Application of transient electromagnetic pulse modified biochar in soil greenhouse gas emission reduction
Modifying biochar through transient electromagnetic pulse technology has solved the problem of improving soil improvement effect and pollution, significantly reducing greenhouse gas emissions, improving soil fertility and microbial activity, and enhancing crop yields.
Patent Information
- Application Number
- CN202411275011.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-12
- Publication Date
- 2024-12-13
- Estimated Expiration
- Not applicable · inactive patent
AI Technical Summary
The existing modified biochar has to be improved after preparation under different conditions, and secondary pollution may occur when used in soil, making it difficult to effectively reduce greenhouse gas emissions and improve soil fertility.
Transient electromagnetic pulse technology is used to modify biochar. By placing corn stalk biochar in different particle sizes in the transient electromagnetic pulse field, it increases its specific surface area and pore size, enriches functional groups, is used for soil improvement, reduces greenhouse gas emissions and Improve soil microbial activity.
Significantly reduce the emissions of CO2, N2O and CH4 in the soil, increase the carbon, nitrogen and phosphorus content of the soil, improve soil structure and permeability, promote microbial activities, increase crop yield and quality, and reduce the use of chemical fertilizers and pesticides.
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Figure CN119118751A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of modified biochar, and in particular to application of transient electromagnetic pulse modified biochar in reducing greenhouse gas emissions from soil. Background Art
[0002] Biochar is a general term for carbon-containing polymers produced by incomplete combustion of biomass (such as straw, weeds, wood and other agricultural and forestry wastes) under anaerobic conditions. Biochar has a highly aromatic structure, a porous surface and rich oxygen-containing functional groups, and has the characteristics of surface adsorption and stable chemical properties. Biochar itself is difficult to react with the surrounding environmental substances and disappear. Even through geological cycle processes such as sedimentation, burial, and weathering, it can still exist in large quantities in the atmosphere, soil, sediments, rocks, water bodies and ice bodies.
[0003] The main methods of biochar modification include surface oxidation with oxidants, impregnation with metal oxides, etc. The purpose is to enhance the functionality of the original biochar, so that the biochar has a larger specific surface area and oxygen-containing functional groups.
[0004] Unmodified biochar and modified biochar have excellent adsorption capacity and can adsorb and remove organic matter, heavy metal ions and other pollutants in water. The high specific surface area and rich pore structure of unmodified biochar provide a good adsorption platform, while modified biochar further improves the adsorption capacity and selectivity by introducing functional groups or changing the surface properties. This makes unmodified biochar and modified biochar have broad application prospects in water treatment, wastewater treatment, soil remediation and air pollution control.
[0005] Unmodified biochar and modified biochar also play an important role in soil improvement. They have good water retention and aeration, and can improve soil structure and soil water retention capacity. At the same time, unmodified biochar and modified biochar contain organic matter and trace elements, which can provide nutrients required for plant growth and promote the root development and absorption capacity of plants. In addition, the use of alkaline modified biochar in acidic soil can effectively adjust the soil pH value and provide a suitable growth environment. Therefore, unmodified biochar and modified biochar can be used to improve acidic soil, improve soil fertility, increase crop yields, etc.
[0006] Unmodified biochar and modified biochar also play a positive role in agricultural production. They can be used as soil conditioners or additives to provide nutrients, water retention and microbial activity required by plants, and improve soil quality and crop growth conditions. In addition, unmodified biochar and modified biochar can also be used in planting media for crops, such as soil conditioners, additives or seedling substrates. By adjusting and improving the soil environment, unmodified biochar and modified biochar can increase the yield and quality of crops, improve the nutrient utilization efficiency of the soil, and reduce the use of chemical fertilizers and pesticides.
[0007] There are many methods for modifying biochar, including physical modification (ball milling, gas activation, ultraviolet irradiation, etc.), chemical modification (acid, alkali, metal salt or other oxidants, etc.) and biological modification (addition of microorganisms, etc.). However, the modified biochar prepared under different conditions has problems such as the improvement effect on soil after being added to the soil, which needs to be improved. As an emerging physical field treatment process, electromagnetic pulse treatment introduces electromagnetic pulse energy into materials or parts in the form of pulsed current or pulsed magnetic field, so as to achieve the purpose of changing its microstructure, shape, mechanical properties, etc. No chemical substances are added during the electromagnetic pulse treatment process, so there will be no pollution problems. In addition, the electromagnetic pulse treatment time is short and the efficiency is high. Compared with unmodified biochar, the transient electromagnetic pulse modification used in the present invention can increase the specific surface area and pore size of biochar, increase the richness of functional groups, and no chemical reagents are used in the modification process, so no secondary pollution will be generated in the process of improving the soil.
[0008] Solving these problems and defects is of great significance to promote the application of modified biochar, which can play a greater role in environmental pollution control, soil improvement, agricultural production and other fields. Therefore, it is necessary to further study the preparation method of modified biochar, optimize the selection and use of modifiers, and improve the stability and performance of modified biochar to meet the growing application needs. Summary of the invention
[0009] The purpose of the present invention is to provide an application of transient electromagnetic pulse modified biochar in soil greenhouse gas emission reduction. Reasons such as unreasonable soil fertilization and excessive consumption of productivity have led to soil acidification, alkalization, salinization and other soil quality degradation. How to scientifically, rationally and sustainably develop and utilize land resources has become a major problem that needs to be solved urgently. Biochar, as a soil conditioner, provides a new direction for solving this problem. Compared with unmodified biochar, modified biochar has the characteristics of strong adsorption capacity and good fertilizer and water retention, and is widely used in soil repair and improvement. On the other hand, the preparation of biochar using agricultural straw, urban sludge and other biomass raw materials is a new way to reduce, harmlessly treat and resource-use wastewater and waste, which is of great significance to environmental protection and resource conservation.
[0010] The present invention utilizes transient electromagnetic pulses to modify biochar for soil improvement, which can reduce the cumulative greenhouse gas emissions from the soil and increase soil fertility; at the same time, the pore structure of biochar provides a good habitat for microorganisms, promotes the growth of microorganisms, prevents soil compaction, improves soil permeability and the metabolic process of microorganisms, thereby promoting the circulation of soil nutrient elements, improving soil fertility, and reducing greenhouse gas emissions.
[0011] In order to achieve the above technical objectives and the above technical effects, the present invention is implemented through the following technical solutions:
[0012] Application of transient electromagnetic pulse modified biochar in soil greenhouse gas emission reduction.
[0013] Furthermore, the application specifically includes: reducing the cumulative emissions of CO2, N2O and CH4 from the soil.
[0014] For biochar with particle size <0.154 mm, the modified biochar reduced CO2 emissions by 5.02%, N2O emissions by 52.16%, and CH4 emissions by 23.24%.
[0015] For biochar with a particle size of 0.5-1 mm, modified biochar can reduce CO2 emissions by 6.62%, N2O emissions by 44.11%, and CH4 emissions by 74.25%.
[0016] For biochar with a particle size of 1-2 mm, modified biochar can reduce CO2 emissions by 6.96%, N2O emissions by 17.65%, and CH4 emissions by 30.71%.
[0017] Application of transient electromagnetic pulse modified biochar in improving soil physical and chemical properties.
[0018] Furthermore, the application specifically includes: increasing the content of soil soluble organic carbon (DOC), ammonium nitrogen, nitrate nitrogen, nitrite nitrogen and available phosphorus.
[0019] On the other hand, the present invention proposes the above-mentioned method for modifying biochar by transient electromagnetic pulse, comprising: placing corn straw biochar with particle sizes of 0-0.154mm, 0.5-1mm, and 1-2mm in a transient electromagnetic pulse field, and pulse treating it for 3 hours under the conditions of frequency 140Hz and voltage 20kV.
[0020] Beneficial effects of the present invention:
[0021] Improve soil physical and chemical properties: Transient electromagnetic pulse modified biochar can increase the carbon, nitrogen and phosphorus content in the soil. Because of its rich pore structure, high specific surface area and adsorption, it can effectively adsorb and slow down the loss of these nutrients. In addition, modified biochar can also improve soil structure, increase soil permeability and water retention, increase soil porosity, and facilitate the growth of plant roots and gas exchange.
[0022] Promoting soil microbial activity: The rich oxygen-containing functional groups and carbon-based structures in transient electromagnetic pulse modified biochar provide a good biological activity environment, which can adsorb and protect microorganisms in the soil and promote the growth and activity of beneficial microorganisms in the soil. These microorganisms can produce beneficial substances such as soil enzymes, hormones and antibiotics, which play an important role in plant growth and nutrient circulation. In addition, modified biochar can also adsorb harmful microorganisms and inhibit soil pathogens and diseases.
[0023] Reduce greenhouse gas emissions: Transient electromagnetic pulse modified biochar has a high specific surface area and rich pore structure, which can effectively adsorb and store greenhouse gases such as CO2, N2O and CH4. This helps to reduce greenhouse gas emissions and alleviate environmental problems such as global warming. In addition, modified biochar can also increase the metabolic activity of microorganisms in the soil and promote the biological transformation and removal of greenhouse gases.
[0024] Improve crop yield and quality: Transient electromagnetic pulse modified biochar improves the effectiveness and availability of nutrients in the soil by improving soil quality and nutritional status. This is very important for increasing the ability of crops to absorb and utilize nutrients, thereby improving crop yield and quality. In addition, modified biochar can also adsorb and stabilize pesticides and heavy metal ions in the soil, reducing their pollution and toxicity to crops.
[0025] In summary, transient electromagnetic pulse modified biochar has broad application prospects in soil improvement and agricultural production. It can improve soil physical and chemical properties, promote soil microbial activity, reduce soil acidification risks, reduce greenhouse gas emissions and increase crop yield and quality. The transient electromagnetic pulse modified biochar proposed in the present invention has important application potential and driving role in the fields of environmental governance, soil remediation, water treatment and agricultural production.
[0026] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS
[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for describing the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.
[0028] Figure 1 It is a schematic diagram of the overall technical route of the present invention;
[0029] Figure 2 Schematic diagram of scanning electron microscopy of biochar before and after modification of the present invention, (a)-(f) correspond to the six groups of samples in Example 2 respectively;
[0030] Figure 3 This is a schematic diagram of the modified biochar mixed soil culture of the present invention;
[0031] Figure 4 This is a schematic diagram of greenhouse gas collection in the present invention;
[0032] Figure 5 This is a schematic diagram of greenhouse gas measurement according to the present invention. DETAILED DESCRIPTION
[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0034] Example 1
[0035] This embodiment describes an application of transient electromagnetic pulse modified biochar in soil greenhouse gas emission reduction.
[0036] In this embodiment, the application specifically includes: reducing the cumulative emissions of CO2, N2O and CH4.
[0037] Compared with unmodified biochar, for biochar with particle size <0.154mm, modified biochar can reduce CO2 emissions by 5.02%, N2O emissions by 52.16%, and CH4 emissions by 23.24%; for biochar with particle size 0.5-1mm, modified biochar can reduce CO2 emissions by 6.62%, N2O emissions by 44.11%, and CH4 emissions by 74.25%; for biochar with particle size 1-2mm, modified biochar can reduce CO2 emissions by 6.96%, N2O emissions by 17.65%, and CH4 emissions by 30.71%.
[0038] Application of transient electromagnetic pulse modified biochar in improving soil physical and chemical properties.
[0039] In this embodiment, the application specifically includes: increasing the content of soil soluble organic carbon (DOC), ammonium nitrogen, nitrate nitrogen, nitrite nitrogen and available phosphorus.
[0040] On the other hand, the present invention proposes the above-mentioned method for modifying biochar by transient electromagnetic pulse, comprising: placing corn straw biochar with particle sizes <0.154mm, 0.5-1mm, and 1-2mm in a transient electromagnetic pulse field, and pulse treating it for 3 hours under the conditions of frequency 140Hz and voltage 20kV.
[0041] Example 2
[0042] Experimental Materials:
[0043] 1 mol / L potassium chloride solution; hydrochloric acid; 0.5 mol / L sodium bicarbonate solution; glucose solution; potassium nitrate solution; ammonium chloride solution; soil (taken from Ma Ming Township, Qujing City, Yunnan Province).
[0044] The soil used in the experiment was taken from Ma Ming Township, Qujing City, Yunnan Province. The soil was relatively poor artificial grassland soil.
[0045] Experimental equipment:
[0046] 250mL culture bottle, gas chromatograph; fully automatic non-stop chemical analyzer; TOC analyzer.
[0047] Experimental design
[0048] 1. Experiments on determination of soil physical and chemical properties
[0049] The present invention mainly determines the changes in ammonium nitrogen, nitrate nitrogen, nitrite nitrogen, available phosphorus and soluble organic carbon in the soil in the experimental aspect of determining the physical and chemical properties of the soil. When determining the ammonium nitrogen, nitrate nitrogen, nitrite nitrogen and available phosphorus, the soil is extracted and then determined using a full-automatic uninterrupted chemical analyzer; when determining the soluble organic carbon, the soil is also extracted and determined using a TOC analyzer.
[0050] The specific experimental design is:
[0051] (1) Sample preparation
[0052] First, the sample was prepared. The collected fresh soil samples were sieved through a 5mm-3mm sieve to remove stones and debris, mixed manually or by instrument, and stored at 4°C. At the same time, the soil moisture content was measured. According to the different treatments and different particle sizes of biochar, they were grouped into a control group, an unmodified biochar group, and a transient electromagnetic pulse modified biochar group with different particle sizes. After that, they were cultured in culture bottles. Two experiments on soil physical and chemical properties were conducted during the substrate-free culture period. The soil physical and chemical properties were measured on the 0th, 7th, 15th, and 21st days during the 21d culture period.
[0053] (2) Extraction operation
[0054] After the sample preparation is completed, the sample is first subjected to leaching operation. When determining ammonium nitrogen, nitrate nitrogen, and nitrite nitrogen, weigh 10.00g of the sample (accurately weighed), place it in a dry leaching bottle, add 50.00mL of leaching agent (1mol / L potassium chloride solution), cover the lid tightly, place it on a constant temperature reciprocating oscillator, oscillate at a frequency of 180-220r / min at 25±1℃ for 60±1min, take it out and let it stand, after the suspension is clarified, the supernatant is immediately filtered with filter paper, and the filtrate is passed through a 0.45μm (or 0.22μm aqueous filter membrane). The filtrate should be analyzed on the same day, otherwise it should be stored at -20℃. When determining available phosphorus, weigh 2.50g of sample (accurately weighed), place it in a dry extraction bottle, add 50.00mL of extraction agent (0.5mol / L sodium bicarbonate solution), cover the lid, place it on a constant temperature reciprocating oscillator, oscillate at 25±1℃ with an oscillation frequency of 180-220r / min for 30±1min, take it out and let it stand, after the suspension is clarified, the supernatant is immediately filtered with filter paper, and the filtrate is passed through 0.45μm (or 0.22μm aqueous filter membrane). The filtrate should be analyzed on the same day, otherwise it should be stored at -20℃. At the same time, do a blank experiment. When calculating the results at the end, the sample results should be deducted from the blank results to obtain the actual sample results.
[0055] (3) Sample processing
[0056] When determining ammonium nitrogen, nitrate nitrogen, nitrite nitrogen and available phosphorus, the soil sample is extracted and then operated using a non-stop chemical analyzer. The soil sample during the experiment should be repeated no less than three times.
[0057] When determining soluble organic carbon, the soil sample is extracted and then operated using a TOC analyzer. The soil samples during the experiment are also repeated no less than five times.
[0058] 2. Determination of greenhouse gases
[0059] According to different treatments and different particle sizes of biochar, they were grouped into control group, unmodified biochar group and transient electromagnetic pulse modified biochar group. The samples of each particle size in each group were repeated no less than six times. 25g soil (dry weight) and 0.25g biochar were mixed, and the soil was pre-cultured for 3 days to stabilize soil metabolism. After mixing, 25g soil (dry weight) was weighed and placed in a 250mL culture bottle. After that, the bottle cap was covered and placed in a biological incubator at 19.8℃ for culture. First, a 6-day substrate-free culture was carried out. During the six-day culture period, the headspace gas (25mL) of the culture bottle was collected every day with a syringe. After that, a 21-day culture was carried out with the addition of substrates, which were carbon and nitrogen sources, that is, the carbon source: glucose 100 mg C / kg dry soil, the nitrogen source: potassium nitrate 25 mg N / kg dry soil, and ammonium chloride 25 mg N / kg dry soil were added to the culture bottle. The headspace gas (25 mL) of the culture bottle was collected with a syringe on the 0th, 1st, 2nd, 3rd, 7th, 10th, 15th, and 21st days of the culture period, and the CO2, N2O, and CH4 concentrations were measured by gas chromatography immediately after collection. After gas sampling, the bottle cap was opened for 20 minutes to ensure that the gas accumulated in the bottle was discharged, and the above treatment steps were continued after sealing.
[0060] Parameters in the table:
[0061] CK: No biochar was added to the soil.
[0062] BC <0.154 : Unmodified corn straw biochar, particle size <0.154mm
[0063] BC 0.5-1 : Unmodified corn straw biochar, particle size 0.5-1mm
[0064] BC 1-2 : Unmodified corn straw biochar, particle size 1-2mm
[0065] EBC <0.154 :Transient electromagnetic pulse modified corn straw biochar, particle size <0.154mm EBC 0.5-1 :Transient electromagnetic pulse modified corn straw biochar, particle size 0.5-1mm EBC 1-2 :Transient electromagnetic pulse modified corn straw biochar, particle size 1-2mm
[0066] Example 3
[0067] Effects of transient electromagnetic pulse modified biochar on cumulative greenhouse gas emissions from soil
[0068] 1. Cultivation without adding substrate
[0069] Cumulative greenhouse gas emissions
[0070] Compared with the control:
[0071] Modified biochar with particle size <0.154mm reduced soil CO2 emissions by 11.28%, increased N2O emissions by 67.22%, and reduced CH4 emissions by 9.63%; modified biochar with particle size 0.5-1mm reduced CO2 emissions by 14.62%, increased N2O emissions by 66.84%, and reduced CH4 emissions by 8.30%; biochar with particle size 1-2mm reduced CO2 emissions by 27.77%, increased N2O emissions by 53.85%, and increased CH4 emissions by 1.97%.
[0072] Compared with unmodified biochar:
[0073] Modified biochar with particle size <0.154mm reduced soil CO2 emissions by 28.31%, increased N2O emissions by 97.90%, and reduced CH4 emissions by 12.73%; modified biochar with particle size 0.5-1mm increased CO2 emissions by 0.75%, reduced N2O emissions by 5.26%, and reduced CH4 emissions by 28.57%; biochar with particle size 1-2mm reduced CO2 emissions by 12.01%, N2O emissions by 4.25%, and increased CH4 emissions by 22.97%.
[0074] Table 1 Cumulative emissions of greenhouse gases
[0075] Biochar <![CDATA[CO2(μg / kgsoil)]]> <![CDATA[N2O(ng·kg -1 soil)]]> <![CDATA[CH4(ng·kg -1 soil)]]> CK 140.981 3.206 4.259 <![CDATA[BC <0.154 ]]> 174.546 2.709 4.113 <![CDATA[BC 0.5-1 ]]> 119.540 5.646 3.038 <![CDATA[BC 1-2 ]]> 115.696 5.152 3.395 <![CDATA[EBC <0.154 ]]> 106.131 5.357 3.488 <![CDATA[EBC 0.5-1 ]]> 125.078 5.361 3.717 <![CDATA[EBC 1-2 ]]> 120.372 5.349 3.906
[0076] 2. Add substrate for cultivation
[0077] Compared with the control:
[0078] Modified biochar with particle size <0.154mm reduced soil CO2 emissions by 1.69%, N2O emissions by 50.67%, and CH4 emissions by 32.11%; modified biochar with particle size 0.5-1mm reduced soil CO2 emissions by 5.73%, N2O emissions by 41.75%, and increased CH4 emissions by 60.31%; modified biochar with particle size 1-2mm reduced soil CO2 emissions by 13.64%, N2O emissions by 47.48%, and CH4 emissions by 8.85%.
[0079] Compared with unmodified biochar:
[0080] Modified biochar with particle size <0.154mm reduced soil CO2 emissions by 5.02%, N2O emissions by 52.16%, and CH4 emissions by 23.24%; modified biochar with particle size 0.5-1mm reduced soil CO2 emissions by 6.62%, N2O emissions by 44.11%, and CH4 emissions by 74.25%; modified biochar with particle size 1-2mm reduced soil CO2 emissions by 6.96%, N2O emissions by 17.65%, and CH4 emissions by 30.71%.
[0081] Table 2 Cumulative emissions of greenhouse gases
[0082] Biochar <![CDATA[CO2(μg / kgsoil)]]> <![CDATA[N2O(μg / kgsoil)]]> <![CDATA[CH4(ng / kgsoil)]]> CK 769.1 0.081 4.007 <![CDATA[BC <0.154 ]]> 796.1 0.083 6.896 <![CDATA[BC 0.5-1 ]]> 776.5 0.084 6.176 <![CDATA[BC 1-2 ]]> 713.9 0.051 6.295 <![CDATA[EBC <0.154 ]]> 756.1 0.04 5.293 <![CDATA[EBC 0.5-1 ]]> 725.1 0.047 1.59 <![CDATA[EBC 1-2 ]]> 664.3 0.042 4.361
[0083] Effects of transient electromagnetic pulse modified biochar on soil physical and chemical properties
[0084] 1. Cultivation without substrate
[0085] Compared with control
[0086] Modified biochar with particle size <0.154mm increased the DOC content by 0.298mg / kg, an increase of 38.02%; the available phosphorus content increased by 2.100mg / kg, an increase of 11.32%; the nitrate nitrogen content decreased by 0.978mg / kg, a decrease of 8.89%; the nitrite nitrogen content decreased by 0.008mg / kg, a decrease of 10.27%; and the ammonium nitrogen content decreased by 0.781mg / kg, a decrease of 35.10%.
[0087] Modified biochar with a particle size of 0.5-1mm can increase the DOC content by 0.456mg / kg, an increase of 58.22%; reduce the available phosphorus content by 0.658mg / kg, a decrease of 3.55%; reduce the nitrate nitrogen content by 1.091mg / kg, a decrease of 9.91%; reduce the nitrite nitrogen content by 0.008mg / kg, a decrease of 9.96%; and reduce the ammonium nitrogen content by 0.529mg / kg, a decrease of 23.77%.
[0088] Modified biochar with a particle size of 1-2 mm can increase the DOC content by 0.328 mg / kg, an increase of 41.80%; reduce the available phosphorus content by 1.304 mg / kg, a decrease of 7.03%; increase the nitrate nitrogen content by 0.551 mg / kg, an increase of 5.01%; reduce the nitrite nitrogen content by 0.012 mg / kg, a decrease of 14.58%; and reduce the ammonium nitrogen content by 0.847 mg / kg, a decrease of 38.10%.
[0089] Compared with unmodified biochar
[0090] The modified biochar with particle size <0.154mm increased the DOC content by 0.043mg / kg, an increase of 4.13%; the available phosphorus content decreased by 0.021mg / kg, a decrease of 0.10%; the nitrate nitrogen content decreased by 0.517mg / kg, a decrease of 4.90%; the nitrite nitrogen content increased by 0.250μg / kg, a decrease of 0.34%; the ammonium nitrogen content decreased by 0.473mg / kg, a decrease of 24.67%;
[0091] The modified biochar with a particle size of 0.5-1 mm increased the DOC content by 0.216 mg / kg, an increase of 21.06%; the available phosphorus content increased by 0.693 mg / kg, an increase of 3.87%; the nitrate nitrogen content decreased by 0.365 mg / kg, a decrease of 3.55%; the nitrite nitrogen content decreased by 0.250 μg / kg, a decrease of 0.34%; the ammonium nitrogen content decreased by 0.389 mg / kg, a decrease of 18.65%;
[0092] The modified organisms with a particle size of 1-2 mm increased the DOC content by 0.288 mg / kg, an increase of 35.04%; the available phosphorus content increased by 0.467 mg / kg, an increase of 2.71%; the nitrate nitrogen content decreased by 0.015 mg / kg, a decrease of 0.14%; the nitrite nitrogen content decreased by 1.083 μg / kg, a decrease of 1.54%; and the ammonium nitrogen content decreased by 0.830 mg / kg, a decrease of 37.60%.
[0093] Table 3 Physical and chemical properties of soil
[0094]
[0095]
[0096] 2. Add substrate for cultivation
[0097] Table 4 Physical and chemical properties of soil
[0098]
[0099] Compared with the control,
[0100] Modified biochar with particle size <0.154mm increased the DOC content by 0.084mg / kg, an increase of 9.11%; the available phosphorus content increased by 1.078mg / kg, an increase of 6.83%; the nitrate nitrogen content increased by 0.992μg / kg, an increase of 0.004%; the nitrite nitrogen content increased by 5.25μg / kg, an increase of 7.35%; and the ammonium nitrogen content decreased by 0.073mg / kg, a decrease of 5.91%.
[0101] The modified biochar with a particle size of 0.5-1mm increased the DOC content by 0.093mg / kg, an increase of 10.09%; the available phosphorus content increased by 1.101mg / kg, an increase of 6.97%; the nitrate nitrogen content decreased by 3.967μg / kg, a decrease of 0.016%; the nitrite nitrogen content decreased by 3.417μg / kg, a decrease of 4.78%; and the ammonium nitrogen content decreased by 0.019mg / kg, a decrease of 1.54%.
[0102] Modified biochar with a particle size of 1-2 mm increased the DOC content by 0.302 mg / kg, an increase of 30.44%; the available phosphorus content increased by 1.285 mg / kg, an increase of 8.14%; the nitrate nitrogen content decreased by 2.975 μg / kg, a decrease of 0.012%; the nitrite nitrogen content decreased by 3.417 μg / kg, a decrease of 4.78%; and the ammonium nitrogen content increased by 0.253 mg / kg, an increase of 20.49%.
[0103] Compared with unmodified biochar,
[0104] Modified biochar with particle size <0.154mm increased the DOC content by 0.230mg / kg, an increase of 22.86%; reduced the available phosphorus content by 0.849mg / kg, a decrease of 4.79%; reduced the nitrate nitrogen content by 2.975μg / kg, a decrease of 0.01%; reduced the nitrite nitrogen content by 6.833μg / kg, a decrease of 8.87%; and reduced the ammonium nitrogen content by 0.381mg / kg, a decrease of 32.79%.
[0105] The modified biochar with a particle size of 0.5-1mm increased the DOC content by 0.129mg / kg, an increase of 12.71%; the available phosphorus content increased by 2.226mg / kg, an increase of 15.18%; the nitrate nitrogen content increased by 0.992μg / kg, an increase of 0.004%; the nitrite nitrogen content increased by 4.417μg / kg, an increase of 6.50%; and the ammonium nitrogen content decreased by 0.143mg / kg, a decrease of 11.76%.
[0106] The modified biochar with a particle size of 1-2 mm increased the DOC content by 0.137 mg / kg, an increase of 12.60%; the available phosphorus content increased by 0.761 mg / kg, an increase of 4.66%; the nitrate nitrogen content increased by 6.942 μg / kg, an increase of 0.03%; the nitrite nitrogen content increased by 1.500 μg / kg, an increase of 2.21%; and the ammonium nitrogen content decreased by 0.658 mg / kg, a decrease of 44.22%.
[0107] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific implementation methods described. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.
Claims
1. Application of transient electromagnetic pulse modified biochar in soil greenhouse gas emission reduction.
2. The use according to claim 1, characterized in that: The application specifically includes: reducing the cumulative emissions of CO2, N2O and CH4 from the soil.
3. Application of transient electromagnetic pulse modified biochar in improving soil physical and chemical properties.
4. The application according to claim 3, wherein the application specifically comprises: Increase the content of soluble organic carbon, nitrate nitrogen and available phosphorus in the soil.
5. The method for modifying biochar by transient electromagnetic pulse according to any one of claims 1 to 4, characterized in that: include: Biochar with particle sizes of 0-0.154 mm, 0.5-1 mm, and 1-2 mm was placed in a transient electromagnetic pulse field and pulsed for 3 hours at a frequency of 140 Hz and a voltage of 20 kV.