CN114862179B - Modeling method for carbon sequestration accounting of mulberry field ecosystem - Google Patents

Modeling method for carbon sequestration accounting of mulberry field ecosystem Download PDF

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CN114862179B
CN114862179B CN202210467042.0A CN202210467042A CN114862179B CN 114862179 B CN114862179 B CN 114862179B CN 202210467042 A CN202210467042 A CN 202210467042A CN 114862179 B CN114862179 B CN 114862179B
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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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Abstract

The invention discloses a modeling method for carbon sequestration accounting of a mulberry field ecological system, which comprises the steps of calculating total biological mass of mulberry branches for firewood combustion by using basic planting information and mulberry field quantity data of a mulberry field so as to establish a carbon sequestration accounting model for firewood combustion by taking carbon offset and greenhouse gas emission of the combustion into consideration of a valve Sang Sangzhi; establishing a carbon release model of the Sang Sheyuan-land compost to calculate the carbon residue of the compost so as to obtain a carbon fixation accounting model of the mulberry leaves; establishing a carbon fixation quantity model of silk fibers and silkworm chrysalis in a 100-year evaluation period; establishing a silkworm excrement and residual leaf carbon fixation accounting model considering composting greenhouse gas emission and silkworm respiratory emission carbon dioxide; establishing seven carbon circulation paths modeling such as a mulberry and underground biomass carbon fixation accounting model. The invention respectively models the carbon loss and carbon offset of seven circulation paths of photosynthetic carbon, explores a precise and reliable mulberry field carbon fixation accounting model, and has important significance for quantitative evaluation of the carbon fixation expansion of the mulberry field.

Description

Modeling method for carbon sequestration accounting of mulberry field ecosystem
Technical Field
The invention relates to the technical field of environmental evaluation, in particular to a modeling method for carbon sequestration accounting of a mulberry field ecological system.
Background
Global warming, which has been a serious threat to natural environment and human economic development in recent years, is mainly due to the emission of a large amount of greenhouse gases (GHG), including carbon dioxide, methane, and nitrogen oxides, etc., caused by human production activities. Greenhouse gas emissions can be measured in terms of a carbon footprint, which refers to the total amount of greenhouse gas emissions and scavengers generated at all stages of the product lifecycle, expressed in terms of carbon dioxide equivalents (CO 2-eq). And the carbon footprint detection of the product can provide data reference for the low-carbon production of energy conservation and emission reduction of enterprises.
The textile industry always belongs to the industry with high energy consumption and high carbon emission, the greenhouse gas emission in the production and use stage accounts for 3% of the global greenhouse gas emission, 63% of fibers in the textile industry are derived from petrochemical products, a large amount of greenhouse gas emission can be generated, the cotton fibers in the remaining 37% of fibers account for 24%, a large amount of water resources are required for cotton planting, and a large amount of fertilizers, pesticides and the like used in the planting process can cause great burden to the environment. The silk fiber should avoid pesticide during the mulberry planting process as much as possible, so the load on the environment is relatively small.
However, in the prior art, only carbon absorbed by photosynthesis is calculated with respect to carbon fixation amount generated in the mulberry planting process, release and loss of carbon in the mulberry field ecological system are not considered, a calculation mode for carbon circulation release and loss in the mulberry field ecological system is lacking in the prior art, and no effective data is available for proving the environmental protection and sustainable characteristics of silk fibers. Therefore, a modeling method for the carbon sequestration accounting of the mulberry field ecological system needs to be designed, and the problem that a scientific and reliable detection method for the carbon sequestration amount of the mulberry field in the prior art is not available is solved.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to solve the problem that no scientific and reliable accounting method is available for the carbon fixation amount of the mulberry field in the prior art.
In order to solve the technical problems, the invention provides a modeling method for carbon sequestration accounting of a mulberry field ecological system, which comprises the following steps:
calculating total biomass of the burning mulberry branches by using the planting density and the occupied area of each mulberry variety, the mulberry quantity of each plant and the water content of the mulberry branches, deducting carbon offset of non-carbon dioxide greenhouse gas generated during burning and natural gas used by firewood burning according to the carbon residue obtained by calculating the total biomass of the burning mulberry branches, and calculating to obtain net carbon fixation quantity of the valve Sang Sangzhi used for firewood burning;
according to the total biological mass of the mulberry leaves and the weight factors of the composting mulberry leaves, the carbon residue of the mulberry leaf compost is calculated, and the carbon fixation amount of the mulberry leaf compost is calculated based on the carbon residue minus the non-carbon dioxide greenhouse gas emission;
calculating the initial net carbon content of the silk fiber by utilizing the fresh cocoon yield and the silk fiber yield of the fresh cocoons, and calculating the carbon fixation content of the silk fiber based on the weight factor of releasing the storage carbon at one time when the service life of the silk fiber product is finished;
calculating the carbon fixation amount of the silkworm chrysalis based on the carbon content in the silkworm chrysalis;
calculating the carbon fixation amount of the silkworm excrement and the residual leaf compost by using the total biological mass of the silkworm excrement and the residual leaf;
calculating the carbon sequestration amount of the mulberries by utilizing the biomass amount of the mulberries;
calculating the carbon sequestration amount of the underground biomass by utilizing the ratio of the biomass increment of the underground year to the biomass increment of the overground;
and combining and calculating the net carbon fixation amount of the valve Sang Sangzhi for firewood combustion, the carbon fixation amount of the mulberry leaf compost, the carbon fixation amount of the silk fiber, the carbon fixation amount of the silkworm chrysalis, the carbon fixation amount of the silkworm excrement and the residual leaf compost, the carbon fixation amount of the mulberry and the carbon fixation amount of the underground biomass to obtain the final mulberry field carbon fixation amount.
Preferably, the calculating the total biomass of the burned mulberry branches by using the planting density and the occupied area of each mulberry variety, the mulberry quantity of each plant and the water content of the mulberry branches, and deducting carbon offset of non-carbon dioxide greenhouse gas generated during burning and natural gas used by firewood burning according to the carbon residue obtained by calculating the total biomass of the burned mulberry branches, wherein the calculating the net carbon fixation amount of the valve Sang Sangzhi for firewood burning comprises the following steps:
tracking biomass carbon used as firewood combustion, calculating total biomass m combustion The calculation formula is as follows:
Figure RE-GDA0003732299920000031
wherein N is the number of times of one year of mulberry, N is the number of varieties of mulberry in a mulberry field, ρ i The planting density s of the ith variety i Is the occupied area of the ith variety, lambda branch，i Is the weight, w, of the mulberry branches planted on each mulberry tree when the mulberry is planted in the ith variety of mulberry branch，i Is the water content of mulberry twig;
based on the total biomass m of the combustion combustion Calculating the net carbon sequestration amount C 'of the bio-combustion' 11 The calculation formula is as follows:
Figure RE-GDA0003732299920000035
wherein Coxi is mulberry Oxidation rate of biomass combustion, C branch Is the carbon content of mulberry branch, coffset combustion Carbon emissions offset for firewood combustion,
Figure RE-GDA0003732299920000032
methane emissions generated for a mass of biomass,
Figure RE-GDA0003732299920000033
nitrous oxide emissions for a mass of biomass.
Preferably, the firewood combustion counteracts carbon emission Coffset combustion The calculation formula is as follows:
Coffset combustion ＝12m combution ×Coxi mulberry ×LHV mulberry ×EF nGas /(LHV nGas ×44)
wherein Coxi is mulberry For the oxidation rate of mulberry twig biomass combustion, LHV mulberry Is the low calorific value of mulberry twig, EF nGas Is the carbon emission coefficient of natural gas, LHV nGas Is the lower calorific value of natural gas.
Preferably, the calculating the carbon residue of the compost of the mulberry leaves according to the total biological mass of the compost mulberry leaves and the weight factor of the compost mulberry leaves, and the calculating the carbon fixation of the compost of the mulberry leaves based on the carbon residue minus the emission of non-carbon dioxide greenhouse gases comprises:
calculating the total biological mass m of the compost compost The calculation formula is as follows:
Figure RE-GDA0003732299920000034
wherein lambda is leaf，i The weight, w, of the mulberry leaves planted on each mulberry tree in the case of the ith variety of mulberry tree mulberry leaf，i The water content of the mulberry leaves is the ith variety of mulberry;
based on the composted mulberry leaves, subtracting the emission of non-carbon dioxide greenhouse gases from the total carbon residue to obtain the net carbon fixation amount C' 12 The calculation formula is as follows:
Figure RE-GDA0003732299920000041
wherein FW compost Is the weight factor of the compost mulberry leaves, C leaf The mulberry leaves contain carbon,
Figure RE-GDA0003732299920000042
methane emissions produced for a quality biomass composting process,/->
Figure RE-GDA0003732299920000043
Nitrous oxide emissions for a quality biomass composting process.
Preferably, the weighting factor FW of the compost mulberry leaves compost The calculation formula is as follows:
Figure RE-GDA0003732299920000044
wherein c i The carbon loss rate of the ith year of the mulberry leaf compost, and gamma is the annual mineralization rate of the humus of the formed soil after four years.
Preferably, the calculating the initial net carbon amount of the silk fiber based on the weight factor of the silk fiber by using the fresh cocoon yield includes:
calculating initial net carbon content C in silk fiber 21 The calculation formula is as follows:
C 21 ＝m cocoon ×β×(1-w fiber )×C fiber (1)
wherein m is cocoon The fresh cocoon yield is the silk fiber yield of fresh cocoons, and w fiber Is the water content of silk fiber, C fiber Is the carbon content in silk fiber;
calculating weight factor FW of silk fiber in 100 years evaluation period fiber The calculation formula is as follows:
FW fiber ＝1-0.76t 0 /100 (2)
wherein t is 0 The service life of the silk products is prolonged after the silk products are made of raw silk, pupa lining and long spitting;
based on the initial net carbon amount in the silk fiber and the weight factor FW of the silk fiber in the 100-year evaluation period fiber Calculating the carbon sequestration amount C 'of the silk fiber' 21 Based on the formula (1) and the formula (2), the calculation formula is as follows:
C′ 21 ＝C 21 ×(1-FW fiber )
＝m cocoon ×β×(1-w fiber )×C fiber ×(0.76t 0 /100)。
preferably, the calculating the carbon fixation amount of the silkworm chrysalis based on the carbon content of the silkworm chrysalis comprises:
calculating the carbon fixation of the carbon flow direction of the mulberry leaves to the silkworm chrysalis, and utilizing the fresh cocoon yield m cocoon Calculating the carbon fixation quantity C 'of silkworm chrysalis' 22 The calculation formula is as follows:
C′ 22 ＝m cocoon ×α×(1-w pupa )×C pupa ×(0.76t pupa /100)
wherein alpha is the percentage of silkworm chrysalis produced by fresh cocoons, and w pupa For the water content in silkworm chrysalis sold as a byproduct after reeling, C pupa Is the carbon content in silkworm chrysalis, t pupa Is carbon fixation time.
Preferably, the calculating the carbon fixing amount of the silkworm excrement and the residual leaves by using the total biomass amount of the silkworm excrement and the residual leaves comprises the following steps:
calculating total biological mass m of faeces Bombycis and edible residual leaf leftover The calculation formula is as follows:
Figure RE-GDA0003732299920000051
wherein θ is the mass ratio of the fresh cocoon quantity to the dried cocoon quantity when the fresh cocoons are dried,
Figure RE-GDA0003732299920000052
is the average water content, W, of different varieties of mulberry leaves dryCocoon Is the water content in the dried cocoons, m leafConsum The mulberry leaf quantity consumed for the respiration activity of the silkworms;
the silkworm excrement and the residual leaves are generally subjected to composting treatment and then returned to the field, and the total biological mass of the silkworm excrement and the residual leaves cannot be weighed, so that the carbon fixation amount C 'in the silkworm excrement and the residual leaves can be calculated by subtracting the dry mass of the silkworm cocoons from the total mulberry leaf amount and removing the mulberry leaf amount consumed by the vital activities of the silkworm' 23 The calculation formula is as follows:
Figure RE-GDA0003732299920000053
wherein C is 23 For the initial carbon-free quantity of silkworm excrement and residual leaves, FW compost For carbon residue in composting process, m leftover Is the total biological mass of the silkworm excrement and the residual leaves.
Preferably, the initial net carbon content C in the silkworm excrement and the residual leaves 23 The net carbon amount in the mulberry field total leaf supply is subtracted by the carbon amount in the silk fiber, the carbon amount of silkworm chrysalis and the carbon amount in carbon dioxide breathed by silkworm, and the calculation formula is as follows:
Figure RE-GDA0003732299920000054
wherein C is fiber Carbon content in silk fiber.
Preferably, the carbon sequestration amount of the underground biomass is calculated by using the ratio of the underground biomass increment to the above-ground biomass increment, and the calculation formula is as follows:
Figure RE-GDA0003732299920000061
wherein tau is the ratio of biomass growth in the subsurface years to biomass growth in the above ground, C root Carbon content, m, of subsurface biomass fruit Is the dry mass of mulberry.
According to the modeling method for the carbon sequestration accounting of the mulberry field ecological system, disclosed by the invention, the carbon sequestration calculation system of the mulberry field is modeled, the carbon sequestration circulation of the mulberry field is respectively analyzed from multiple aspects, a carbon sequestration evaluation method is established, the loss amount in the carbon conversion process is considered, the final release or escape of carbon dioxide caused by falling leaves of mulberry leaves, consumption of mulberry branches of the mulberry leaves, final use waste of silk products and the like is considered in the carbon sequestration detection method, the carbon sequestration amount in the mulberry planting process is detected fairly and transparently, the reliability of a data result is realized, and the modeling method has important significance for the carbon sequestration evaluation of the mulberry field.
Drawings
For a clearer description of embodiments of the invention or of the prior art, the drawings that are used in the description of the embodiments or of the prior art will be briefly described, it being apparent that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from them without inventive effort for a person skilled in the art.
FIG. 1 is a flowchart of a modeling method for carbon sequestration accounting of a mulberry field ecosystem according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of photosynthetic carbon cycle in a mulberry field.
Detailed Description
The core of the invention is to provide a modeling method for the carbon sequestration accounting of the mulberry field ecological system, which divides the circulation of photosynthesis carbon absorbed by the mulberry field ecological system into seven paths, and respectively analyzes and calculates the carbon circulation of the mulberry field from the seven aspects, thereby realizing the accurate calculation of the carbon sequestration amount of the whole mulberry field ecological system and reducing the error of the carbon sequestration amount.
In order to better understand the aspects of the present invention, the present invention will be described in further detail with reference to the accompanying drawings and detailed description. It will be apparent that the described embodiments are only some, but not all, embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, fig. 1 is a flowchart of a first embodiment of a modeling method for carbon sequestration accounting of an ecosystem of a mulberry field according to the present invention; the specific operation steps are as follows:
step S101: calculating total biomass of the burning mulberry branches according to the planting density and occupied area of each mulberry variety, the investigation data of the mulberry branches such as the mulberry quantity of each plant, the water content of the mulberry branches and the like, and according to the carbon residue obtained by calculating the total biomass of the burning mulberry branches, deducting carbon offset of non-carbon dioxide greenhouse gas generated during burning and natural gas used by firewood burning, and calculating to obtain net carbon fixation quantity of the valve Sang Sangzhi for firewood burning;
the carbon sequestration calculation for combustion of biomass is first a trace of biomass carbon used as a payroll for combustion, which burns the total biomass mass m combustion The calculation formula is as follows:
Figure RE-GDA0003732299920000071
wherein N is the number of times of one year of mulberry, N is the number of varieties of mulberry in a mulberry field, ρ i ，s i Is the planting density and the occupied area of the ith variety, lambda branch,i Is the weight, w, of the mulberry branches planted on each mulberry tree when the mulberry is planted in the ith variety of mulberry branch,i Is the water content of mulberry twig;
the carbon in the burnt biomass is biomass carbon formed by absorbing carbon dioxide in the atmosphere and returns to the atmosphere again in a combustion mode, so carbon dioxide generated during combustion does not calculate carbon emission, and farmers use mulberry twigs as firewood for combustion, and the biomass carbon is mainly used for cooking. The use of natural gas is correspondingly reduced when the firewood is burnt. The carbon offset generated in this section can be considered;
methane and nitrous oxide emissions in the bio-combustion process are:
Figure RE-GDA0003732299920000072
wherein, the liquid crystal display device comprises a liquid crystal display device,
Figure RE-GDA0003732299920000073
methane emission produced for a mass of biomass, < >>
Figure RE-GDA0003732299920000074
The amount of nitrous oxide emissions generated for a mass of biomass;
carbon emission Coffset counteracted by firewood combustion combustion The calculation formula is as follows:
Coffset combustion ＝12m combution ×COxi mulberry ×LHV mulberry ×EF nGas /(LHV nGas ×44)
wherein Coxi is mulberry For the oxidation rate of mulberry twig biomass combustion, LHV mulberry Lower calorific value, EF of ramulus Mori nGas Is the carbon emission coefficient of natural gas, LHV nGas Low calorific value of natural gas;
net carbon sequestration of bio-combustion C' 11 The calculation formula is as follows:
Figure RE-GDA0003732299920000081
wherein C is branch Is the carbon content of mulberry branch, coffset combustion Carbon emissions offset for firewood combustion.
Step S102: according to the total biological mass of the mulberry leaves and the weight factors of the composting mulberry leaves, the carbon residue of the mulberry leaf compost is calculated, and the carbon fixation amount of the mulberry leaf compost is calculated based on the carbon residue minus the non-carbon dioxide greenhouse gas emission;
calculation of the in situ composted Mulberry Sang Shegu carbon, total biological mass for composting m compost The method comprises the following steps:
Figure RE-GDA0003732299920000082
wherein lambda is leaf，i The weight, w, of the mulberry leaves planted on each mulberry tree in the case of the ith variety of mulberry tree mulberry leaf，i The water content of the mulberry leaves is the ith variety of mulberry;
a model of the compost of Sang Sheyuan was established with reference to carbon loss or mass loss of forest litter. Assume that the carbon loss rate of the Sang Sheyuan-site compost in the ith year is c i The loss rate of carbon is larger in the first four years, the soluble carbon (DOC) in mulberry leaves is gradually decreased in sequence until Sang Sheyuan, and the soluble carbon (DOC) mainly comprises a plurality of small-molecule saccharides, organic acids, amino acids and peptides which are decomposed under the action of microorganisms, has lower content and tends to be stable. Meanwhile, the microbial metabolites and residues form relatively stable humus in the decomposition process of the mulberry leaves. The refractory substances in the later stage of the decomposition of mulberry leaves form humus precursor substances. Humification and decomposition of the fallen leaves are accompanied. The annual mineralization rate of soil humus formed after four years is basically stableSetting, namely setting gamma;
according to PSA2050:2011, if the product slowly releases carbon dioxide in the 100-year evaluation period, the original carbon quantity should be multiplied by a weight factor when the total carbon quantity released is calculated, and the weight factor has a calculation formula of
Figure RE-GDA0003732299920000091
The weighting factors for compost Sang Shelai are:
Figure RE-GDA0003732299920000092
wherein c i The carbon loss rate of the ith year of the mulberry leaf compost, and gamma is the annual mineralization rate of the humus of the formed soil after four years;
based on the composted mulberry leaves, subtracting the emission of non-carbon dioxide greenhouse gases from the total carbon residue to obtain the net carbon fixation amount C' 12 The calculation formula is as follows:
Figure RE-GDA0003732299920000093
wherein FW compost Is the weight factor of the compost mulberry leaves, C leaf The mulberry leaves contain carbon,
Figure RE-GDA0003732299920000094
methane emissions produced for a quality biomass composting process,/->
Figure RE-GDA0003732299920000095
Methane emissions are produced for a quality biomass composting process.
Step S103: calculating the initial net carbon content of the silk fiber by utilizing the fresh cocoon yield and the silk fiber yield of the fresh cocoons, and calculating the carbon fixation content of the silk fiber based on the weight factor of releasing the storage carbon at one time when the service life of the silk fiber product is finished;
feeding mulberry leaf to silkworm, cocooning, reeling silk to become silkworm chrysalis, silk and spittingThe first four types are called silk fiber. The raw silk can be made into silk products such as clothing, ties, scarves, etc., and the long spit, pupa lining and defective cocoon cotton can be further processed into silk threads to be made into silk products or directly processed into silk quilts. The silk products have a certain service life, and the carbon stored in the silk products is subjected to incineration, landfill and other means to finish carbon release once at the end of the service life of various silk products. For a mulberry field with a certain area, if the fresh cocoon yield is m cocoon The silk fiber yield of the fresh cocoons is beta. The initial net carbon content in the silk fiber is
C 21 ＝m cocoon ×β×(1-w fiber) ×C fiber (1)
Wherein m is cocoon For fresh cocoon yield, beta is silk fiber yield of fresh cocoons, w fiber Is the water content of silk fiber, C fiber Is the carbon content in silk fiber;
weight factor FW of silk fiber in 100 years evaluation period fiber The calculation formula is as follows:
FW fiber ＝1-0.76t 0 /100 (2)
wherein t is 0 The product has long service life after being made into various silk products.
Calculating the carbon sequestration of the carbon flow direction of the mulberry leaf to the silk fiber, and obtaining the net carbon sequestration C 'of the silk fiber in the 100-year evaluation period according to the formula (1) and the formula (2)' 21 The calculation formula is as follows:
C′ 21 ＝C 21 ×(1-FW fiber )
＝m cocoon ×β×(1-w fiber )×C fiber ×(0.76t 0 /100)。
step S104: calculating the carbon fixation amount of the silkworm chrysalis based on the carbon content in the silkworm chrysalis;
the silkworm chrysalis has high carbon content, and is generally used as a fish or poultry feed additive or used as a bait product. The average time from the formation of the silkworm chrysalis to the preparation of various feed products by reeling silk to the use is that the silkworm chrysalis is taken as feed and is digested into excrement to be discharged, and further carbon fixation can be realized if the excrement is composted into an organic fertilizer;
calculating the carbon fixation of the carbon in the mulberry leaf flowing to the silkworm chrysalis, the net carbon fixation amount C 'in the silkworm chrysalis' 22 The calculation formula is as follows:
C′ 22 ＝m cocoon ×α×(1-w pupa )×C pupa ×(0.76t pupa /100)
wherein alpha is the percentage of silkworm chrysalis produced by fresh cocoons, and w pupa For the water content in silkworm chrysalis sold as a byproduct after reeling, C pupa Is the carbon content in silkworm chrysalis, t pupa Is carbon fixation time.
Step S105: calculating the carbon fixation amount of the silkworm excrement and the residual leaf compost by using the total biomass amount of the silkworm excrement and the residual leaf;
the silkworm excrement and the residual leaves are rapidly composted by small composting equipment capable of controlling the temperature and the humidity, and deep-buried composting in the mulberry field can be adopted. The total biological mass of silkworm excrement and residual leaves can not be weighed, the dry mass of silkworm cocoons can be subtracted from the total mulberry leaf mass, and the mulberry leaf mass m consumed by the vital activities of silkworms can be removed leafConsum . The silkworm vital activity changes part of mulberry leaves consumed into carbon dioxide to be discharged out of the body in a breathing mode. The total leaf supply can be estimated by the annual fresh cocoon yield of the mulberry field, generally, 14 kg of mulberry leaves are consumed per 1 kg of fresh cocoons, if the average water content of the mulberry leaves of different varieties is
Figure RE-GDA0003732299920000101
The total leaf supply amount is->
Figure RE-GDA0003732299920000102
So the total biological mass m of the silkworm excrement and the residual leaves leftover The method comprises the following steps:
Figure RE-GDA0003732299920000111
wherein θ is the mass ratio of the fresh cocoon quantity to the dried cocoon quantity when the fresh cocoons are dried,
Figure RE-GDA0003732299920000112
is the average water content, W, of different varieties of mulberry leaves dryCocoon Is the water content in the dried cocoons, m leafConsum The mulberry leaf quantity consumed for the vital activity of the silkworms;
the carbon fixation calculation of silkworm excrement and residual leaves is carried out, and because the component ratio of the silkworm excrement to the residual leaves cannot be determined, the carbon content in the biomass cannot be obtained, and the initial carbon content C in the silkworm excrement and residual leaves can be obtained by subtracting the carbon content in silk fibers, the carbon content in silkworm chrysalis and the carbon content in carbon dioxide breathed by silkworms from the total carbon content in the supplied mulberry leaves 23 The calculation formula is as follows:
Figure RE-GDA0003732299920000113
the carbon fixation amount C 'in the silkworm excrement and the residual leaves' 23 The calculation formula is as follows:
Figure RE-GDA0003732299920000114
wherein C is 23 To obtain the initial carbon-free quantity FW of silkworm excrement and residual leaves compost For carbon residue in composting process, m leftover Is the total biological mass of the silkworm excrement and the residual leaves.
Step S106: calculating the carbon sequestration amount C 'of the mulberries by utilizing the biomass amount of the mulberries' 3 ；
The mulberry is quite short in period from formation to sale, so that the carbon dioxide formed by the photosynthesis is basically returned to the air, and the carbon fixation amount C' 3 ＝0。
Step S107: calculating the carbon sequestration amount of the underground biomass by utilizing the ratio of the biomass increment of the underground year to the biomass increment of the overground;
the growth of the underground biomass is proportional to the growth of the overground biomass, and the proportional relationship is mainly determined by the climate and soil characteristics of the planting land, and the carbon fixation amount C 'of the underground biomass' 4 The calculation formula is as follows:
Figure RE-GDA0003732299920000115
wherein tau is the ratio of biomass growth in the subsurface years to biomass growth in the above ground, C root Carbon content, m, of subsurface biomass fruit Is the dry mass of mulberry.
Step S108: combining and calculating the carbon fixation amount to obtain the final mulberry field carbon fixation amount;
C′ 0 ＝(C′ 11 +C′ 12 +C′ 21 +C′ 22 +C′ 23 +C′ 3 +C′ 4 )×44/12。
according to the modeling method for carbon sequestration accounting of the mulberry field ecological system, seven circulation paths of carbon generated by photosynthesis in the mulberry field ecological system for silkworm breeding are analyzed through constructing the mulberry field carbon sequestration calculation system, carbon sequestration in the seven circulation paths is calculated respectively, detailed calculation is carried out on final release or escape of carbon dioxide caused by combustion of mulberry branch firewood, composting of mulberry leaves, carbon conversion of mulberry leaf organisms, final use waste of silk products and the like through tracking loss in a carbon circulation process, a series of models for carbon sequestration accounting of the mulberry field ecological system are established, and the modeling method has important significance for the fair evaluation of the carbon sequestration science of the mulberry field.
Based on the above embodiment, in this embodiment, the area of the mulberry field is 300 mu, the number of times of one year of mulberry field is n=2, the number of varieties of mulberry field is n=3, wherein the experimental data of 40 mu of hybrid mulberry field, 35 mu of fruit mulberry field and 225 mu of crop mulberry field are used for verifying the steps of the method according to the present invention, please refer to the calculation parameter list of the net amount of carbon in the mulberry field in table 1 and the photosynthesis carbon cycle schematic diagram of the mulberry field in fig. 2, specifically as follows:
table 1 list of calculated parameters for net carbon in varroa
Figure RE-GDA0003732299920000121
The mulberry is used for burning firewood twice a year, and the total dry matter amount for burning firewood is 228.23t.
According to the default recommended by IPCC2006 national inventory guidelines, if a conventional range is used, the methane and nitrous oxide emissions produced upon combustion are 2.4 and 0.08g/kg fuel, respectively.
Farmers use mulberry branches as firewood for burning, which is mainly used for cooking and boiling. The use of natural gas is correspondingly reduced when the firewood is burnt. This partial carbon offset can be considered. Low-calorific-value LHV (liquefied Natural gas) of natural gas can be obtained according to data of Chinese energy statistics annual survey 2017 nGas For 38.931MJ/m3, query low calorific value NTV of willow in Phyllis database of biomass composition database mulberry For 18.11MJ/kg, the combustion of ramulus Mori can use low calorific value of willow combustion. The carbon emission coefficient of natural gas is 2.47kg CO2e/kg, and the oxidation rate of biomass combustion is 0.9. The carbon emission which can be calculated as offset by firewood combustion is 64.366 tons of carbon equivalent, which is indicated as 64.366 tCE, i.e. the net biomass carbon fixation C' 11 70.386tCE.
The general use of compost is mulberry leaves, and according to Table 1, the total biomass of 158.514t mulberry leaves can be calculated.
A model of the compost of Sang Sheyuan was established with reference to carbon loss or mass loss of forest litter. Assuming that the carbon loss rate in the ith four years of Sang Sheyuan th compost is c i 47%, 17.5%,7.1% and 2.4% in this order. The loss rate of carbon is larger in the first four years, the soluble carbon (DOC) in mulberry leaves is gradually decreased to Sang Sheyuan after four years of composting, and mainly comprises a large part of small-molecule saccharides, organic acids, amino acids and peptides which are decomposed under the action of microorganisms, so that the content is lower and the mulberry leaves tend to be stable. Meanwhile, the microbial metabolites and residues form relatively stable humus in the decomposition process of the mulberry leaves. The refractory substances in the later stage of the decomposition of mulberry leaves form humus precursor substances. The annual mineralization rate of the soil humus formed after four years is basically stable to be gamma=1%;
the carbon residue of the compost at Sang Sheyuan was calculated to be 13.301tCE over the 100 year evaluation period. Compost according to vegetable wastes and wheat strawsThe carbon sequestration amount C 'of the mulberry leaf compost is obtained by measuring the non-carbon dioxide greenhouse gas emissions of 0.4085 g/kg dry compost raw material and the emissions of methane and nitrous oxide of 0.1618g/kg, respectively' 12 10.776tCE.
Feeding mulberry leaves to silkworms, cocooning the silkworms, reeling the cocoons into silkworm chrysalis, raw silk, long spitting, a chrysalis lining and defective cocoon cotton, and the last four types are called silk fibers. The raw silk can be made into silk products such as clothing, ties, scarves, etc., and the long spit, pupa lining and defective cocoon cotton can be further processed into silk threads to be made into silk products or directly processed into silk quilts. The silk products have a certain service life, and the carbon stored in the silk products is subjected to incineration, landfill and other means to finish carbon release once at the end of the service life of various silk products. The mulberry base has the advantages that the fresh cocoon yield of the mulberry base in 2020 year is 21625kg, the silk fiber yield of the fresh cocoons is 16.29%, the water content of the silk fibers is 9.91%, the carbon content of the silk fibers is 38%, and the service life of the mulberry base after various silk products are made from raw silk, pupa liners and long spitting is 15 years. The carbon fixation amount C 'of the silk fiber in the 100-year evaluation period can be calculated' 21 0.1375 tCE.
The silkworm chrysalis has high carbon content, and is generally used as a fish or poultry feed additive or used as a bait product. The average time from the formation of silkworm chrysalis to the preparation of various feed products by reeling silk to the use is 2 years, the silkworm chrysalis is taken as feed and is digested into excrement to be discharged, and further carbon fixation can be realized if the excrement is further composted into organic fertilizer. In the example, the carbon residue after digestion is not considered, only the carbon emission is carried out when the silkworm chrysalis becomes feed after 2 years, the carbon content in the silkworm chrysalis is 54.5%, the water content is 9.91%, the percentage of the fresh cocoons produced silkworm chrysalis is 19.916%, and the carbon fixation amount C 'in the silkworm chrysalis can be calculated' 22 0.032tCE.
The silkworm excrement and the residual leaves are rapidly composted by small composting equipment capable of controlling the temperature and the humidity, and deep-buried composting in the mulberry field can be adopted. The total biological mass of silkworm excrement and residual leaves can not be weighed, the dry mass of silkworm cocoons can be subtracted from the total mulberry leaf mass, and the mulberry leaf mass consumed by the vital activities of silkworms is removed. The silkworm vital activity changes part of mulberry leaf consumption into carbon dioxide for respirationIs discharged outside the body in the form of (2). The total leaf supply amount can be estimated by the annual fresh cocoon yield of the mulberry field, generally, 14 kg of mulberry leaves are required to be consumed per 1 kg of fresh cocoons, if the average water content of the mulberry leaves of different varieties is 73.75%, the total fresh cocoon yield is 21.625 tons, the mass ratio of the fresh cocoon amount to the dried cocoon amount is 2.74 when the fresh cocoons are dried, but after the cocoons are dried, the dried cocoons are not dried until no water exists, and meanwhile, the water content of the dried cocoons still can absorb air to reach the water content balance, and the water content in the dried cocoons is 9.91%. The total dry matter of the silkworm excrement and the residual leaves is 76.742t, the net carbon content in the silkworm excrement and the residual leaves is 35.209tCE, and the carbon fixation amount C 'of the silkworm excrement and the residual leaves is finally calculated' 23 5.207tCE.
The carbon dioxide formed by the mulberry in photosynthesis basically returns to the air, so the carbon fixation amount C 'in the mulberry' 3 Is 0.
According to the IPCC national greenhouse gas inventory guidelines in 2006, because Zhejiang belongs to subtropical climate, the ratio of the biomass of the underground part to the biomass of the overground part of the mulberry can be determined to be 0.23, and the carbon content of the underground biomass is 0.5 adopting the IPCC default value, so that the underground carbon fixation amount C 'can be calculated' 4 55.121tCE.
By combining the calculation results of the seven parts, the total carbon fixation amount of the whole mulberry field 2020 is 141.66tCE, the total carbon fixation amount is 519.418tCO2e, and the calculated carbon fixation amount per year per public cant is 25.97tCO2e/ha/year.
According to the modeling method for the carbon sequestration accounting of the mulberry field ecological system, which is provided by the embodiment, a carbon sequestration calculation model of the mulberry field ecological system is established to divide carbon sequestration of the mulberry field ecological system into seven parts and seven paths, data analysis is carried out on carbon sequestration calculation of carbon in the seven paths in an evaluation period of 100 years, carbon sequestration data of the whole mulberry field ecological system is obtained, the problems that an empirical formula is utilized in the existing carbon sequestration calculation, rough errors are large are solved, carbon release conditions of all parts are clear, and accurate detection of carbon sequestration of the mulberry field is achieved.
In this specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, so that the same or similar parts between the embodiments are referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative elements and steps are described above generally in terms of functionality in order to clearly illustrate the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The modeling method for the carbon sequestration accounting of the mulberry field ecological system provided by the invention is described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.

Claims (1)

1. The modeling method for the carbon sequestration accounting of the mulberry field ecosystem is characterized by comprising the following steps of:
calculating total biomass of the burning mulberry branches by using the planting density and the occupied area of each mulberry variety, the mulberry quantity of each plant and the water content of the mulberry branches, deducting carbon offset of non-carbon dioxide greenhouse gas generated during burning and natural gas used by firewood burning according to the carbon residue obtained by calculating the total biomass of the burning mulberry branches, and calculating to obtain net carbon fixation quantity of the valve Sang Sangzhi used for firewood burning;
according to the total biological mass of the mulberry leaves and the weight factors of the composting mulberry leaves, the carbon residue of the mulberry leaf compost is calculated, and the carbon fixation amount of the mulberry leaf compost is calculated based on the carbon residue minus the non-carbon dioxide greenhouse gas emission;
calculating the initial net carbon content of the silk fiber by utilizing the fresh cocoon yield and the silk fiber yield of the fresh cocoons, and calculating the carbon fixation content of the silk fiber based on the weight factor of releasing the storage carbon at one time when the service life of the silk fiber product is finished;
calculating the carbon fixation amount of the silkworm chrysalis based on the carbon content in the silkworm chrysalis;
calculating the carbon fixation amount of the silkworm excrement and the residual leaf compost by using the total biological mass of the silkworm excrement and the residual leaf;
calculating the carbon sequestration amount of the mulberries by utilizing the biomass amount of the mulberries;
calculating the carbon sequestration amount of the underground biomass by utilizing the ratio of the biomass increment of the underground year to the biomass increment of the overground;
combining and calculating the net carbon fixation amount of the valve Sang Sangzhi for firewood combustion, the carbon fixation amount of the mulberry leaf compost, the carbon fixation amount of the silk fiber, the carbon fixation amount of the silkworm chrysalis, the carbon fixation amount of the silkworm excrement and the residual leaf compost, the carbon fixation amount of the mulberry and the carbon fixation amount of the underground biomass to obtain the final mulberry field carbon fixation amount;
calculating total biomass of the burnt mulberry branches by using the planting density and the occupied area of each mulberry variety, the mulberry quantity of each plant and the water content of the mulberry branches, deducting carbon offset of non-carbon dioxide greenhouse gas generated during burning and natural gas used by firewood burning according to the carbon residue obtained by calculating the total biomass of the burnt mulberry branches, and calculating the net carbon fixation quantity of the valve Sang Sangzhi for firewood burning comprises the following steps:
tracking biomass carbon used as firewood combustion, calculating total biomass m combustion The calculation formula is as follows:
Figure FDA0004175544560000021
wherein N is the number of times of one year of mulberry, N is mulberryNumber of mulberry varieties in garden, ρ i The planting density s of the ith variety i Is the occupied area of the ith variety, lambda branch,i Is the weight, w, of the mulberry branches planted on each mulberry tree when the mulberry is planted in the ith variety of mulberry branch,i Is the water content of mulberry twig;
based on the total biomass m of the combustion combustion Calculating the net carbon sequestration amount C 'of the bio-combustion' 11 The calculation formula is as follows:
Figure FDA0004175544560000022
wherein Coxi is mulberry Oxidation rate of biomass combustion, C branch Is the carbon content of mulberry branch, coffset combustion Carbon emissions offset for firewood combustion,
Figure FDA0004175544560000023
methane emission produced for a mass of biomass, < >>
Figure FDA0004175544560000024
The amount of nitrous oxide emissions generated for a mass of biomass;
carbon emission Coffset counteracted by firewood combustion combustion The calculation formula is as follows:
Coffset combustion ＝12m combution ×Coxi mulberry ×LHV mulberry ×EF nGas /(LHV nGas ×44)
wherein Coxi is mulberry For the oxidation rate of mulberry twig biomass combustion, LHV mulberry Is the low calorific value of mulberry twig, EF nGas Is the carbon emission coefficient of natural gas, LHV nGas Is the low calorific value of natural gas;
the carbon residue of the compost of the mulberry leaves is calculated according to the total biological mass of the compost mulberry leaves and the weight factor of the compost mulberry leaves, and the carbon fixation amount of the compost of the mulberry leaves is calculated based on the carbon residue minus the emission amount of non-carbon dioxide greenhouse gases and comprises the following steps:
calculating the total biological mass m of the compost compost The calculation formula is as follows:
Figure FDA0004175544560000031
wherein lambda is leaf,i The weight, w, of the mulberry leaves planted on each mulberry tree in the case of the ith variety of mulberry tree mulberry leaf,i The water content of the mulberry leaves is the ith variety of mulberry;
based on the composted mulberry leaves, subtracting the emission of non-carbon dioxide greenhouse gases from the total carbon residue to obtain the net carbon fixation amount C' 12 The calculation formula is as follows:
Figure FDA0004175544560000032
wherein FW compost Is the weight factor of the compost mulberry leaves, C leaf The mulberry leaves contain carbon,
Figure FDA0004175544560000033
methane emissions produced for a quality biomass composting process,/->
Figure FDA0004175544560000034
Nitrous oxide emissions from a quality biomass composting process;
the weighting factor FW of the compost mulberry leaves compost The calculation formula is as follows:
Figure FDA0004175544560000035
wherein c i The carbon loss rate of the ith year of the mulberry leaf compost, and gamma is the annual mineralization rate of the humus of the formed soil after four years;
the method for calculating the initial net carbon quantity of the silk fiber based on the weight factor of the silk fiber by utilizing the fresh cocoon yield comprises the following steps of:
calculating initial net carbon content C in silk fiber 21 The calculation formula is as follows:
C 21 ＝m cocoon ×β×(1-w fiber )×C fiber (1)
wherein m is cocoon For fresh cocoon yield, beta is silk fiber yield of fresh cocoons, w fiber Is the water content of silk fiber, C fiber Is the carbon content in silk fiber;
calculating weight factor FW of silk fiber in 100 years evaluation period fiber The calculation formula is as follows:
FW fiber ＝1-0.76t 0 /100 (2)
wherein t is 0 The service life of the silk products is prolonged after the silk products are made of raw silk, pupa lining and long spitting;
based on the initial net carbon amount in the silk fiber and the weight factor FW of the silk fiber in the 100-year evaluation period fiber Calculating the carbon sequestration amount C 'of the silk fiber' 21 Based on the formula (1) and the formula (2), the calculation formula is as follows:
C′ 21 ＝C 21 ×(1-FW fiber )
＝m cocoon ×β×(1-w fiber )×C fiber ×(0.76t 0 /100)；
the method for calculating the carbon fixation amount of the silkworm chrysalis based on the carbon content of the silkworm chrysalis comprises the following steps:
calculating the carbon fixation of the carbon flow direction of the mulberry leaves to the silkworm chrysalis, and utilizing the fresh cocoon yield m cocoon Calculating the carbon fixation quantity C 'of silkworm chrysalis' 22 The calculation formula is as follows:
C′ 22 ＝m cocoon ×α×(1-w pupa )×C pupa ×(0.76t pupa /100)
wherein alpha is the percentage of silkworm chrysalis produced by fresh cocoons, and w pupa For the water content in silkworm chrysalis sold as a byproduct after reeling, C pupa Is the carbon content in silkworm chrysalis, t pupa Is carbon fixation time length;
the method for calculating the carbon fixation amount of the silkworm excrement and the residual leaves by using the total biomass amount of the silkworm excrement and the residual leaves comprises the following steps:
calculating total biological mass m of faeces Bombycis and edible residual leaf leftover The calculation formula is as follows:
Figure FDA0004175544560000041
wherein θ is the mass ratio of the fresh cocoon quantity to the dried cocoon quantity when the fresh cocoons are dried,
Figure FDA0004175544560000042
is the average water content, W, of different varieties of mulberry leaves dryCocoon Is the water content in the dried cocoons, m leafConsum The mulberry leaf quantity consumed for the respiration activity of the silkworms;
the silkworm excrement and the residual leaves are generally subjected to composting treatment and then returned to the field, and the total biological mass of the silkworm excrement and the residual leaves cannot be weighed, so that the carbon fixation amount C 'in the silkworm excrement and the residual leaves can be calculated by subtracting the dry mass of the silkworm cocoons from the total mulberry leaf amount and removing the mulberry leaf amount consumed by the vital activities of the silkworm' 23 The calculation formula is as follows:
Figure FDA0004175544560000043
wherein C is 23 1-FW for the initial carbon amount in silkworm excrement and residual leaves compost For carbon residue in composting process, m leftover The total biological mass of the silkworm excrement and the residual leaves;
the initial carbon amount C in the silkworm excrement and the residual leaves 23 The net carbon amount in the mulberry field total leaf supply is subtracted by the carbon amount in the silk fiber, the carbon amount of silkworm chrysalis and the carbon amount in carbon dioxide breathed by silkworm, and the calculation formula is as follows:
Figure FDA0004175544560000051
wherein C is fiber Carbon content in silk fiber，
Figure FDA0004175544560000052
The water content is the average water content of different varieties of mulberry leaves;
the carbon sequestration amount of the underground biomass is calculated by utilizing the ratio of the biomass increment of the underground year to the biomass increment of the overground, and the calculation formula is as follows:
Figure FDA0004175544560000053
wherein tau is the ratio of biomass growth in the subsurface years to biomass growth in the above ground, C root Carbon content, m, of subsurface biomass fruit Is the dry mass of mulberry.
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