the cultivation of cotton requires a large amount of water resources, and the large amount of chemical fertilizers, pesticides, etc. used during the cultivation process will cause a great burden on the environment. As pesticides should be avoided as much as possible during the planting of mulberry trees, silk fiber has a relatively small burden on the environment.
但是现有技术中关于桑树种植过程中产生的固碳量仅计算光合作用吸收的碳，未考虑碳在桑园生态系统中循环时的释放与损失，且现有技术中缺少对于桑园生态系统中碳循环释放与损失的计算方式，没有有效的数据来证明蚕丝纤维的环保与可持续特点。因此，需要设计一种桑园生态系统固碳核算的建模方法，已解决现有技术中针对桑园固碳量没有科学、可信的检测方法的问题。However, in the prior art, the amount of carbon sequestration produced during the planting process of mulberry trees only calculates the carbon absorbed by photosynthesis, and does not consider the release and loss of carbon when it circulates in the mulberry orchard ecosystem, and there is a lack of analysis of the mulberry orchard ecosystem in the prior art. There is no effective data to prove the environmental protection and sustainable characteristics of silk fiber based on the calculation method of medium carbon cycle release and loss. Therefore, it is necessary to design a modeling method for carbon sequestration accounting in mulberry orchard ecosystems, which has solved the problem in the existing technology that there is no scientific and credible detection method for the carbon sequestration in mulberry orchards.
发明内容Contents of the invention
为此，本发明所要解决的技术问题在于解决现有技术中针对桑园固碳量没有科学、可信的核算方法的问题。To this end, the technical problem to be solved by the present invention is to solve the problem in the prior art that there is no scientific and credible accounting method for the carbon sequestration amount of mulberry orchards.
为解决上述技术问题，本发明提供一种桑园生态系统固碳核算的建模方法，包括：In order to solve the above technical problems, the present invention provides a modeling method for carbon sequestration accounting in mulberry orchard ecosystems, including:
利用各桑树品种植密度和占地面积、每株伐桑量、桑枝含水率计算燃烧桑枝总生物质量，根据所述燃烧桑枝总生物质量计算得到的碳残留量，扣除燃烧时产生的非二氧化碳温室气体以及薪材燃烧实现的天然气使用的碳抵消，计算得到用于薪材燃烧的伐桑桑枝的净固碳量；The total biomass of burned mulberry branches was calculated using the planting density and floor area of each mulberry tree, the amount of mulberry cut per plant, and the moisture content of mulberry branches. The carbon residue calculated based on the total biomass of burned mulberry branches was deducted from the carbon residue produced during burning. The carbon offset of non-carbon dioxide greenhouse gases and the use of natural gas achieved by fuelwood burning is calculated to obtain the net carbon sequestration of mulberry branches used for fuelwood burning;
根据用于桑园原地堆肥的伐桑桑叶的总生物质量以及堆肥桑叶的权重因子求出桑叶堆肥的碳残留量，基于所述碳残留量减去非二氧化碳温室气体排放量，计算得出桑叶堆肥固碳量；The carbon residue of the mulberry leaf compost is calculated based on the total biomass of the harvested mulberry leaves used for in-situ composting in the mulberry orchard and the weighting factor of the composted mulberry leaves. Based on the carbon residue minus the non-carbon dioxide greenhouse gas emissions, the calculation The carbon sequestration amount of mulberry leaf compost was obtained;
利用鲜茧产量，以及鲜茧的蚕丝纤维出丝率，求出蚕丝纤维初始净碳量，基于蚕丝纤维产品在使用寿命终结时一次性释放存储碳的权重因子计算得蚕丝纤维固碳量；Using the yield of fresh cocoons and the silk fiber yield rate of fresh cocoons, the initial net carbon amount of silk fiber is calculated, and the carbon sequestration amount of silk fiber is calculated based on the weight factor of the silk fiber product's one-time release of stored carbon at the end of its service life;
基于蚕蛹中碳含量计算得蚕蛹固碳量；The amount of carbon sequestered by silkworm pupae is calculated based on the carbon content in silkworm pupae;
利用蚕砂与食剩叶的总生物质量计算蚕砂、食剩叶堆肥后的固碳量；The total biomass of silkworm excrement and leftover leaves is used to calculate the amount of carbon sequestered after composting silkworm excrement and leftover leaves;
利用桑果生物质量计算得桑果的固碳量；The carbon sequestration amount of mulberry fruits was calculated using the biomass of mulberry fruits;
利用地下年生物质增长量与地上生物质增长量的比例计算得地下生物质的固碳量；The carbon sequestration amount of underground biomass is calculated using the ratio of annual underground biomass growth to above-ground biomass growth;
将所述用于薪材燃烧的伐桑桑枝的净固碳量、所述桑叶堆肥固碳量、所述蚕丝纤维固碳量、所述蚕蛹固碳量、所述蚕砂、食剩叶堆肥后的固碳量、所述桑果的固碳量和所述地下生物质的固碳量合并计算，得到最终桑园固碳量。The net carbon fixation amount of the cut mulberry branches used for fuelwood burning, the carbon fixation amount of the mulberry leaf compost, the carbon fixation amount of the silk fiber, the silkworm pupae carbon fixation amount, the silkworm excrement, and food leftovers The carbon sequestration amount of the leaves after composting, the carbon sequestration amount of the mulberry fruits and the carbon sequestration amount of the underground biomass are calculated together to obtain the final carbon sequestration amount of the mulberry orchard.
优选地，所述利用各桑树品种植密度和占地面积、每株伐桑量、桑枝含水率计算燃烧桑枝总生物质量，根据所述燃烧桑枝总生物质量计算得到的碳残留量，扣除燃烧时产生的非二氧化碳温室气体以及薪材燃烧实现的天然气使用的碳抵消，计算得到用于薪材燃烧的伐桑桑枝的净固碳量包括：Preferably, the total biomass of burned mulberry branches is calculated using the planting density and floor area of each mulberry tree, the amount of mulberry cut per plant, and the moisture content of mulberry branches, and the carbon residue is calculated based on the total biomass of burned mulberry branches, After deducting the non-carbon dioxide greenhouse gases produced during combustion and the carbon offset of natural gas used for fuelwood burning, the calculated net carbon sequestration of mulberry branches used for fuelwood burning includes:
对用作薪材燃烧的生物质碳的追踪，计算燃烧总生物质量m combustion，其计算公式为： To track the biomass carbon used for fuelwood combustion, calculate the total biomass burned m combustion , the calculation formula is:
Figure PCTCN2022142167-appb-000001
Figure PCTCN2022142167-appb-000001
其中，N为一年伐桑的次数，n为桑园的桑树品种数，ρ i为第i个品种的种植密度，s i为第i个品种的占地面积，λ branch,i为第i个品种桑树伐桑时每株桑树上所伐桑枝的重量，w branch,i是桑枝的含水量； Among them, N is the number of mulberry cuttings in a year, n is the number of mulberry tree varieties in the mulberry garden, ρ i is the planting density of the i-th variety, s i is the area occupied by the i-th variety, λ branch,i is the i-th variety The weight of the mulberry branches cut on each mulberry tree when cutting mulberry trees of a variety, w branch, i is the moisture content of the mulberry branches;
基于所述燃烧总生物质量m combustion计算所述生物燃烧净固碳量C′ 11，其计算公式为： The net carbon sequestration amount C′ 11 of the biocombustion is calculated based on the total biomass m combustion , and the calculation formula is:
Figure PCTCN2022142167-appb-000002
Figure PCTCN2022142167-appb-000002
其中，Coxi mulberry为生物质燃烧的氧化率，C branch是桑枝的含碳量，Coffset combustion为薪材燃烧抵消的碳排放，
Figure PCTCN2022142167-appb-000003
为一定质量的生物质产生的甲烷排放量，
Figure PCTCN2022142167-appb-000004
为一定质量的生物质产生的氧化亚氮的排放量。 Among them, Coxi mulberry is the oxidation rate of biomass combustion, C branch is the carbon content of mulberry branches, Coffset combustion is the carbon emissions offset by fuelwood burning,
Figure PCTCN2022142167-appb-000003
The amount of methane emissions produced by a given mass of biomass,
Figure PCTCN2022142167-appb-000004
The amount of nitrous oxide emissions produced for a given mass of biomass.
优选地，所述薪材燃烧抵消的碳排放Coffset combustion计算公式为： Preferably, the carbon emission offset combustion calculation formula of the fuelwood combustion is:
Coffset combustion＝12m combution×Coxi mulberry×LHV mulberry Coffset combustion = 12m combustion × Coxi mulberry × LHV mulberry
×EF nGas/(LHV nGas×44) ×EF nGas /(LHV nGas ×44)
其中，Coxi mulverry为桑枝生物质燃烧的氧化率，LHV mulberry为桑枝的低位发热值，EF nGas为天然气的碳排放系数，LHV nGas为天然气的低位发热值。 Among them, Coxi mulverry is the oxidation rate of mulberry branch biomass combustion, LHV mulberry is the low heating value of mulberry branches, EF nGas is the carbon emission coefficient of natural gas, and LHV nGas is the low heating value of natural gas.
优选地，所述根据堆肥桑叶的总生物质量以及堆肥桑叶的权重因子求出桑叶堆肥的碳残留量，基于所述碳残留量减去非二氧化碳温室气体排放量，计算得出桑叶堆肥固碳量包括：Preferably, the carbon residual amount of the mulberry leaf compost is calculated based on the total biomass of the composted mulberry leaves and the weight factor of the composted mulberry leaves, and the non-carbon dioxide greenhouse gas emissions are subtracted from the carbon residual amount to calculate the mulberry leaf compost. The amount of carbon sequestered by compost includes:
计算堆肥的总生物质量m compost，其计算公式为： Calculate the total biomass m compost of compost, and its calculation formula is:
Figure PCTCN2022142167-appb-000005
Figure PCTCN2022142167-appb-000005
其中，λ leaf,i为第i个品种桑树伐桑时每株桑树上所伐桑叶的重量， w leaf,i为第i个品种桑树桑叶的含水量； Among them, λ leaf,i is the weight of the mulberry leaves cut on each mulberry tree when cutting mulberry trees of the i-th variety, w leaf,i is the moisture content of the mulberry leaves of the i-th variety mulberry tree;
基于堆肥的桑叶，总碳残留量减去非二氧化碳温室气体排放，得净固碳量C′ 12计算公式为： Based on composted mulberry leaves, the total carbon residue minus non-carbon dioxide greenhouse gas emissions can be calculated by the calculation formula of net carbon sequestration C′ 12 :
Figure PCTCN2022142167-appb-000006
Figure PCTCN2022142167-appb-000006
其中，FW compost为堆肥桑叶的权重因子，C leaf桑叶含碳量，
Figure PCTCN2022142167-appb-000007
为一定质量的生物质堆肥过程产生的甲烷排放量，
Figure PCTCN2022142167-appb-000008
为一定质量的生物质堆肥过程产生的氧化亚氮排放量。 Among them, FW compost is the weighting factor of composted mulberry leaves, C leaf contains carbon,
Figure PCTCN2022142167-appb-000007
The amount of methane emissions produced by a certain mass of biomass composting process,
Figure PCTCN2022142167-appb-000008
The amount of nitrous oxide emissions produced by a certain mass of biomass composting process.
优选地，所述堆肥桑叶的权重因子FW compost计算公式为： Preferably, the weight factor FW compost calculation formula of the composted mulberry leaves is:
Figure PCTCN2022142167-appb-000009
Figure PCTCN2022142167-appb-000009
其中，c i为桑叶堆肥第i年的碳损失率，γ为四年后成型土壤腐殖质年矿化率。 Among them, c i is the carbon loss rate of mulberry leaf compost in the i-th year, and γ is the annual mineralization rate of soil humus after four years.
优选地，所述利用鲜茧产量求出蚕丝纤维初始净碳量，基于蚕丝纤维的权重因子计算得蚕丝纤维固碳量包括：Preferably, the initial net carbon amount of silk fiber is calculated using the yield of fresh cocoons, and the carbon fixed amount of silk fiber calculated based on the weight factor of silk fiber includes:
计算蚕丝纤维中初始净碳量C 21，其计算公式为： To calculate the initial net carbon content C 21 in silk fiber, the calculation formula is:
C 21＝m cocoon×β×(1-w fiber)×C fiber    (1) C 21 =m cocoon ×β×(1-w fiber )×C fiber (1)
其中，m cocoon为鲜茧产量，为鲜茧的蚕丝纤维产丝率，w fiber为蚕丝纤维的含水率，C fiber为蚕丝纤维中的碳含量； Among them, m cocoon is the yield of fresh cocoons, is the silk fiber production rate of fresh cocoons, w fiber is the moisture content of silk fibers, and C fiber is the carbon content in silk fibers;
计算蚕丝纤维在100年评价期内的权重因子FW fiber，其计算公式为： Calculate the weight factor FW fiber of silk fiber within the 100-year evaluation period. The calculation formula is:
FW fiber＝1-0.76t 0/100    (2) FW fiber ＝1-0.76t 0 /100 (2)
其中，t 0为生丝、蛹衬、长吐做成各类丝绸产品后使用寿命； Among them, t 0 is the service life after raw silk, pupa lining and long spit are made into various silk products;
基于蚕丝纤维中初始净碳量与蚕丝纤维在100年评价期内的权重因子FW fiber，计算所述蚕丝纤维固碳量C′ 21，基于公式(1)和公式(2)，其计算公式为： Based on the initial net carbon amount in the silk fiber and the weight factor FW fiber of the silk fiber within the 100-year evaluation period, the carbon fixation amount C′ 21 of the silk fiber is calculated. Based on formula (1) and formula (2), the calculation formula is: :
C′ 21＝C 21×(1-FW fiber) C′ 21 =C 21 ×(1-FW fiber )
＝m cocoon×β×(1-w fiber)×C fiber×(0.76t 0/100)。 =m cocoon ×β×(1-w fiber )×C fiber ×(0.76t 0 /100).
优选地，所述基于蚕蛹中碳含量计算得蚕蛹固碳量包括：Preferably, the carbon sequestration amount of silkworm pupae calculated based on the carbon content in silkworm pupae includes:
对桑叶中碳流向蚕蛹的固碳计算，利用鲜茧产量m cocoon计算蚕蛹固碳量C′ 22，其计算公式为： To calculate the carbon sequestration of carbon in mulberry leaves flowing to silkworm pupae, the fresh cocoon yield m cocoon is used to calculate the carbon sequestration amount C′ 22 of silkworm pupae. The calculation formula is:
C′ 22＝m cocoon×α×(1-w pupa)×C pupa×(0.76t pupa/100) C′ 22 =m cocoon ×α×(1-w pupa )×C pupa ×(0.76t pupa /100)
其中，α为鲜茧产出蚕蛹的百分比，w pupa为缫丝后作为副产品售卖的蚕蛹中的含水量，C pupa为蚕蛹中的碳含量，t pupa为固碳时长。 Among them, α is the percentage of silkworm pupae produced from fresh cocoons, w pupa is the water content in silkworm pupae sold as by-products after reeling, C pupa is the carbon content in silkworm pupae, and t pupa is the carbon fixation time.
优选地，所述利用蚕砂与食剩叶的总生物质量计算得蚕砂、食剩叶的固碳量包括：Preferably, the carbon sequestration amount of silkworm excrement and leftover leaves calculated by using the total biological mass of silkworm excrement and leftover leaves includes:
计算蚕砂与食剩叶的总生物质量m leftover，其计算公式为： Calculate the total biological mass m leftover of silkworm excrement and leftover leaves. The calculation formula is:
Figure PCTCN2022142167-appb-000010
Figure PCTCN2022142167-appb-000010
其中，θ为鲜茧烘茧时鲜茧量与烘出的干茧量的质量比，
Figure PCTCN2022142167-appb-000011
为不同品种桑叶的平均含水量，W dryCocoon为干茧中的水份，m leafConsum为蚕呼吸活动消耗掉的桑叶量； Among them, θ is the mass ratio of the amount of fresh cocoons to the amount of dried cocoons when drying fresh cocoons,
Figure PCTCN2022142167-appb-000011
is the average moisture content of mulberry leaves of different varieties, W dryCocoon is the moisture in dry cocoons, m leafConsum is the amount of mulberry leaves consumed by silkworm respiratory activities;
蚕砂与食剩叶一般要经过堆肥处理，再还田，由于蚕砂与食剩叶的总生物质量无法称量，可以通过总桑叶量减去蚕茧的干物质量，再去除掉蚕生命活动消耗掉的桑叶量来计算固碳量，则蚕砂、食剩叶中固碳量C′ 23计算公式为： Silkworm excrement and leftover leaves generally need to be composted and then returned to the fields. Since the total biological mass of silkworm excrement and leftover leaves cannot be weighed, the dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the life activities of silkworms are removed. The carbon sequestration amount is calculated based on the amount of consumed mulberry leaves. Then the carbon sequestration amount C′ 23 in silkworm excrement and leftover leaves is calculated as follows:
Figure PCTCN2022142167-appb-000012
Figure PCTCN2022142167-appb-000012
其中，C 23为蚕砂与食剩叶中的初始净碳量，FW compost为堆肥过程中的碳残留率，m lertover为蚕砂与食剩叶的总生物质量。 Among them, C 23 is the initial net carbon amount in silkworm excrement and leftover leaves, FW compost is the carbon residual rate in the composting process, and m lertover is the total biomass of silkworm excrement and leftover leaves.
优选地，所述蚕砂与食剩叶中的初始净碳量C 23为桑园总供叶中的净碳量减去蚕丝纤维中的碳量、蚕蛹的碳量以及蚕呼吸的二氧化碳中的碳量，其计算公式为： Preferably, the initial net carbon amount C 23 in the silkworm excrement and leftover leaves is the net carbon amount in the total supply leaves of the mulberry garden minus the carbon amount in silk fibers, the carbon amount in silkworm pupae, and the carbon dioxide breathed by silkworms. Carbon content, its calculation formula is:
Figure PCTCN2022142167-appb-000013
Figure PCTCN2022142167-appb-000013
其中，C fiber蚕丝纤维中的碳含量。 Among them, the carbon content in C fiber silk fiber.
优选地，所述利用地下年生物质增长量与地上生物质增长量的比例计算得地下生物质的固碳量，其计算公式为：Preferably, the carbon sequestration amount of underground biomass is calculated using the ratio of annual underground biomass growth to above-ground biomass growth, and the calculation formula is:
Figure PCTCN2022142167-appb-000014
Figure PCTCN2022142167-appb-000014
其中，τ为地下年生物质增长量与地上生物质增长量的比例，C root为地下生物质量的含碳量，m fruit为桑果的干物质量。 Among them, τ is the ratio of annual underground biomass growth to above-ground biomass growth, C root is the carbon content of underground biomass, and m fruit is the dry matter mass of mulberries.
本发明所提供的一种桑园生态系统固碳核算的建模方法，对桑园固碳量计算系统进行建模，分别从多个方面对桑园碳循环进行分析，建立了固碳评价的方法，考虑了碳转换过程中的损失量，并且在固碳检测方法中考虑了桑叶落叶、桑叶桑枝消耗、丝绸产品的使用终期废弃等带来的二氧化碳最终释放或逃逸，公正、透明的对桑树种植过程中的固碳量进行检测，实现了数据结果的可靠性，对桑园固碳评价具有重要意义。The invention provides a modeling method for carbon sequestration accounting in a mulberry orchard ecosystem. It models a mulberry orchard carbon sequestration calculation system, analyzes the mulberry orchard carbon cycle from multiple aspects, and establishes a carbon sequestration evaluation method. The method takes into account the amount of loss during the carbon conversion process, and the final release or escape of carbon dioxide caused by mulberry leaf fall, mulberry leaf and mulberry branch consumption, end-of-life disposal of silk products, etc. is considered in the carbon sequestration detection method, which is fair and fair. Transparently detecting the amount of carbon sequestered during the planting process of mulberry trees achieves the reliability of the data results, which is of great significance for the evaluation of carbon sequestration in mulberry orchards.
附图说明Description of drawings
为了更清楚的说明本发明实施例或现有技术的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单的介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。In order to explain the embodiments of the present invention or the technical solutions of the prior art more clearly, the following will briefly introduce the drawings needed to describe the embodiments or the prior art. Obviously, the drawings in the following description are only For some embodiments of the present invention, those of ordinary skill in the art can also obtain other drawings based on these drawings without exerting creative efforts.
图1为本发明所提供的一种桑园生态系统固碳核算的建模方法的第一种具体实施例的流程图；Figure 1 is a flow chart of a first specific embodiment of a modeling method for carbon sequestration accounting in mulberry orchard ecosystems provided by the present invention;
图2为桑园光合作用碳循环示意图。Figure 2 is a schematic diagram of the carbon cycle of photosynthesis in a mulberry orchard.
具体实施方式Detailed ways
本发明的核心是提供一种桑园生态系统固碳核算的建模方法，将桑园生态系统吸收的光合作用碳的循环分成了七条路径，分别从这七个方面对桑园碳循环进行分析计算，实现了对整个桑园生态系统的固 碳量精确计算，降低了固碳量的误差。The core of the present invention is to provide a modeling method for carbon sequestration accounting in the mulberry garden ecosystem. The cycle of photosynthetic carbon absorbed by the mulberry garden ecosystem is divided into seven paths, and the carbon cycle of the mulberry garden is analyzed from these seven aspects. Calculation enables accurate calculation of carbon sequestration for the entire mulberry orchard ecosystem and reduces errors in carbon sequestration.
为了使本技术领域的人员更好地理解本发明方案，下面结合附图和具体实施方式对本发明作进一步的详细说明。显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。In order to enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.
请参考图1，图1为本发明所提供的一种桑园生态系统固碳核算的建模方法的第一种具体实施例的流程图；具体操作步骤如下：Please refer to Figure 1, which is a flow chart of a first specific embodiment of a modeling method for carbon sequestration accounting in a mulberry ecosystem provided by the present invention; the specific operating steps are as follows:
步骤S101：各桑树品种植密度和占地面积、伐桑调研数据如每株伐桑量、桑枝含水率等计算燃烧桑枝总生物质量，根据所述燃烧桑枝总生物质量计算得到的碳残留量，扣除燃烧时产生的非二氧化碳温室气体以及薪材燃烧实现的天然气使用的碳抵消，计算得到用于薪材燃烧的伐桑桑枝的净固碳量；Step S101: Calculate the total biomass of burned mulberry branches based on the planting density and area of each mulberry tree species, the mulberry cutting survey data such as the amount of mulberry cut per plant, the moisture content of mulberry branches, etc., and calculate the carbon based on the total biomass of burned mulberry branches. The residual amount, after deducting the non-carbon dioxide greenhouse gases produced during combustion and the carbon offset of natural gas used for fuelwood burning, is calculated to obtain the net carbon sequestration of mulberry branches used for fuelwood burning;
对作为生物质燃烧的固碳计算，首先是用作薪材燃烧的生物质碳的追踪，其燃烧总生物质量m combustion计算公式为： For the calculation of carbon sequestration as biomass combustion, the first step is to track the biomass carbon used for fuelwood combustion. The calculation formula for the total biomass m combustion is:
Figure PCTCN2022142167-appb-000015
Figure PCTCN2022142167-appb-000015
其中，N是一年伐桑的次数，n是桑园的桑树品种数，ρ i，s i是第i个品种的种植密度和占地面积，λ branch,i为第i个品种桑树伐桑时每株桑树上所伐桑枝的重量，w branch,i是桑枝的含水量； Among them, N is the number of times of mulberry cutting in a year, n is the number of mulberry tree varieties in the mulberry garden, ρ i , s i is the planting density and area of the i-th variety, λ branch,i is the i-th variety of mulberry tree cutting. is the weight of the mulberry branches cut on each mulberry tree, w branch, i is the moisture content of the mulberry branches;
燃烧掉的生物质中的碳是吸收大气中二氧化碳形成的生物质碳，以燃烧的形式再次回到大气中，因此燃烧时产生的二氧化碳不计算碳排放，农户采用桑枝作为薪材燃烧，主要是用于炊煮。薪材燃烧则相应的减少了天然气的使用。可以考虑这部分产生的碳抵销；The carbon in the burned biomass is biomass carbon formed by absorbing carbon dioxide in the atmosphere and returns to the atmosphere in the form of combustion. Therefore, the carbon dioxide produced during combustion is not calculated in carbon emissions. Farmers use mulberry branches as fuelwood to burn, mainly It is used for cooking. Firewood combustion reduces the use of natural gas accordingly. The carbon offset generated by this can be considered;
生物燃烧过程中甲烷和氧化亚氮排放量为：The emissions of methane and nitrous oxide during the biocombustion process are:
Figure PCTCN2022142167-appb-000016
Figure PCTCN2022142167-appb-000016
其中，
Figure PCTCN2022142167-appb-000017
为一定质量的生物质产生的甲烷排放量，
Figure PCTCN2022142167-appb-000018
为一定质量的生物质产生的氧化亚氮的排放量； in,
Figure PCTCN2022142167-appb-000017
The amount of methane emissions produced by a given mass of biomass,
Figure PCTCN2022142167-appb-000018
The amount of nitrous oxide emissions produced for a given mass of biomass;
所述薪材燃烧抵消的碳排放Coffset combustion计算公式为： The calculation formula for carbon emissions offset by the fuelwood combustion Coffset combustion is:
Coffset combustion＝12m combution×Coxi mulberry×LHV mulberry Coffset combustion = 12m combustion × Coxi mulberry × LHV mulberry
×EF nGas/(LHV nGas×44) ×EF nGas /(LHV nGas ×44)
其中，Coxi mulberry为桑枝生物质燃烧的氧化率，LHV mulberry桑枝的低位发热值，EF nGas为天然气的碳排放系数，LHV nGas天然气的低位发热值； Among them, Coxi mulberry is the oxidation rate of mulberry branch biomass combustion, the low heating value of LHV mulberry mulberry branches, EF nGas is the carbon emission coefficient of natural gas, and LHV nGas is the low heating value of natural gas;
生物燃烧净固碳量C′ 11计算公式为： The calculation formula for the net carbon sequestration of biological combustion C′ 11 is:
Figure PCTCN2022142167-appb-000019
Figure PCTCN2022142167-appb-000019
其中，C hranch是桑枝的含碳量，Coffset combustion为薪材燃烧抵消的碳排放。 Among them, C hranch is the carbon content of mulberry branches, and Coffset combustion is the carbon emissions offset by the combustion of fuelwood.
步骤S102：根据用于桑园原地堆肥的伐桑桑叶的总生物质量以及堆肥桑叶的权重因子求出桑叶堆肥的碳残留量，基于所述碳残留量减去非二氧化碳温室气体排放量，计算得出桑叶堆肥固碳量；Step S102: Calculate the carbon residue of the mulberry leaf compost based on the total biomass of the harvested mulberry leaves used for in-situ composting in the mulberry garden and the weight factor of the composted mulberry leaves, and subtract non-carbon dioxide greenhouse gas emissions based on the carbon residue. The amount of carbon sequestered by mulberry leaf compost is calculated;
对原地堆肥的桑树桑叶固碳计算，用于堆肥的总生物质量m compost为： Calculating the carbon sequestration of mulberry leaves composted in situ, the total biomass m compost used for compost is:
Figure PCTCN2022142167-appb-000020
Figure PCTCN2022142167-appb-000020
其中，λ leaf,i为第i个品种桑树伐桑时每株桑树上所伐桑叶的重量，w leaf,i为第i个品种桑树桑叶的含水量； Among them, λ leaf,i is the weight of the mulberry leaves cut on each mulberry tree when cutting mulberry trees of the i-th variety, w leaf,i is the moisture content of the mulberry leaves of the i-th variety mulberry tree;
参照森林凋落叶的碳损失或质量损失来确立桑叶原地堆肥的模型。假设桑叶原地堆肥第i年的碳损失率为c i，前四年碳损失率较大，依次递减，到桑叶原地堆肥四年后，桑叶中可溶性碳(DOC)，主要包括一些小分子的糖类、有机酸、氨基酸及肽类已大部分在微生物的作用下分解，含量较低，且趋于稳定。同时微生物代谢产物和残体在桑叶分解过程中形成相对稳定的腐殖质。桑叶分解后期的难降解物质构成腐殖质前体物质。凋落叶的腐殖化过程与分解伴随发生。在四年后 成形的土壤腐殖质年矿化率基本稳定，设为γ； The model of in-situ composting of mulberry leaves was established with reference to the carbon loss or mass loss of forest litter. Assume that the carbon loss rate c i of the i-th year of in-situ composting of mulberry leaves is c i . The carbon loss rate is larger in the first four years and decreases successively. After four years of in-situ composting of mulberry leaves, the soluble carbon (DOC) in the mulberry leaves mainly includes Some small-molecule sugars, organic acids, amino acids and peptides have been mostly decomposed by microorganisms, and their contents are low and tend to be stable. At the same time, microbial metabolites and residues form relatively stable humus during the decomposition of mulberry leaves. The refractory substances in the late decomposition stage of mulberry leaves constitute humus precursor substances. The humification process of leaf litter occurs concomitantly with decomposition. The annual mineralization rate of soil humus formed after four years is basically stable, which is set to γ;
根据PSA2050：2011，产品100年评价期内如是缓慢释放二氧化碳，则应用释放的总碳量计算时应将原始碳量乘以一个权重因子，该权重因子的计算公式为
Figure PCTCN2022142167-appb-000021
则对于堆肥的桑叶来说，其权重因子为： According to PSA2050:2011, if a product slowly releases carbon dioxide during the 100-year evaluation period, the original carbon amount should be multiplied by a weighting factor when calculating the total carbon released. The calculation formula of the weighting factor is:
Figure PCTCN2022142167-appb-000021
Then for composted mulberry leaves, the weight factor is:
Figure PCTCN2022142167-appb-000022
Figure PCTCN2022142167-appb-000022
其中，c i为桑叶堆肥第i年的碳损失率，γ为四年后成型土壤腐殖质年矿化率； Among them, c i is the carbon loss rate of mulberry leaf compost in the i-th year, and γ is the annual mineralization rate of soil humus after four years;
基于堆肥的桑叶，总碳残留量减去非二氧化碳温室气体排放，得净固碳量C′ 12计算公式为： Based on composted mulberry leaves, the total carbon residue minus non-carbon dioxide greenhouse gas emissions can be calculated by the calculation formula of net carbon sequestration C′ 12 :
Figure PCTCN2022142167-appb-000023
Figure PCTCN2022142167-appb-000023
其中，FW compost为堆肥桑叶的权重因子，C leaf桑叶含碳量，
Figure PCTCN2022142167-appb-000024
为一定质量的生物质堆肥过程产生的甲烷排放量，
Figure PCTCN2022142167-appb-000025
为一定质量的生物质堆肥过程产生的甲烷排放量。 Among them, FW compost is the weighting factor of composted mulberry leaves, C leaf contains carbon,
Figure PCTCN2022142167-appb-000024
The amount of methane emissions produced by a certain mass of biomass composting process,
Figure PCTCN2022142167-appb-000025
The amount of methane emissions produced by the composting process for a given mass of biomass.
步骤S103：利用鲜茧产量，以及鲜茧的蚕丝纤维出丝率，求出蚕丝纤维初始净碳量，基于蚕丝纤维产品在使用寿命终结时一次性释放存储碳的权重因子计算得蚕丝纤维固碳量；Step S103: Use the yield of fresh cocoons and the silk fiber yield rate of fresh cocoons to calculate the initial net carbon amount of silk fiber. Calculate the carbon sequestration of silk fiber based on the weight factor of the silk fiber product's one-time release of stored carbon at the end of its service life. quantity;
桑叶喂给蚕，蚕结茧，茧缫丝后变成蚕蛹、生丝、长吐、蛹衬、疵茧绵，后四类统称为蚕丝纤维。生丝可以制成服装、领带、丝巾等丝制品，长吐、蛹衬、疵茧绵可以再加工成绢丝线制成丝绸制品或直接加工成蚕丝被。这些丝绸制品都有一定的使用年限，存储在其中的碳是在各类丝绸产品后使用寿命终结时经过焚烧、填埋等手段处理一次性完成碳释放。对于一定面积的桑园来说，若其鲜茧产量为m cocoon，鲜茧的蚕丝纤维产丝率为β。则蚕丝纤维中初始净碳量为 Mulberry leaves are fed to silkworms, who spin cocoons. The cocoons are reeled and turned into silkworm pupae, raw silk, spun silk, pupa lining, and defective cocoon cotton. The latter four categories are collectively called silk fibers. Raw silk can be made into silk products such as clothing, ties, scarves, etc. Long silk, cocoon lining, and defective cocoon cotton can be reprocessed into silk thread to make silk products or directly processed into silk quilts. These silk products have a certain service life, and the carbon stored in them is released at one time through incineration, landfill and other means at the end of the service life of various silk products. For a mulberry orchard of a certain area, if its fresh cocoon output is m cocoon , the silk fiber production rate of fresh cocoons is β. Then the initial net carbon content in silk fiber is
C 21＝m cocoon×β×(1-w fiber)×C fiber    (1) C 21 =m cocoon ×β×(1-w fiber )×C fiber (1)
其中，m cocoon为鲜茧产量，β为鲜茧的蚕丝纤维产丝率，w fiber为 蚕丝纤维的含水率，C fiber为蚕丝纤维中的碳含量； Among them, m cocoon is the yield of fresh cocoons, β is the silk fiber production rate of fresh cocoons, w fiber is the moisture content of silk fibers, and C fiber is the carbon content in silk fibers;
所述蚕丝纤维在100年评价期内的权重因子FW fiber计算公式为： The calculation formula of the weight factor FW fiber of the silk fiber within the 100-year evaluation period is:
FW fiber＝1-0.76t 0/100     (2) FW fiber ＝1-0.76t 0 /100 (2)
其中，t 0为生丝、蛹衬、长吐做成各类丝绸产品后使用寿命。 Among them, t 0 is the service life after raw silk, pupa lining and long silk are made into various silk products.
对桑叶中碳流向蚕丝纤维的固碳计算，根据公式(1)和公式(2)可得蚕丝纤维在100年评价周期内的净固碳量C′ 21计算公式为： To calculate the carbon sequestration of carbon in mulberry leaves flowing to silk fibers, according to formula (1) and formula (2), the net carbon sequestration amount C′ 21 of silk fiber in the 100-year evaluation period can be calculated as:
C′ 21＝C 21×(1-FW fiber) C′ 21 =C 21 ×(1-FW fiber )
＝m cocoon×β×(1-w fiber)×C fiber×(0.76t 0/100)。 =m cocoon ×β×(1-w fiber )×C fiber ×(0.76t 0 /100).
步骤S104：基于蚕蛹中碳含量计算得蚕蛹固碳量；Step S104: Calculate the amount of carbon fixed by silkworm pupae based on the carbon content in the silkworm pupae;
蚕蛹中碳含量较高，蚕蛹一般是用作鱼类或禽类饲料添加剂，或用于鱼饵产品。从蚕蛹形成到缫丝制成各类饲料产品到使用的平均时间为，蚕蛹作为饲料经消化成排泄物排出，这时如果排泄物再经堆肥加工成有机肥仍可实现进一步的固碳；Silkworm pupae have a high carbon content and are generally used as fish or poultry feed additives or in fish bait products. The average time from the formation of silkworm chrysalis to the reeling of silk into various feed products and use is. The silkworm chrysalis is digested as feed and discharged into excrement. At this time, if the excrement is processed into organic fertilizer through composting, further carbon sequestration can still be achieved;
对桑叶中碳流向蚕蛹的固碳计算，则蚕蛹中净固碳量C′ 22计算公式为： To calculate the carbon sequestration from the carbon in the mulberry leaves to the silkworm pupae, the calculation formula for the net carbon sequestration C′ 22 in the silkworm pupae is:
C′ 22＝m cocoon×α×(1-w pupa)×C pupa×(0.76t pupa/100) C′ 22 =m cocoon ×α×(1-w pupa )×C pupa ×(0.76t pupa /100)
其中，α为鲜茧产出蚕蛹的百分比，w pupa为缫丝后作为副产品售卖的蚕蛹中的含水量，C pupa为蚕蛹中的碳含量，t pupa为固碳时长。 Among them, α is the percentage of silkworm pupae produced from fresh cocoons, w pupa is the water content in silkworm pupae sold as by-products after reeling, C pupa is the carbon content in silkworm pupae, and t pupa is the carbon fixation time.
步骤S105：利用蚕砂与食剩叶的总生物质量计算得蚕砂、食剩叶堆肥后的固碳量；Step S105: Calculate the amount of carbon sequestration after composting silkworm excrement and leftover leaves using the total biomass of silkworm excrement and leftover leaves;
蚕砂、食剩叶都是通过可控制温湿度的小型堆肥设备进行快速堆肥，也可以采用桑园内深埋堆肥。蚕砂与食剩叶的总生物质量无法称量，可以通过总桑叶量减去蚕茧的干物质量，再去除掉蚕生命活动消耗掉的桑叶量m leafConsum。蚕生命活动将部分桑叶消耗变成二氧化碳以呼吸的形式排出体外。总供叶量可以通过桑园的年鲜茧产量进行估算，一般来说每1公斤鲜茧需要消耗桑叶14公斤，若不同品种桑叶的平均含水量为
Figure PCTCN2022142167-appb-000026
则总供叶量为
Figure PCTCN2022142167-appb-000027
所以蚕砂与食剩叶的总生物质量m leftover为： Silkworm pellets and leftover leaves are quickly composted through small composting equipment that can control temperature and humidity, or deep burial compost can be used in the mulberry garden. The total biological mass of silkworm excrement and leftover leaves cannot be weighed. The dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the amount of mulberry leaves consumed by silkworms' life activities, m leafConsum , can be removed. The life activities of silkworms convert part of the mulberry leaves consumed into carbon dioxide and excrete it out of the body in the form of respiration. The total leaf supply can be estimated from the annual fresh cocoon production of the mulberry orchard. Generally speaking, 14 kilograms of mulberry leaves are consumed for every 1 kilogram of fresh cocoons. If the average moisture content of different varieties of mulberry leaves is
Figure PCTCN2022142167-appb-000026
Then the total leaf supply is
Figure PCTCN2022142167-appb-000027
Therefore, the total biological mass m leftover of silkworm excrement and leftover leaves is:
Figure PCTCN2022142167-appb-000028
Figure PCTCN2022142167-appb-000028
其中，θ为鲜茧烘茧时鲜茧量与烘出的干茧量的质量比，
Figure PCTCN2022142167-appb-000029
为不同品种桑叶的平均含水量，W dryCocoon为干茧中的水份，m leafConsum为蚕生命活动消耗掉的桑叶量； Among them, θ is the mass ratio of the amount of fresh cocoons to the amount of dried cocoons when drying fresh cocoons,
Figure PCTCN2022142167-appb-000029
is the average moisture content of mulberry leaves of different varieties, W dryCocoon is the moisture in dry cocoons, m leafConsum is the amount of mulberry leaves consumed by silkworms’ life activities;
对蚕砂、食剩叶的固碳计算，由于蚕砂与食剩叶中组分比无法确定，这部分生物质中含碳量也无法获得，可以通过总供给桑叶中净碳量减去减去蚕丝纤维中的碳量、蚕蛹的碳量以及蚕呼吸的二氧化碳中的碳量，蚕砂、食剩叶中的初始净碳量C 23计算公式为： For the calculation of carbon sequestration in silkworm excrement and leftover leaves, since the component ratio of silkworm excrement and leftover leaves cannot be determined, the carbon content in this part of the biomass cannot be obtained. It can be subtracted from the net carbon in the total supply of mulberry leaves. Subtracting the carbon amount in silk fiber, the carbon amount in silkworm pupae and the carbon amount in carbon dioxide breathed by silkworms, the initial net carbon amount C 23 in silkworm excrement and food leftover leaves is calculated as follows:
Figure PCTCN2022142167-appb-000030
Figure PCTCN2022142167-appb-000030
则蚕砂、食剩叶中固碳量C′ 23计算公式为： Then the calculation formula for carbon sequestration C′ 23 in silkworm excrement and leftover leaves is:
Figure PCTCN2022142167-appb-000031
Figure PCTCN2022142167-appb-000031
其中，C 23为为蚕砂与食剩叶中的初始净碳量，FW compost为堆肥过程中的碳残留率，m leftover为蚕砂与食剩叶的总生物质量。 Among them, C 23 is the initial net carbon amount in silkworm excrement and leftover leaves, FW compost is the carbon residual rate in the composting process, and m leftover is the total biomass of silkworm excrement and leftover leaves.
步骤S106：利用所述桑果生物质量计算得桑果的固碳量C′ 3； Step S106: Calculate the carbon sequestration amount C′ 3 of the mulberry fruit using the biomass of the mulberry fruit;
桑果从形成到售卖消费周期是相当短的，所以这部分光合作用形成的二氧化碳基本都回归空气，因此所述固碳量C′ 3＝0。 The cycle from formation to sale and consumption of mulberries is quite short, so the carbon dioxide formed during photosynthesis basically returns to the air, so the carbon sequestration amount C′ 3 =0.
步骤S107：利用地下年生物质增长量与地上生物质增长量的比例计算得地下生物质的固碳量；Step S107: Calculate the carbon sequestration amount of underground biomass using the ratio of annual underground biomass growth to above-ground biomass growth;
地下生物质的增长与地上生物质的增长成正比，比例关系主要由种植地气候及土壤特性决定，所述地下生物质的固碳量C′ 4计算公式为： The growth of underground biomass is directly proportional to the growth of above-ground biomass. The proportional relationship is mainly determined by the climate and soil characteristics of the planting site. The carbon sequestration amount C′ 4 of the underground biomass is calculated by:
Figure PCTCN2022142167-appb-000032
Figure PCTCN2022142167-appb-000032
其中，τ为地下年生物质增长量与地上生物质增长量的比例，C root为地 下生物质量的含碳量，m fruit为桑果的干物质量。 Among them, τ is the ratio of annual underground biomass growth to above-ground biomass growth, C root is the carbon content of underground biomass, and m fruit is the dry matter mass of mulberries.
步骤S108：将上述固碳量合并计算，得到最终桑园固碳量；Step S108: Calculate the above carbon sequestration amounts together to obtain the final carbon sequestration amount of the mulberry orchard;
C′ 0＝(C′ 11+C′ 12+C′ 21+C′ 22+C′ 23+C′ 3+C′ 4)×44/12。 C′ 0 = (C′ 11 +C′ 12 +C′ 21 +C′ 22 +C′ 23 +C′ 3 +C′ 4 )×44/12.
本实施例所提供的一种桑园生态系统固碳核算的建模方法，通过构建桑园固碳量计算系统分析了用于养蚕的桑园生态系统中光合作用产生的碳的七条流通途径，分别对所述七条流通途径中的固碳量进行计算，通过追踪碳循环过程中的损失量，对桑枝薪材燃烧、桑叶堆肥、桑叶生物体碳转化、丝绸产品的使用终期废弃等带来的二氧化碳最终释放或逃逸进行的详细计算，建立了一系列桑园生态系统固碳量核算的模型，对桑园固碳科学、公正评价具有重要意义。This embodiment provides a modeling method for carbon sequestration accounting in mulberry orchard ecosystems. By constructing a mulberry orchard carbon sequestration calculation system, the seven circulation pathways of carbon produced by photosynthesis in the mulberry orchard ecosystem for sericulture are analyzed. , calculate the amount of carbon sequestered in the seven circulation pathways respectively, and by tracking the loss during the carbon cycle, we can analyze the burning of mulberry branch firewood, composting of mulberry leaves, carbon conversion of mulberry leaf organisms, and the end-of-use of silk products. Detailed calculations of the final release or escape of carbon dioxide caused by waste, etc. have established a series of accounting models for carbon sequestration in mulberry orchard ecosystems, which is of great significance to the scientific and fair evaluation of carbon sequestration in mulberry orchards.
基于上述实施例，本实施例采用桑园面积300亩，一年伐桑的次数是N＝2，桑园的桑树品种数是n＝3，其中杂交桑40亩，果桑35亩，稼接桑225亩的实验数据验证本发明的方法步骤，请参考表1伐桑中碳净量的计算参数列表和图2桑园光合作用碳循环示意图，具体如下所示：Based on the above embodiment, this embodiment uses a mulberry orchard area of 300 acres, the number of mulberry cuttings per year is N=2, and the number of mulberry tree varieties in the mulberry orchard is n=3, of which 40 acres are hybrid mulberries, 35 acres are fruit mulberries, and crop grafting is The experimental data of 225 acres of mulberries verify the method steps of the present invention. Please refer to Table 1 for the calculation parameter list of the net carbon amount in mulberry harvesting and Figure 2 for the schematic diagram of the carbon cycle of photosynthesis in the mulberry garden. The details are as follows:
表1伐桑中碳净量的计算参数列表Table 1 List of parameters for calculating the net carbon content in Vasan
Figure PCTCN2022142167-appb-000033
Figure PCTCN2022142167-appb-000033
该桑园一年伐两次桑，桑条用作薪材燃烧，对作为生物质燃烧的固碳计算，得用于薪材燃烧的总干物质量为228.23t。The mulberry orchard is cut twice a year, and the mulberry strips are used for fuelwood burning. Calculation of carbon sequestration as biomass burning shows that the total dry matter mass used for fuelwood burning is 228.23t.
据IPCC2006国家清单指南推荐的缺省值，如果采用传统灶，燃烧时产生的甲烷和氧化亚氮排放量分别为2.4，和0.08g/kg燃料。According to the default values recommended by the IPCC 2006 National Inventory Guidelines, if a traditional stove is used, the methane and nitrous oxide emissions produced during combustion are 2.4 and 0.08 g/kg fuel respectively.
农户采用桑枝作为薪材燃烧，主要是用于炊煮。薪材燃烧则相应的减少了天然气的使用。可以考虑这部分产生的碳抵销。根据《中国能源统计年鉴2017》数据可得天燃气的低位发热值LHV nGas为 38.931MJ/m3，查询生物质成份数据库phyllis database中柳树的低位发热值NTV mulberry为18.11MJ/kg，桑枝燃烧可采用柳树燃烧的低位发热值。天燃气的碳排放系数为2.47kgCO2e/kg，生物质燃烧的氧化率0.9。则可算得薪材燃烧可抵销的碳排放为64.366吨碳当量，记作64.366tCE，即所述生物燃烧净固碳量C′ 11为70.386tCE。 Farmers burn mulberry branches as firewood, mainly for cooking. Firewood combustion reduces the use of natural gas accordingly. The carbon offset generated by this part can be considered. According to the data of "China Energy Statistical Yearbook 2017", the low heating value LHV nGas of natural gas is 38.931MJ/m3. The low heating value NTV mulberry of willow in the biomass component database phyllis database is 18.11MJ/kg. The burning of mulberry branches can Adopts the low heating value of willow burning. The carbon emission coefficient of natural gas is 2.47kgCO2e/kg, and the oxidation rate of biomass combustion is 0.9. Then it can be calculated that the carbon emissions that can be offset by fuelwood combustion are 64.366 tons of carbon equivalent, recorded as 64.366tCE, that is, the net carbon sequestration amount C′ 11 of biological combustion is 70.386tCE.
用于堆肥的一般都是桑叶，根据表1可算得总生物质量为158.514t桑叶。Mulberry leaves are generally used for composting. According to Table 1, the total biomass can be calculated to be 158.514t mulberry leaves.
参照森林凋落叶的碳损失或质量损失来确立桑叶原地堆肥的模型。假设桑叶原地堆肥前四年的第i年的碳损失率为c i依次为47％，17.5％，7.1％，2.4％。前四年碳损失率较大，依次递减，到桑叶原地堆肥四年后，桑叶中可溶性碳(DOC)，主要包括一些小分子的糖类、有机酸、氨基酸及肽类已大部分在微生物的作用下分解，含量较低，且趋于稳定。同时微生物代谢产物和残体在桑叶分解过程中形成相对稳定的腐殖质。桑叶分解后期的难降解物质构成腐殖质前体物质。在四年后成形的土壤腐殖质年矿化率基本稳定为γ＝1％； The model of in-situ composting of mulberry leaves was established with reference to the carbon loss or mass loss of forest litter. Assume that the carbon loss rate c i in the i-th year before four years of in-situ composting of mulberry leaves is 47%, 17.5%, 7.1%, and 2.4%. The carbon loss rate was relatively large in the first four years and then decreased. Four years after the mulberry leaves were composted in situ, most of the soluble carbon (DOC) in the mulberry leaves, including some small-molecule sugars, organic acids, amino acids and peptides, had been Decomposed under the action of microorganisms, the content is low and tends to be stable. At the same time, microbial metabolites and residues form relatively stable humus during the decomposition of mulberry leaves. The refractory substances in the late decomposition stage of mulberry leaves constitute humus precursor substances. The annual mineralization rate of soil humus formed after four years is basically stable at γ = 1%;
计算得100年评价期内桑叶原地堆肥的碳残留量为13.301tCE。根据蔬菜废弃物与小麦秸秆堆肥的非二氧化碳温室气体排放测定值，本实例中甲烷和氧化亚氮的排放分别为0.4085、0.1618g/kg干堆肥原料，即可得所述桑叶堆肥固碳量C′ 12为10.776tCE。 The calculated carbon residue of mulberry leaves in situ compost during the 100-year evaluation period is 13.301tCE. According to the measured non-carbon dioxide greenhouse gas emissions of vegetable waste and wheat straw compost, the emissions of methane and nitrous oxide in this example are 0.4085 and 0.1618g/kg of dry compost raw material respectively, and the carbon sequestration amount of the mulberry leaf compost can be obtained C′ 12 is 10.776tCE.
桑叶喂给蚕，蚕结茧，茧缫丝后变成蚕蛹、生丝、长吐、蛹衬、疵茧绵，后四类统称为蚕丝纤维。生丝可以制成服装、领带、丝巾等丝制品，长吐、蛹衬、疵茧绵可以再加工成绢丝线制成丝绸制品或直接加工成蚕丝被。这些丝绸制品都有一定的使用年限，存储在其中的碳是在各类丝绸产品后使用寿命终结时经过焚烧、填埋等手段处理一次性完成碳释放。该蚕桑基地2020年全年鲜茧产量为21625kg，鲜茧的蚕丝纤维产丝率为16.29％，蚕丝纤维的含水率9.91％，蚕丝纤维中的碳含量38％，假定生丝、蛹衬、长吐做成各类丝绸产品后使用寿命15年。即可算得蚕丝纤维在100年评价周期内的固碳量C′ 21为0.1375tCE。 Mulberry leaves are fed to silkworms, who spin cocoons. The cocoons are reeled and turned into silkworm pupae, raw silk, spun silk, pupa lining, and defective cocoon cotton. The latter four categories are collectively called silk fibers. Raw silk can be made into silk products such as clothing, ties, scarves, etc. Long silk, cocoon lining, and defective cocoon cotton can be reprocessed into silk thread to make silk products or directly processed into silk quilts. These silk products have a certain service life, and the carbon stored in them is released at one time through incineration, landfill and other means at the end of the service life of various silk products. The sericulture base's annual fresh cocoon output in 2020 is 21,625kg. The silk fiber production rate of fresh cocoons is 16.29%, the moisture content of silk fiber is 9.91%, and the carbon content in silk fiber is 38%. It is assumed that raw silk, pupa lining, and long spit After being made into various silk products, the service life is 15 years. It can be calculated that the carbon sequestration amount C′ 21 of silk fiber in the 100-year evaluation period is 0.1375tCE.
蚕蛹中碳含量较高，蚕蛹一般是用作鱼类或禽类饲料添加剂，或用于鱼饵产品。从蚕蛹形成到缫丝制成各类饲料产品到使用的平均时间为2年，蚕蛹作为饲料经消化成排泄物排出，这时如果排泄物再经堆肥加工成有机肥仍可实现进一步的固碳。本实例中不考虑消化后的碳残留，仅考虑2年后成为饲料时进行一次性碳排放，蚕蛹中的碳含量54.5％，含水率为9.91％，鲜茧产出蚕蛹的百分比为19.916％，即可算得蚕蛹中的固碳量C′ 22为0.032tCE。 Silkworm pupae have a high carbon content and are generally used as fish or poultry feed additives or in fish bait products. The average time from the formation of silkworm chrysalis to the reeling of silk into various feed products and their use is 2 years. Silkworm chrysalises are digested as feed and discharged into excrement. At this time, if the excrement is composted and processed into organic fertilizer, further carbon sequestration can still be achieved. . In this example, the carbon residue after digestion is not considered, and only the one-time carbon emission when it becomes feed after 2 years is considered. The carbon content in silkworm pupae is 54.5%, the moisture content is 9.91%, and the percentage of silkworm pupae produced from fresh cocoons is 19.916%. It can be calculated that the carbon fixation amount C′ 22 in silkworm pupae is 0.032tCE.
蚕砂、食剩叶都是通过可控制温湿度的小型堆肥设备进行快速堆肥，也可以采用桑园内深埋堆肥。蚕砂与食剩叶的总生物质量无法称量，可以通过总桑叶量减去蚕茧的干物质量，再去除掉蚕生命活动消耗掉的桑叶量。蚕生命活动将部分桑叶消耗变成二氧化碳以呼吸的形式排出体外。总供叶量可以通过桑园的年鲜茧产量进行估算，一般来说每1公斤鲜茧需要消耗桑叶14公斤，若不同品种桑叶的平均含水量为73.75％，总鲜茧产量为21.625吨，鲜茧烘茧时鲜茧量与烘出的干茧量的质量比2.74，但是烘茧后，干茧并非烘至全无水份，同时干茧仍会吸收空气的水份达到水份平衡，此时干茧中的水份为9.91％。即可算得蚕砂与食剩叶的总干物质量为76.742t，可算得蚕砂、食剩叶中的净碳量为35.209tCE，最终可算得所述蚕砂、食剩叶的固碳量C′ 23为5.207tCE。 Silkworm pellets and leftover leaves are quickly composted through small composting equipment that can control temperature and humidity, or deep burial compost can be used in the mulberry garden. The total biological mass of silkworm excrement and leftover leaves cannot be weighed. The dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the amount of mulberry leaves consumed by silkworms' life activities can be removed. The life activities of silkworms convert part of the mulberry leaves consumed into carbon dioxide and excrete it out of the body in the form of respiration. The total leaf supply can be estimated from the annual fresh cocoon production of the mulberry garden. Generally speaking, 14 kilograms of mulberry leaves are consumed for every 1 kilogram of fresh cocoons. If the average moisture content of different varieties of mulberry leaves is 73.75%, the total fresh cocoon production is 21.625 tons. When drying fresh cocoons, the mass ratio of the amount of fresh cocoons to the amount of dried cocoons is 2.74. However, after drying, the dry cocoons are not dried until they are completely free of moisture. At the same time, the dry cocoons will still absorb moisture from the air to achieve a moisture balance. , the moisture content in the dry cocoon at this time is 9.91%. It can be calculated that the total dry matter mass of silkworm excrement and leftover leaves is 76.742t, and the net carbon amount in silkworm excrement and leftover leaves can be calculated to be 35.209tCE. Finally, the carbon sequestration amount C of silkworm excrement and leftover leaves can be calculated. ′ 23 is 5.207tCE.
所述桑果在光合作用形成的二氧化碳基本都回归空气，故所述桑果中的固碳量C′ 3为0。 The carbon dioxide formed by the photosynthesis of the mulberry fruit basically returns to the air, so the amount of carbon fixed in the mulberry fruit C′ 3 is 0.
根据《2006年IPCC国家温室气体清单指南》，因浙江属于亚热带气候，因此可确定桑树的地下部生物量与地上部生物量比例为0.23，地下生物质量的含碳量为采用IPCC默认值0.5，则可算得地下固碳量C′ 4为55.121tCE。 According to the "2006 IPCC National Greenhouse Gas Inventory Guidelines", since Zhejiang has a subtropical climate, it can be determined that the ratio of underground biomass to above-ground biomass of mulberry trees is 0.23, and the carbon content of underground biomass is the IPCC default value of 0.5. Then the underground carbon sequestration amount C′ 4 can be calculated to be 55.121tCE.
综合以上七个部分的计算结果，可以得到整个桑园2020年的总固碳量为141.66tCE，合计519.418tCO2e，换算成每公倾每年的固碳量则为25.97tCO2e/ha/year。Combining the calculation results of the above seven parts, it can be obtained that the total carbon sequestration amount of the entire mulberry garden in 2020 is 141.66tCE, totaling 519.418tCO2e. When converted into carbon sequestration per hectare per year, it is 25.97tCO2e/ha/year.
本实施例所提供的一种桑园生态系统固碳核算的建模方法，建立 桑园生态系统的固碳计算模型将桑园生态系统的固碳分成了七个部分，七条路径，并对这七途径中的碳在100年评价期内的固碳计算进行了数据分析，得到了整个桑园生态系统的固碳量数据，解决了目前固碳计算利用经验公式，粗略误差大的问题，明确各部分碳释放情况，实现了桑园固碳的精确化检测。This embodiment provides a modeling method for accounting for carbon sequestration in a mulberry garden ecosystem. It establishes a carbon sequestration calculation model for the mulberry garden ecosystem and divides the carbon sequestration of the mulberry garden ecosystem into seven parts and seven paths. Data analysis was conducted on the carbon sequestration calculation of carbon in the seven pathways during the 100-year evaluation period, and the carbon sequestration data of the entire mulberry ecosystem was obtained. This solved the problem of large rough errors in current carbon sequestration calculations using empirical formulas, and clarified The carbon release of each part enables precise detection of carbon sequestration in the mulberry garden.
本说明书中各个实施例采用递进的方式描述，每个实施例重点说明的都是与其它实施例的不同之处，各个实施例之间相同或相似部分互相参见即可。对于实施例公开的装置而言，由于其与实施例公开的方法相对应，所以描述的比较简单，相关之处参见方法部分说明即可。Each embodiment in this specification is described in a progressive manner. Each embodiment focuses on its differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other. As for the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple. For relevant details, please refer to the description in the method section.
专业人员还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。Those skilled in the art may further realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be implemented by electronic hardware, computer software, or a combination of both. In order to clearly illustrate the possible functions of hardware and software, Interchangeability, in the above description, the composition and steps of each example have been generally described according to functions. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Skilled artisans may implement the described functionality using different methods for each specific application, but such implementations should not be considered to be beyond the scope of the present invention.
以上对本发明所提供的一种桑园生态系统固碳核算的建模方法进行了详细介绍。本文中应用了具体个例对本发明的原理及实施方式进行了阐述，以上实施例的说明只是用于帮助理解本发明的方法及其核心思想。应当指出，对于本技术领域的普通技术人员来说，在不脱离本发明原理的前提下，还可以对本发明进行若干改进和修饰，这些改进和修饰也落入本发明权利要求的保护范围内。The above is a detailed introduction to a modeling method for carbon sequestration accounting in mulberry orchard ecosystems provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and the core idea of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of the claims of the present invention.

Claims (10)

  1. 一种桑园生态系统固碳核算的建模方法，其特征在于，包括：A modeling method for carbon sequestration accounting in mulberry orchard ecosystems, which is characterized by including:
    利用各桑树品种植密度和占地面积、每株伐桑量、桑枝含水率计算燃烧桑枝总生物质量，根据所述燃烧桑枝总生物质量计算得到的碳残留量，扣除燃烧时产生的非二氧化碳温室气体以及薪材燃烧实现的天然气使用的碳抵消，计算得到用于薪材燃烧的伐桑桑枝的净固碳量；The total biomass of burned mulberry branches was calculated using the planting density and floor area of each mulberry tree, the amount of mulberry cut per plant, and the moisture content of mulberry branches. The carbon residue calculated based on the total biomass of burned mulberry branches was deducted from the carbon residue produced during burning. The carbon offset of non-carbon dioxide greenhouse gases and the use of natural gas achieved by fuelwood burning is calculated to obtain the net carbon sequestration of mulberry branches used for fuelwood burning;
    根据用于桑园原地堆肥的伐桑桑叶的总生物质量以及堆肥桑叶的权重因子求出桑叶堆肥的碳残留量，基于所述碳残留量减去非二氧化碳温室气体排放量，计算得出桑叶堆肥固碳量；The carbon residue of the mulberry leaf compost is calculated based on the total biomass of the harvested mulberry leaves used for in-situ composting in the mulberry orchard and the weighting factor of the composted mulberry leaves. Based on the carbon residue minus the non-carbon dioxide greenhouse gas emissions, the calculation The carbon sequestration amount of mulberry leaf compost was obtained;
    利用鲜茧产量，以及鲜茧的蚕丝纤维出丝率，求出蚕丝纤维初始净碳量，基于蚕丝纤维产品在使用寿命终结时一次性释放存储碳的权重因子计算得蚕丝纤维固碳量；Using the yield of fresh cocoons and the silk fiber yield rate of fresh cocoons, the initial net carbon amount of silk fiber is calculated, and the carbon sequestration amount of silk fiber is calculated based on the weight factor of the silk fiber product's one-time release of stored carbon at the end of its service life;
    基于蚕蛹中碳含量计算得蚕蛹固碳量；The amount of carbon sequestered by silkworm pupae is calculated based on the carbon content in silkworm pupae;
    利用蚕砂与食剩叶的总生物质量计算蚕砂、食剩叶堆肥后的固碳量；The total biomass of silkworm excrement and leftover leaves is used to calculate the amount of carbon sequestered after composting silkworm excrement and leftover leaves;
    利用桑果生物质量计算得桑果的固碳量；The carbon sequestration amount of mulberry fruits was calculated using the biomass of mulberry fruits;
    利用地下年生物质增长量与地上生物质增长量的比例计算得地下生物质的固碳量；The carbon sequestration amount of underground biomass is calculated using the ratio of annual underground biomass growth to above-ground biomass growth;
    将所述用于薪材燃烧的伐桑桑枝的净固碳量、所述桑叶堆肥固碳量、所述蚕丝纤维固碳量、所述蚕蛹固碳量、所述蚕砂、食剩叶堆肥后的固碳量、所述桑果的固碳量和所述地下生物质的固碳量合并计算，得到最终桑园固碳量。The net carbon fixation amount of the cut mulberry branches used for fuelwood burning, the carbon fixation amount of the mulberry leaf compost, the carbon fixation amount of the silk fiber, the silkworm pupae carbon fixation amount, the silkworm excrement, and food leftovers The carbon sequestration amount of the leaves after composting, the carbon sequestration amount of the mulberry fruits and the carbon sequestration amount of the underground biomass are calculated together to obtain the final carbon sequestration amount of the mulberry orchard.
  2. 如权利要求1所述的桑园生态系统固碳核算的建模方法，其特征在于，所述利用各桑树品种植密度和占地面积、每株伐桑量、桑枝含水率计算燃烧桑枝总生物质量，根据所述燃烧桑枝总生物质量计算得到的碳残留量，扣除燃烧时产生的非二氧化碳温室气体以及薪材燃烧实现的天然气使用的碳抵消，计算得到用于薪材燃烧的伐桑桑枝的净固碳量包括：The modeling method for carbon sequestration accounting in the mulberry orchard ecosystem according to claim 1, wherein the method uses the planting density and floor area of each mulberry tree species, the amount of mulberry harvested per tree, and the moisture content of the mulberry branches to calculate the burning of mulberry branches. Total biomass, the carbon residue calculated based on the total biomass of burning mulberry branches, deducting the non-carbon dioxide greenhouse gases produced during combustion and the carbon offset of natural gas used for fuelwood burning, is calculated to calculate the amount of felling used for fuelwood burning. The net carbon sequestration of mulberry branches includes:
    对用作薪材燃烧的生物质碳的追踪，计算燃烧总生物质量m combustion，其计算公式为： To track the biomass carbon used for fuelwood combustion, calculate the total biomass burned m combustion , the calculation formula is:
    Figure PCTCN2022142167-appb-100001
    Figure PCTCN2022142167-appb-100001
    其中，N为一年伐桑的次数，n为桑园的桑树品种数，ρ i为第i个品种的种植密度，s i为第i个品种的占地面积，λ branch,i为第i个品种桑树伐桑时每株桑树上所伐桑枝的重量，w branch,i是桑枝的含水量； Among them, N is the number of mulberry cuttings in a year, n is the number of mulberry tree varieties in the mulberry garden, ρ i is the planting density of the i-th variety, s i is the area occupied by the i-th variety, λ branch,i is the i-th variety The weight of the mulberry branches cut on each mulberry tree when cutting mulberry trees of a variety, w branch, i is the moisture content of the mulberry branches;
    基于所述燃烧总生物质量m combustion计算所述生物燃烧净固碳量C′ 11，其计算公式为： The net carbon sequestration amount C′ 11 of the biocombustion is calculated based on the total biomass m combustion , and the calculation formula is:
    Figure PCTCN2022142167-appb-100002
    Figure PCTCN2022142167-appb-100002
    其中，Coxi mulberry为生物质燃烧的氧化率，C branch是桑枝的含碳量，Coffset combustion为薪材燃烧抵消的碳排放，
    Figure PCTCN2022142167-appb-100003
    为一定质量的生物质产生的甲烷排放量，
    Figure PCTCN2022142167-appb-100004
    为一定质量的生物质产生的氧化亚氮的排放量。     Among them, Coxi mulberry is the oxidation rate of biomass combustion, C branch is the carbon content of mulberry branches, Coffset combustion is the carbon emissions offset by fuelwood burning,
    Figure PCTCN2022142167-appb-100003
    The amount of methane emissions produced by a given mass of biomass,
    Figure PCTCN2022142167-appb-100004
    The amount of nitrous oxide emissions produced for a given mass of biomass.
  3. 如权利要求2所述的桑园生态系统固碳核算的建模方法，其特征在于，所述薪材燃烧抵消的碳排放Coffset combustion计算公式为： The modeling method of carbon sequestration accounting for mulberry ecosystems according to claim 2, characterized in that the carbon emission Coffset combustion calculation formula offset by the fuelwood combustion is:
    Coffset combustion＝12m combution×Coxi mulberry×LHV mulberry Coffset combustion = 12m combustion × Coxi mulberry × LHV mulberry
    ×EF nGas/(LHV nGas×44) ×EF nGas /(LHV nGas ×44)
    其中，Coxi mulberry为桑枝生物质燃烧的氧化率，LHV mulberry为桑枝的低位发热值，EF nGas为天然气的碳排放系数，LHV nGas为天然气的低位发热值。 Among them, Coxi mulberry is the oxidation rate of mulberry branch biomass combustion, LHV mulberry is the low heating value of mulberry branches, EF nGas is the carbon emission coefficient of natural gas, and LHV nGas is the low heating value of natural gas.
  4. 如权利要求1所述的桑园生态系统固碳核算的建模方法，其特征在于，所述根据堆肥桑叶的总生物质量以及堆肥桑叶的权重因子求出桑叶堆肥的碳残留量，基于所述碳残留量减去非二氧化碳温室气体排放量，计算得出桑叶堆肥固碳量包括：The modeling method for carbon sequestration accounting in mulberry orchard ecosystems as claimed in claim 1, wherein the carbon residual amount of composted mulberry leaves is calculated based on the total biomass of composted mulberry leaves and the weight factor of composted mulberry leaves, Based on the carbon residue minus non-carbon dioxide greenhouse gas emissions, the carbon sequestration amount of mulberry leaf compost is calculated to include:
    计算堆肥的总生物质量m compost，其计算公式为： Calculate the total biomass m compost of compost, and its calculation formula is:
    Figure PCTCN2022142167-appb-100005
    Figure PCTCN2022142167-appb-100005
    其中，λ leaf,i为第i个品种桑树伐桑时每株桑树上所伐桑叶的重量，w leaf,i为第i个品种桑树桑叶的含水量； Among them, λ leaf,i is the weight of the mulberry leaves cut on each mulberry tree when cutting mulberry trees of the i-th variety, w leaf,i is the moisture content of the mulberry leaves of the i-th variety mulberry tree;
    基于堆肥的桑叶，总碳残留量减去非二氧化碳温室气体排放，得净固碳量C′ 12计算公式为： Based on composted mulberry leaves, the total carbon residue minus non-carbon dioxide greenhouse gas emissions can be calculated by the calculation formula of net carbon sequestration C′ 12 :
    Figure PCTCN2022142167-appb-100006
    Figure PCTCN2022142167-appb-100006
    其中，FW compost为堆肥桑叶的权重因子，C leaf桑叶含碳量，
    Figure PCTCN2022142167-appb-100007
    为一定质量的生物质堆肥过程产生的甲烷排放量，
    Figure PCTCN2022142167-appb-100008
    为一定质量的生物质堆肥过程产生的氧化亚氮排放量。     Among them, FW compost is the weighting factor of composted mulberry leaves, C leaf contains carbon,
    Figure PCTCN2022142167-appb-100007
    The amount of methane emissions produced by a certain mass of biomass composting process,
    Figure PCTCN2022142167-appb-100008
    The amount of nitrous oxide emissions produced by a certain mass of biomass composting process.
  5. 如权利要求4所述的桑园生态系统固碳核算的建模方法，其特征在于，所述堆肥桑叶的权重因子FW compost计算公式为： The modeling method for carbon sequestration accounting in mulberry orchard ecosystems according to claim 4, characterized in that the weight factor FW compost calculation formula of the composted mulberry leaves is:
    Figure PCTCN2022142167-appb-100009
    Figure PCTCN2022142167-appb-100009
    其中，c i为桑叶堆肥第i年的碳损失率，γ为四年后成型土壤腐殖质年矿化率。 Among them, c i is the carbon loss rate of mulberry leaf compost in the i-th year, and γ is the annual mineralization rate of soil humus after four years.
  6. 如权利要求1所述的桑园生态系统固碳核算的建模方法，其特征在于，所述利用鲜茧产量求出蚕丝纤维初始净碳量，基于蚕丝纤维的权重因子计算得蚕丝纤维固碳量包括：The modeling method for accounting for carbon sequestration in mulberry orchard ecosystems according to claim 1, characterized in that the initial net carbon amount of silk fiber is calculated using the yield of fresh cocoons, and the carbon sequestration of silk fiber is calculated based on the weight factor of silk fiber. Amount includes:
    计算蚕丝纤维中初始净碳量C 21，其计算公式为： To calculate the initial net carbon content C 21 in silk fiber, the calculation formula is:
    C 21＝m cocoon×β×(1-w fiber)×C fiber  (1) C 21 =m cocoon ×β×(1-w fiber )×C fiber (1)
    其中，m cocoon为鲜茧产量，为鲜茧的蚕丝纤维产丝率，w fiber为蚕丝纤维的含水率，C fiber为蚕丝纤维中的碳含量； Among them, m cocoon is the yield of fresh cocoons, is the silk fiber production rate of fresh cocoons, w fiber is the moisture content of silk fibers, and C fiber is the carbon content in silk fibers;
    计算蚕丝纤维在100年评价期内的权重因子FW fiber，其计算公式 为： Calculate the weight factor FW fiber of silk fiber within the 100-year evaluation period. The calculation formula is:
    FW fiber＝1-0.76t 0/100  (2) FW fiber ＝1-0.76t 0 /100 (2)
    其中，t 0为生丝、蛹衬、长吐做成各类丝绸产品后使用寿命； Among them, t 0 is the service life after raw silk, pupa lining and long spit are made into various silk products;
    基于蚕丝纤维中初始净碳量与蚕丝纤维在100年评价期内的权重因子FW fiber，计算所述蚕丝纤维固碳量C′ 21，基于公式(1)和公式(2)，其计算公式为： Based on the initial net carbon amount in the silk fiber and the weight factor FW fiber of the silk fiber within the 100-year evaluation period, the carbon fixation amount C′ 21 of the silk fiber is calculated. Based on formula (1) and formula (2), the calculation formula is: :
    C′ 21＝C 21×(1-FW fiber) C′ 21 =C 21 ×(1-FW fiber )
    ＝m cocoon×β×(1-w fiber)×C fiber×(0.76t 0/100)。 =m cocoon ×β×(1-w fiber )×C fiber ×(0.76t 0 /100).
  7. 如权利要求1所述的桑园生态系统固碳核算的建模方法，其特征在于，所述基于蚕蛹中碳含量计算得蚕蛹固碳量包括：The modeling method for carbon sequestration accounting in mulberry orchard ecosystems according to claim 1, wherein the carbon sequestration amount of silkworm pupae calculated based on the carbon content in silkworm pupae includes:
    对桑叶中碳流向蚕蛹的固碳计算，利用鲜茧产量m cocoon计算蚕蛹固碳量C′ 22，其计算公式为： To calculate the carbon sequestration of carbon in mulberry leaves flowing to silkworm pupae, the fresh cocoon yield m cocoon is used to calculate the carbon sequestration amount C′ 22 of silkworm pupae. The calculation formula is:
    C′ 22＝m cocoon×α×(1-w pupa)×C pupa×(0.76t pupa/100) C′ 22 =m cocoon ×α×(1-w pupa )×C pupa ×(0.76t pupa /100)
    其中，α为鲜茧产出蚕蛹的百分比，w pupa为缫丝后作为副产品售卖的蚕蛹中的含水量，C pupa为蚕蛹中的碳含量，t pupa为固碳时长。 Among them, α is the percentage of silkworm pupae produced from fresh cocoons, w pupa is the water content in silkworm pupae sold as by-products after reeling, C pupa is the carbon content in silkworm pupae, and t pupa is the carbon fixation time.
  8. 如权利要求1所述的桑园生态系统固碳核算的建模方法，其特征在于，所述利用蚕砂与食剩叶的总生物质量计算得蚕砂、食剩叶的固碳量包括：The modeling method for accounting for carbon sequestration in mulberry ecosystems according to claim 1, wherein the carbon sequestration amount of silkworm excrement and leftover leaves calculated using the total biomass of silkworm excrement and leftover leaves includes:
    计算蚕砂与食剩叶的总生物质量m leftover，其计算公式为： Calculate the total biological mass m leftover of silkworm excrement and leftover leaves. The calculation formula is:
    Figure PCTCN2022142167-appb-100010
    Figure PCTCN2022142167-appb-100010
    其中，θ为鲜茧烘茧时鲜茧量与烘出的干茧量的质量比，
    Figure PCTCN2022142167-appb-100011
    为不同品种桑叶的平均含水量，W dryCocoon为干茧中的水份，m leafConsum为蚕呼吸活动消耗掉的桑叶量；     Among them, θ is the mass ratio of the amount of fresh cocoons to the amount of dried cocoons when drying fresh cocoons,
    Figure PCTCN2022142167-appb-100011
    is the average moisture content of mulberry leaves of different varieties, W dryCocoon is the moisture in dry cocoons, m leafConsum is the amount of mulberry leaves consumed by silkworm respiratory activities;
    蚕砂与食剩叶一般要经过堆肥处理，再还田，由于蚕砂与食剩叶的总生物质量无法称量，可以通过总桑叶量减去蚕茧的干物质量，再去除掉蚕生命活动消耗掉的桑叶量来计算固碳量，则蚕砂、食剩叶中固碳量C′ 23计算公式为： Silkworm excrement and leftover leaves generally need to be composted and then returned to the fields. Since the total biological mass of silkworm excrement and leftover leaves cannot be weighed, the dry matter mass of silkworm cocoons can be subtracted from the total amount of mulberry leaves, and then the life activities of silkworms are removed. The carbon sequestration amount is calculated based on the amount of consumed mulberry leaves. Then the carbon sequestration amount C′ 23 in silkworm excrement and leftover leaves is calculated as follows:
    Figure PCTCN2022142167-appb-100012
    Figure PCTCN2022142167-appb-100012
    其中，C 23为蚕砂与食剩叶中的初始净碳量，FW compost为堆肥过程中的碳残留率，m leftover为蚕砂与食剩叶的总生物质量。 Among them, C 23 is the initial net carbon amount in silkworm excrement and leftover leaves, FW compost is the carbon residual rate in the composting process, and m leftover is the total biomass of silkworm excrement and leftover leaves.
  9. 如权利要求8所述的桑园生态系统固碳核算的建模方法，其特征在于，所述蚕砂与食剩叶中的初始净碳量C 23为桑园总供叶中的净碳量减去蚕丝纤维中的碳量、蚕蛹的碳量以及蚕呼吸的二氧化碳中的碳量，其计算公式为： The modeling method for carbon sequestration accounting in the mulberry orchard ecosystem according to claim 8, wherein the initial net carbon amount C 23 in the silkworm excrement and leftover leaves is the net carbon amount in the total leaves of the mulberry orchard. Subtracting the carbon amount in the silk fiber, the carbon amount in the silkworm pupa and the carbon amount in the carbon dioxide breathed by the silkworm, the calculation formula is:
    Figure PCTCN2022142167-appb-100013
    Figure PCTCN2022142167-appb-100013
    其中，C fiber蚕丝纤维中的碳含量。 Among them, the carbon content in C fiber silk fiber.
  10. 如权利要求1所述的桑园生态系统固碳核算的建模方法，其特征在于，所述利用地下年生物质增长量与地上生物质增长量的比例计算得地下生物质的固碳量，其计算公式为：The modeling method for accounting for carbon sequestration in a mulberry ecosystem as claimed in claim 1, wherein the carbon sequestration amount of underground biomass is calculated using the ratio of annual underground biomass growth to aboveground biomass growth. The calculation formula is:
    Figure PCTCN2022142167-appb-100014
    Figure PCTCN2022142167-appb-100014
    其中，τ为地下年生物质增长量与地上生物质增长量的比例，C root为地下生物质量的含碳量，m fruit为桑果的干物质量。 Among them, τ is the ratio of annual underground biomass growth to above-ground biomass growth, C root is the carbon content of underground biomass, and m fruit is the dry matter mass of mulberries.
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