CN114456809A - Magnesium modified bamboo dust charcoal and application thereof in soil carbon sequestration and emission reduction - Google Patents
Magnesium modified bamboo dust charcoal and application thereof in soil carbon sequestration and emission reduction Download PDFInfo
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- 239000002689 soil Substances 0.000 title claims abstract description 81
- 235000017166 Bambusa arundinacea Nutrition 0.000 title claims abstract description 72
- 235000017491 Bambusa tulda Nutrition 0.000 title claims abstract description 72
- 241001330002 Bambuseae Species 0.000 title claims abstract description 72
- 235000015334 Phyllostachys viridis Nutrition 0.000 title claims abstract description 72
- 239000011425 bamboo Substances 0.000 title claims abstract description 72
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 59
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 55
- 239000011777 magnesium Substances 0.000 title claims abstract description 53
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 title claims abstract description 50
- 229910052749 magnesium Inorganic materials 0.000 title claims abstract description 50
- 239000000428 dust Substances 0.000 title claims abstract description 29
- 239000003610 charcoal Substances 0.000 title claims abstract description 19
- 230000009467 reduction Effects 0.000 title claims abstract description 12
- 230000009919 sequestration Effects 0.000 title abstract description 9
- 238000011282 treatment Methods 0.000 claims abstract description 45
- 240000008042 Zea mays Species 0.000 claims abstract description 15
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 claims abstract description 15
- 235000002017 Zea mays subsp mays Nutrition 0.000 claims abstract description 15
- 235000005822 corn Nutrition 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 15
- 238000000227 grinding Methods 0.000 claims abstract description 10
- 238000002156 mixing Methods 0.000 claims abstract description 9
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000007873 sieving Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- TWRXJAOTZQYOKJ-UHFFFAOYSA-L Magnesium chloride Chemical compound [Mg+2].[Cl-].[Cl-] TWRXJAOTZQYOKJ-UHFFFAOYSA-L 0.000 claims description 12
- 238000003763 carbonization Methods 0.000 claims description 11
- 238000000197 pyrolysis Methods 0.000 claims description 11
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 8
- 238000012545 processing Methods 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 6
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 claims description 6
- 229910001629 magnesium chloride Inorganic materials 0.000 claims description 6
- 229910052698 phosphorus Inorganic materials 0.000 claims description 6
- 239000011574 phosphorus Substances 0.000 claims description 6
- 239000011591 potassium Substances 0.000 claims description 6
- 229910052700 potassium Inorganic materials 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 238000001816 cooling Methods 0.000 claims description 5
- 229910052757 nitrogen Inorganic materials 0.000 claims description 5
- 229910001868 water Inorganic materials 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- 239000000463 material Substances 0.000 claims description 4
- 238000007605 air drying Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 claims description 2
- 239000002245 particle Substances 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 7
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- 238000003912 environmental pollution Methods 0.000 abstract 1
- 238000009776 industrial production Methods 0.000 abstract 1
- 238000006386 neutralization reaction Methods 0.000 abstract 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 26
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 13
- 239000000047 product Substances 0.000 description 8
- 239000003337 fertilizer Substances 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 239000005431 greenhouse gas Substances 0.000 description 5
- 238000007599 discharging Methods 0.000 description 3
- 239000001095 magnesium carbonate Substances 0.000 description 3
- 229910000021 magnesium carbonate Inorganic materials 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000010792 warming Methods 0.000 description 3
- 239000002028 Biomass Substances 0.000 description 2
- BVKZGUZCCUSVTD-UHFFFAOYSA-L Carbonate Chemical compound [O-]C([O-])=O BVKZGUZCCUSVTD-UHFFFAOYSA-L 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 239000003570 air Substances 0.000 description 2
- 230000033558 biomineral tissue development Effects 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000004907 flux Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- ZLNQQNXFFQJAID-UHFFFAOYSA-L magnesium carbonate Chemical compound [Mg+2].[O-]C([O-])=O ZLNQQNXFFQJAID-UHFFFAOYSA-L 0.000 description 2
- 229910044991 metal oxide Inorganic materials 0.000 description 2
- 150000004706 metal oxides Chemical class 0.000 description 2
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen(.) Chemical compound [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 2
- KMUONIBRACKNSN-UHFFFAOYSA-N potassium dichromate Chemical compound [K+].[K+].[O-][Cr](=O)(=O)O[Cr]([O-])(=O)=O KMUONIBRACKNSN-UHFFFAOYSA-N 0.000 description 2
- 238000009331 sowing Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 206010021143 Hypoxia Diseases 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003463 adsorbent Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 238000005904 alkaline hydrolysis reaction Methods 0.000 description 1
- 239000012080 ambient air Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 150000001450 anions Chemical class 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000000498 ball milling Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010170 biological method Methods 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000007385 chemical modification Methods 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 239000008367 deionised water Substances 0.000 description 1
- 229910021641 deionized water Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 239000000706 filtrate Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910052500 inorganic mineral Inorganic materials 0.000 description 1
- VTHJTEIRLNZDEV-UHFFFAOYSA-L magnesium dihydroxide Chemical compound [OH-].[OH-].[Mg+2] VTHJTEIRLNZDEV-UHFFFAOYSA-L 0.000 description 1
- 239000000347 magnesium hydroxide Substances 0.000 description 1
- 229910001862 magnesium hydroxide Inorganic materials 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000011707 mineral Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002715 modification method Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002680 soil gas Substances 0.000 description 1
- 238000004158 soil respiration Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/02—Soil-conditioning materials or soil-stabilising materials containing inorganic compounds only
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- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Soil Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention discloses magnesium modified bamboo scrap biochar and application thereof in soil carbon fixation and emission reduction2.6H2O, filtering after mixing and contact treatment for a preset time, and then drying, grinding and sieving the filtered matter to obtain the magnesium modified bamboo dust charcoal; the magnesium modified bamboo dust charcoal has the effects on soil: increase the carbon fixation of soil, stabilize the organic carbon reservoir of soil, maintain the carbon balance of soil and reduce the CO in farmland soil2Release to the atmosphere; the magnesium modified bamboo dust charcoal can be used for farmland soil CO2Emission reduction, soil carbon sequestration and corn planting, and has the advantages of simple operation, low cost, easy industrial production and capability of reducing farmland soil CO2Discharge, reduce environmental pollution, increase the carbon fixation of soil, increase the corn kernel yield, improve the carbon neutralization capacity, and have the advantages of environmental protection, economy and obvious effectHas the advantages of simple process and low cost.
Description
Technical Field
The invention relates to the technical field of carbon sequestration and emission reduction of biochar, in particular to magnesium modified bamboo dust biochar and application thereof in soil carbon sequestration and emission reduction.
Background
The soil carbon reservoir is the largest and most active carbon reservoir in the terrestrial ecosystem and is also the main carbon source for atmospheric greenhouse gases. Huge carbon capacity and natural carbon sequestration of soilIn use, it has a significant impact on the storage or release of carbon in the atmosphere. Atmospheric CO2The concentration is increased and the carbon reserve of the soil is reduced, which not only causes the soil to be barren and degraded to restrict the agricultural development, but also aggravates the global warming. In recent years, the problem of climate warming caused by an increase in greenhouse gas emissions has attracted continuous attention, and the global average temperature has risen 0.6501.06 ℃ over the past 100 years. CO22The contribution to global warming as the most dominant greenhouse gas is about 55%. Therefore, there is a need to provide a method for continuously and effectively reducing soil CO2The discharged material.
The biochar refers to highly aromatized carbon-fixing substances produced by pyrolysis and carbonization of biomass under the condition of oxygen deficiency or oxygen limitation. Although biochar can sequester carbon for long periods of time and affect soil greenhouse gas emissions by affecting soil carbon reservoir characteristics. However, the properties of the biochar, such as the pH value and the carbon content, change with time, the chemical changes affect the biomass of microorganisms and the emission reduction efficiency of the biochar, and the biochar can be modified to improve the stability and the applicability of the biochar. At present, the methods for modifying the biochar mainly comprise chemical modification methods (acid, alkali and hydrogen peroxide), physical modification methods (steam, ball milling and microwave), surface covering methods immersed in mineral or inorganic adsorbents, biological methods (digestion) and magnetic modification. Wherein, the inventor proves that magnesium chloride can form metal oxides (MgO and Mg (OH) on the surface of the biochar2) Can improve the adsorption capacity of the biochar to anions. Due to MgO/Mg (OH)2With CO2The reaction can form MgCO3Thereby capturing CO generated in the soil2Therefore, the magnesium modified bamboo dust biochar can improve the capability of biochar in adsorbing carbonate ions and reduce soil CO2Potential for emissions.
The following reactions may explain its possible mechanism:
MgO+CO2→MgCO3
Mg(OH)2+CO2→MgCO3+H2O。
disclosure of Invention
In view of the above, the present invention aims to provide a magnesium modified bamboo sawdust biochar which is reliable in implementation, simple in preparation method, and environment-friendly and can increase carbon retention of soil, and an application thereof in soil carbon fixation and emission reduction.
In order to achieve the technical purpose, the technical scheme adopted by the invention is as follows:
a magnesium modified bamboo sawdust biochar is prepared by carrying out high-temperature pyrolysis carbonization and cooling treatment on bamboo sawdust with a preset water content, then grinding the bamboo sawdust to a preset particle size, and then mixing the ground product with MgCl with a preset concentration2.6H2And O, filtering after mixing and contact treatment for a preset time, and drying, grinding and sieving the filtered matter to obtain undersize matters, thus obtaining the magnesium modified bamboo dust charcoal.
Based on the above, the invention provides a preparation method of magnesium modified bamboo scrap biochar, which comprises the following steps:
(1) processing bamboo scraps into bamboo scraps with the moisture content of below 10%, then placing the bamboo scraps under an oxygen-limited condition for high-temperature pyrolysis carbonization treatment, wherein the temperature of the pyrolysis carbonization treatment is 500 ℃, preserving heat for 2 hours under the condition, then cooling to room temperature, grinding a product, and enabling the product to pass through a 100-mesh screen to obtain biochar;
(2) MgCl with the molar concentration of 1mol/L is prepared2·6H2O solution;
(3) biochar is mixed with 1mol/L MgCl2·6H2Mixing the O solution according to the solid-liquid ratio of 1:5, stirring the mixed system to uniformly mix the O solution and the mixed system, placing the mixed system in a constant-temperature vibrator to vibrate for 3 hours, then standing for 24 hours, then filtering through a 100-mesh screen, placing the filtered matter in an environment of 105 ℃ to dry for 12 hours, then grinding the dried material and sieving through the 100-mesh screen to obtain the undersize product, and finally obtaining the magnesium modified bamboo dust charcoal.
As a preferred alternative, in the step (1), the bamboo chips are preferably dried by natural air to have a moisture content of 10% or less.
As a preferred alternative, it is preferable that the temperature increase rate of the pyrolysis and carbonization treatment in the step (1) is 10 ℃/m 11.
As a preferred alternative, in step (3), the stirring treatment is preferably carried out at a rotation speed of 180r/m11 for a stirring period of 1 hour.
As a preferred alternative, it is preferable that the biochar produced in step (1) has a pH of 9.4, a total carbon content of 775.00g/kg, a total nitrogen content of 4.00g/kg, a total phosphorus content of 2.20g/kg, a total potassium content of 4.10g/kg, and a specific surface area of 6.40m2/g。
Based on the above, the invention also provides an application of the magnesium modified bamboo dust biochar in soil carbon sequestration and emission reduction, which comprises the following steps: the magnesium modified bamboo dust charcoal prepared by the preparation method is scattered in soil.
As a preferred alternative, the magnesium modified bamboo dust charcoal is preferably applied to the soil in an amount of 40 t.hm-2After the application, the magnesium modified bamboo sawdust biochar is dispersed and mixed to the depth of 20cm of soil and is raked evenly.
As a preferred alternative, preferably, the soil is corn planting soil.
Based on the above, the invention also provides an application of the magnesium modified bamboo sawdust biochar in corn planting improvement, which comprises the step of applying the magnesium modified bamboo sawdust biochar prepared by the preparation method in corn planting soil.
By adopting the technical scheme, compared with the prior art, the invention has the beneficial effects that: in the scheme, the biochar is prepared by utilizing bamboo sawdust, and 1mol/L MgCl is added2·6H2Preparing the solution O into magnesium modified bamboo dust charcoal; the biological carbon component in the magnesium modified bamboo dust biological carbon has the following effects on soil: increase the carbon fixation of soil, stabilize the organic carbon reservoir of soil, maintain the carbon balance of soil and reduce the CO in farmland soil2Release to the atmosphere. The magnesium modified bamboo dust biochar in the scheme of the invention can form metal oxides (MgO and Mg (OH)) on the surface of the biochar2) Can improve the potential of adsorbing carbonate ions and reduce the CO of farmland soil2And (4) discharging the amount. Application of magnesium modified bamboo sawdust organismsThe carbon can effectively reduce the CO in the farmland soil2And the emission can also increase the carbon fixation of soil, improve the carbon trading volume and really realize the win-win of economy and environment.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 shows the CO content of the soil after the soil treatment of different experimental groups2Discharge rate versus curve;
FIG. 2 shows the CO content at 84 days after soil treatment in different experimental groups2A comparison plot of emissions;
FIG. 3 is a graph comparing DOC content of soil after soil treatment in different experimental groups;
FIG. 4 is a comparison of SOC content of soil after treatment of soil from different experimental groups;
FIG. 5 is a graph comparing the yield of corn seeds after different experimental groups treated corn planting soil.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be noted that the following examples are only illustrative of the present invention, and do not limit the scope of the present invention. Similarly, the following examples are only some but not all examples of the present invention, and all other examples obtained by those skilled in the art without any inventive work are within the scope of the present invention.
The following examples do not specify particular techniques or conditions, either according to the techniques or conditions described in the literature in the field or according to the product specifications. The reagents or instruments used are not indicated by manufacturers, and are all conventional products available on the market.
Example 1
The preparation method of the magnesium modified bamboo dust charcoal comprises the following steps:
(1) naturally air-drying the bamboo sawdust to reduce the water content to below 10%, then placing the air-dried bamboo sawdust under an oxygen-limited condition for high-temperature pyrolysis carbonization treatment, wherein the temperature of the pyrolysis carbonization treatment is 500 ℃, the heating rate is 10 ℃/m11, preserving the heat for 2 hours under the condition, then cooling to room temperature, grinding the product, and enabling the product to pass through a 100-mesh screen to obtain biochar;
(2) 203.2987g of MgCl were weighed2·6H2Adding deionized water to dissolve and fix the volume to 1000Ml, and preparing MgCl with the molar concentration of 1mol/L2·6H2O solution;
(3) mixing biochar obtained by sieving in the step (1) with 1mol/L MgCl2·6H2Mixing the O solution according to the solid-liquid ratio of 1:5, stirring the mixed system by an electromagnetic stirrer at the rotation speed of 180r/m11 for 1h, placing the mixed system in a constant temperature vibrator for oscillation treatment for 3h after stirring is finished, and enabling MgCl to be obtained2·6H2And fully reacting the O solution with the biochar, standing for 24 hours, filtering by using a 100-mesh screen, drying the filtrate in an oven environment at 105 ℃ for 12 hours, grinding the dried material, sieving by using the 100-mesh screen, and finally obtaining undersize to obtain the magnesium modified bamboo dust biochar.
Wherein, the drying in the step (3) is carried out in a drying oven at 105 ℃ with better drying effect and speed.
In addition, biochar is mixed with 1mol/L MgCl2·6H2The O solution can make the bamboo sawdust biochar in MgCl according to the solid-to-liquid ratio of 1:52·6H2Fully modified in O solution by adopting 1mol/L MgCl2·6H2MgCl which is too high or too low when O solution is used for modifying bamboo sawdust biochar2·6H2The O solution can increase the cost or reduce the modification effect of the biochar.
Performance characterization
The biochar prepared in the step (1) is characterized, and the result shows that the biochar is preparedThe pH value of the biochar is 9.4, the total carbon content is 775.00g/kg, the total nitrogen content is 4.00g/kg, the total phosphorus content is 2.20g/kg, the total potassium content is 4.10g/kg, and the specific surface area is 6.40m2/g。
Example 2
The application of the magnesium modified bamboo dust biochar in soil carbon sequestration and emission reduction in the embodiment, namely the method for reducing the CO2 emission and carbon sequestration of farmland soil by using the magnesium modified bamboo dust biochar comprises the following steps:
fertilizer: nitrogen (N), phosphorus (P)2O5) Potassium (K)2O) fertilizer is directly purchased from the market.
The method is implemented by adopting a field: the field test started in 3 months of 2021, and a test plot was established on a field in a corn growing area of white sand (26 ° 12 '13.428 "N, 119 ° 4' 40.584" E) in Fuzhou city, Fujian province, with a soil pH of 5.35 and a total carbon of 11.89 g.kg-11.05 g/kg of total nitrogen-150.67 mg/kg of alkaline hydrolysis nitrogen-1Quick-acting phosphorus 24.51 mg/kg-1Quick-acting potassium 25.47 mg/kg-1。
The test adopts random block design, each treatment is set with 3 times of repetition, 4 cells are totally, and the area of a single cell is 1.5m2Experimental group treatments included untreated soil as control (C), application of fertilizer only (F), bamboo sawdust biochar + fertilizer (BF), and magnesium modified bamboo sawdust biochar + fertilizer (MgOBF).
The biochar/modified biochar of example 1 was broadcast over the soil surface at 40 t.hm-2And uniformly mixing to a depth of about 20cm, and uniformly raking. Taking the same management measures, nitrogen (N), phosphorus (P)2O5) Potassium (K)2O) fertilizer application amount is respectively 150, 75 and 75 kg.hm-2。
Measuring CO of each cell by adopting open soil respiration measuring system2The rate of discharge, reported as Net Carbon Exchange Rate (NCER). The NCER was measured periodically from 3/21/2021 to 6/9 on days 3, 7, 14, 21, 22, 42, 56, 70 and 84 after the application of biochar. Selecting clear or cloudy weather, and determining the time as 8 a.m.: 00-12: 00, repeating the measurement 3 times for each cell, and obtaining the average value of the index.
During the measurement, the ring is used firstlyThe ambient gas purged the chamber to eliminate residual soil gas from previous experiments. The lid is then automatically closed and ambient air is pumped into the chamber at a set flow rate. CO in the Chamber2Increased concentration of CO in the soil2And after the flux is stable, setting the flow of the pump. Readings were automatically recorded every 10 seconds until the readings stabilized. Δ Cset and L1mT were set to 10 μmol. m, respectively-3And 10m 11. CO22The discharge rate (NCER) equation is as follows:
NCER＝[VP0/RS(T0+273.15)][dC/dt]
wherein, the NCER is the carbon dioxide flux rate of soil and the unit is mu mol.m-2·s-1(ii) a V is volume in cm3；P0Initial pressure in kPa; r is a universal gas constant; s is the soil surface area in cm2；T0Is the initial air temperature in units; dC/dt is the initial rate of change in the carbon dioxide mole fraction in units of. mu. mol-1·s-1。
The results are shown in FIG. 1, and it can be seen from FIG. 1 that there is a significant time difference between the NCER of each treatment. Experimental group F treatment accelerated CO in the first 14 days after soil improvement2And (4) discharging. After 14 days, BF treated CO was tested2The discharge rate increased significantly for up to 42 days. Experimental group MgOBF treatment of CO2The emission rate was also gradually increased, but the CO was treated in comparison to the experimental groups C and F2The discharge rate is lower. 42-70 days, Experimental group F and BF treated CO2The discharge rate decreases. With CO2Improvement of capture efficiency, MgOBF treatment of CO2The discharge rate continued to decrease from 56 days to the end of the experiment. And C, F and BF-treated CO2The discharge rate started to increase from 70 days. On day 84, the experimental group C, F, BF and MgOBF treated the CO2The discharge rates were 17.19, 15.41, 12.31. mu. mol.m, respectively-2.s-1And 7.60. mu. mol.m-2.s-1Experimental group MgOBF treatment of CO2The discharge rate was 55.79% lower than that of the C treatment, 50.68% lower than that of the test group F treatment, and 38.24% lower than that of the test group BF treatment. The magnesium modified bamboo dust charcoal can obviously reduce CO2Is discharged fromThe speed is increased, the carbon sink function of a farmland ecosystem is enhanced, and the emission reduction of agricultural greenhouse gases is realized.
Example 3
On the basis of example 2, the carbon emission of soil CO2 of different experimental groups is detected, wherein the soil CO is2Carbon emissions (carbo1 em1ss1o1, CE) are given by the equation:
in the formula: r is CO2Discharge Rate (. mu. mol. m)-2·s-1) (ii) a 1+1 and 1 represent the time between two measurements, t represents the number of days after sowing; the coefficient 0.1584 represents the C emissions in units of μmol CO2·m-2·s-1Conversion to g CO2·m-2·h-1The coefficient 0.2727 represents the unit g CO2·m-2·h-1Conversion to g C m-2·h-1(ii) a 24 and 10 denote C emissions in units of g C m-2·h-1Conversion to kg C.hm-2(ii) a Calculating CO at day 842And (4) discharging the amount. The results are shown in FIG. 2, from which it can be seen that the experimental group MgOBF treated CO2The emission is obviously reduced compared with C, F and BF treatment, and the experimental group MgOBF treats CO2The emission is reduced by 35.22% compared with the C treatment, by 25.17% compared with the F treatment and by 9.21% compared with the BF treatment. The addition of the biochar can reduce the CO in the farmland soil2Discharge amount of magnesium modified bamboo dust charcoal to soil CO2The promotion effect of emission reduction is the greatest.
Experimental group MgOBF treatment of CO2The discharge amount is reduced by 827.04kg C.hm compared with the treatment of the experimental group C-2(ii) a Compared with the F treatment, the treatment amount is reduced by 511.61kg of C.hm-2(ii) a Compared with BF treatment, the treatment amount is reduced by 154.33kg C.hm-2(ii) a The carbon value of carbon test point in China is 5.53042.02 yuan/ton, and MgOBF processing of experimental group can reach 4.57034.75 yuan/hm compared with C processing of carbon transaction2(ii) a The MgOBF processing of the experimental group can reach 2.83021.50 yuan/hm compared with the F processing of carbon transaction2(ii) a Compared with BF processing, MgOBF processing can reach 0.8506.48 yuan/hm2. Modification by application of magnesiumThe bamboo sawdust charcoal can improve the carbon trading volume, has good economic benefit and environmental benefit, and really realizes the win-win of economy and environment.
Example 4
On the basis of the above examples, soil samples of 0 to 20cm were collected on the 90 th day after the biochar and the magnesium-modified bamboo chips biochar in example 1 were taken. Then, soluble organic carbon (DOC) was measured by a hot water leaching-TOC analyzer, and Soil Organic Carbon (SOC) was measured by a potassium dichromate method, and the results are shown in fig. 3 and 4.
As can be seen from fig. 3, the application of magnesium modified bamboo bits biochar reduced soil DOC content. Compared with BF treatment, the DOC content of the soil treated by MgOBF in the experimental group is obviously reduced by 24.24%. The DOC content and C content in the MgOBF treatment of the experimental group have no obvious difference; the addition of the magnesium modified bamboo sawdust biochar inhibits the mineralization of active organic carbon in the soil, thereby reducing the CO in the soil2The amount of discharge of (c).
As can be seen from fig. 4, the application of magnesium modified bamboo dust biochar increased the soil SOC content. The SOC content of the soil treated by the experimental group MgOBF is 3.09 times and 3.06 times that of the soil treated by C, F respectively. Compared with BF treatment, the content of SOC in the soil is increased by 15.20% by MgOBF treatment of an experimental group. The magnesium modified bamboo sawdust biochar can promote the accumulation of organic carbon in soil and increase the carbon reservoir of the soil.
Example 5
On the basis of the above examples, soil was used for corn planting, and then the overground parts of corn were harvested at each treatment in the mature period (105 d after sowing), de-enzymed at 105 ℃ for 30m11, dried at 75 ℃ at constant temperature, threshed and weighed, and the yield was calculated, and the specific results are shown in fig. 5.
As can be seen in fig. 5, the application of magnesium modified bamboo dust biochar increased corn kernel yield. The yield of MgOBF treated grains in the experimental group is the highest, and is respectively and obviously increased by 3.90% and 7.83% compared with BF and F treatment. The magnesium modified bamboo dust charcoal has obvious effect of promoting the growth and development of the corn and has good economic benefit.
The comprehensive analysis of the results shows that the addition of the magnesium modified bamboo dust biochar has great significance for increasing the organic carbon reserve of soil, reducing the mineralization of the organic carbon in the soil and relieving global greenhouse effect.
The above description is only a part of the embodiments of the present invention, and not intended to limit the scope of the present invention, and all equivalent devices or equivalent processes performed by the present invention through the contents of the specification and the drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. The magnesium modified bamboo sawdust biochar is characterized in that bamboo sawdust with preset water content is subjected to high-temperature pyrolysis carbonization and cooling treatment, then ground to preset particle size, and ground products and MgCl with preset concentration are mixed2.6H2And O, filtering after mixing and contact treatment for a preset time, and drying, grinding and sieving the filtered matter to obtain undersize matters, thus obtaining the magnesium modified bamboo dust charcoal.
2. The preparation method of the magnesium modified bamboo sawdust biochar as claimed in claim 1, which comprises the following steps:
(1) processing bamboo scraps into bamboo scraps with the moisture content of below 10%, then placing the bamboo scraps under an oxygen-limited condition for high-temperature pyrolysis carbonization treatment, wherein the temperature of the pyrolysis carbonization treatment is 500 ℃, preserving heat for 2 hours under the condition, then cooling to room temperature, grinding a product, and enabling the product to pass through a 100-mesh screen to obtain biochar;
(2) MgCl with the molar concentration of 1mol/L is prepared2·6H2O solution;
(3) biochar is mixed with 1mol/L MgCl2·6H2Mixing the O solution according to the solid-liquid ratio of 1:5, stirring the mixed system to uniformly mix the O solution and the mixed system, placing the mixed system in a constant-temperature vibrator to vibrate for 3 hours, then standing for 24 hours, then filtering through a 100-mesh screen, placing the filtered matter in an environment of 105 ℃ to dry for 12 hours, then grinding the dried material and sieving through the 100-mesh screen to obtain the undersize product, and finally obtaining the magnesium modified bamboo dust charcoal.
3. The method for preparing magnesium-modified bamboo sawdust biochar as claimed in claim 2, wherein in step (1), the bamboo sawdust is processed by natural air drying to have a moisture content as low as 10% or less.
4. The method for preparing magnesium modified bamboo sawdust biochar as claimed in claim 2, wherein in step (1), the temperature rise rate of the pyrolysis carbonization treatment is 10 ℃/m 11.
5. The method for preparing magnesium modified bamboo sawdust biochar as claimed in claim 2, wherein in step (3), the rotation speed for stirring the mixed system is 180r/m11, and the stirring time is 1 h.
6. The method of preparing magnesium modified bamboo sawdust biochar as claimed in any one of claims 2 to 5, wherein the biochar prepared in step (1) has a pH of 9.4, a total carbon content of 775.00g/kg, a total nitrogen content of 4.00g/kg, a total phosphorus content of 2.20g/kg, a total potassium content of 4.10g/kg, and a specific surface area of 6.40m2/g。
7. The application of the magnesium modified bamboo dust charcoal in soil carbon fixation and emission reduction is characterized in that the magnesium modified bamboo dust charcoal prepared by the preparation method of any one of claims 2 to 6 is scattered in soil.
8. The use of the magnesium modified bamboo sawdust biochar as claimed in claim 7, wherein the amount of the magnesium modified bamboo sawdust biochar applied in soil is 40 t-hm-2After the application, the magnesium modified bamboo sawdust biochar is dispersed and mixed to the depth of 20cm of soil and is raked evenly.
9. The use of the magnesium modified bamboo sawdust biochar of claim 7 or 8, wherein the soil is corn planting soil.
10. Use of magnesium-modified bamboo sawdust biochar in corn planting improvement, characterized in that the magnesium-modified bamboo sawdust biochar prepared by the preparation method of any one of claims 2 to 6 is scattered in corn planting soil.
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