A soil improvement material and its ecological preparation method and application

Abstract

The present invention provides a soil improvement material and its ecological preparation method and application. Specifically, the preparation method of the soil improvement material uses industrial solid wastes such as gangue, steel slag, fly ash, and slag; urban solid wastes such as kitchen waste and municipal sludge; and agricultural solid wastes such as straw and feces as the main raw materials. The flue gas components and waste heat from the pyrolysis of the solid waste are fully utilized to prepare micropowders and ultrafine powders for air separation and classification. A mycorrhizal fungus composite inoculant is used to enhance the adaptability, stress resistance, disease resistance, and penetrability of the host plant. During the growth and development of the host plant, carbon is fixed through photosynthesis. The root system and the rhizosphere ecosystem not only increase the nutrient and organic matter content in the soil, but also produce a rich community of beneficial microorganisms. The preparation process is green and low-carbon, and the resulting soil improvement material has a good quality-enhancing effect and significant overall benefits.

Description

Technical Field

[0001] The invention belongs to the field of soil improvement material preparation, and in particular relates to a soil improvement material prepared by utilizing solid waste from industrial and agricultural production and residents' daily life. Background Art

[0002] On the one hand, site restoration, watershed management and landscaping projects often require the excavation of "good soil" such as loess and nutrient soil for soil reconstruction, landform reshaping or surface covering, which will inevitably damage the ecological environment of the land extraction site; on the other hand, the long-term storage of large amounts of multi-source solid waste from production and life, such as coal gangue and sludge, occupies a large amount of land and continuously pollutes the environment; therefore, the idea of ​​using multi-source solid waste to manufacture artificial soil and other soil materials for site restoration, watershed management and landscaping projects is proposed.

[0003] In the existing technology, the technology of using multi-source solid waste to manufacture soil materials such as artificial soil mainly focuses on grading. After crushing and screening solid wastes such as gangue and construction waste, the grading is carried out to meet the requirements of ventilation porosity and matrix texture. The matrix is ​​passivated by adding municipal and agricultural solid wastes and functional bacteria to convert the organic matter and available nitrogen, phosphorus and potassium components. However, due to the low content of organic carbon and nutrients in raw materials such as gangue, the bacteria are sensitive to environmental influences and cannot be effective for a long time, resulting in poor soil quality improvement effect. In addition, large amounts of artificial soil stockpiles also have the problems of occupying land and raising dust. Therefore, there is an urgent need for a preparation method and soil improvement material for preparing soil improvement materials from multi-source solid waste that is green, low-carbon, has good soil quality improvement effect, and has significant comprehensive benefits. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing soil improvement materials prepared from multi-source solid wastes, which is green, low-carbon, has good soil quality improvement effect and significant comprehensive benefits, and a soil improvement material.

[0005] The present invention provides a method for preparing a soil improvement material, comprising the following steps in sequence:

[0006] S1: Urban solid waste such as kitchen waste and municipal sludge, and agricultural solid waste such as straw and feces are turned by a turner or mixed by a blender, briquette pressed by a briquette press, and pyrolyzed in a pyrolysis furnace at 400-700°C to produce biochar. The acidic gas containing biovinegar and biotar generated during the pyrolysis process is recovered, as well as the heat and water vapor generated during the pyrolysis process.

[0007] S2: crushing industrial solid wastes such as gangue, steel slag, fly ash, and slag using a jaw crusher or hammer crusher, removing iron using a deironing device, removing impurities using a 30-50 mm aperture vibrating screen or sliding screen, and sieving using a 40-mesh vibrating screen to obtain particles with a mesh size of 40 or less as raw materials for standby use; the particles with a mesh size of 40 or greater obtained by sieving are fed into a pulverizer for pulverization and classification, and simultaneously introduced into the pyrolysis acidic flue gas and water vapor generated in S1 for modification and activation to prepare fine powder with a particle size of 10-75 μm and ultrafine powder with a particle size of less than 10 μm;

[0008] S3: The biochar prepared in step S1, the particles of 40 mesh or less obtained in step S2, the fine powder and ultrafine powder prepared in step S2 are graded as needed, cyclically crushed and screened, and homogenized. The products are spread to form a base. The biochar content in the base can be 0. The base thickness is calculated using the formula H = h × k, where:

[0009] H - base thickness, in m,

[0010] h - the maximum average root length of various host plants planted, in meters,

[0011] k-penetration coefficient, the value of k is 1.2-1.5;

[0012] S4: Spread the base fertilizer Ca(H2PO4)2 or KH2PO4 about 5-10g / m on the substrate of step S3 2 , urea 10-20g / m 2 , forming a base fertilizer layer;

[0013] S5: Laying a second interlayer with a thickness of 5-10 cm on the base fertilizer layer of step S4. The composition of the second interlayer is the same as that of the base. The content of biochar, micropowder and ultrafine powder in the second interlayer is higher than that of the base. The content of biochar in the base can be 0.

[0014] S6: Spreading a mycorrhizal fungus composite agent on the upper portion of the second barrier layer in step S5;

[0015] S7: laying a 5-10 cm thick interlayer 1 on top of the mycorrhizal fungus composite inoculant of step S6, wherein the composition of the interlayer 1 is the same as that of the substrate, and the content of biochar, micropowder, and ultrafine powder in the interlayer 1 is higher than that of the biochar, micropowder, and ultrafine powder in the substrate, and then planting or transplanting mycorrhizal fungus-dependent pioneer plants on the interlayer 1 to build a green bank;

[0016] S8: Planting management: When the plant has two true leaves, all seedlings are emerging, the seedlings are in good condition, and the growth is vigorous, add a concentration of about 3‰-5‰ of bio-vinegar to the surface of the green storage, and water it every other day at a concentration of 1-3L / m 2Repeat once a week for 2-3 weeks; add water-soluble nitrogen fertilizer every other week after applying bio-vinegar for a total of 4-6 weeks;

[0017] S9: Harvest part or all of the above-ground parts of the plant every 3-6 months and process them into biochar, biovinegar, and biotar using a pyrolysis furnace;

[0018] S10: Continue to store the green storage soil and continue to mature it; or take soil, screen it, mix it evenly, add corresponding microbial agents and nutrients to condition it according to market demand, and produce green and low-carbon soil improvers, soil conditioners, soil purification materials, and organic fertilizers.

[0019] In the method for preparing soil improvement materials of the present invention, in step S2, the pulverizing / grading equipment is selected from any one of a jet mill, a steam mill, a ball mill, or a Raymond mill. The equipment is required to be corrosion-resistant and equipped with a wet electrostatic precipitator or an acid-resistant and moisture-resistant bag dust collector to collect the product of step S2.

[0020] The method for preparing a soil improvement material of the present invention, wherein in step S2, the pulverizing / grading equipment is selected from any one of a medium-speed mill, a Raymond mill, and a ball mill, and the particles produced are flat flakes; the pulverizing / grading equipment is selected from one of a jet mill and a steam mill, and the particles produced are polyhedrons.

[0021] In the method for preparing the soil improvement material of the present invention, in step S2, the acidic gas and the water vapor are both products of the pyrolysis process in step S1.

[0022] The preparation method of the soil improvement material of the present invention, wherein, in the step S6, the mycorrhizal fungal composite agent is composed of mycorrhizal fungi, rhizosphere growth-promoting bacteria, pythium, a water-retaining agent and a carbon-based supporting adsorption material.

[0023] The preparation method of the soil improvement material of the present invention, wherein in the step S6, the mycorrhizal fungus composite agent and one of nutrient soil, peat soil or weathered coal are evenly mixed at a mass ratio of 1:1000 per square meter of the second interlayer, and after thorough dispersion, are evenly spread on the second interlayer, wherein the amount of the mycorrhizal fungus composite agent is 0.1-5g, and the amount of one of the nutrient soil, peat soil or weathered coal is 0.1-5kg.

[0024] The method for preparing the soil improvement material of the present invention, wherein, in step S7, when planting or transplanting plants, the seeds or plant branches are treated with a mycorrhizal fungus composite agent, the seeds need to be coated and mixed, and the branches need to be root dipped.

[0025] The preparation method of the soil improvement material of the present invention, wherein, during the construction of the green storage in step S7, a root drip irrigation and oxygenation system is selected, and a sampling corridor is constructed and equipped with a solar auxiliary light source system to promote plant development, soil maturation and prevention and control of pests and diseases.

[0026] The present invention provides a soil improvement material, which is prepared by any of the above-mentioned methods for preparing soil improvement materials.

[0027] The present invention provides an application of the soil improvement material as described above.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] The present invention uses industrial solid wastes such as gangue, steel slag, fly ash, slag, urban solid wastes such as kitchen waste, municipal sludge, and agricultural solid wastes such as straw and feces as main raw materials. The flue gas (acidic water-containing gas, including a small amount of bio-tar-BT and bio-vinegar-BV) generated by pyrolysis of briquetting materials such as kitchen waste, sludge, straw, and feces is used for air distribution and air separation after Raymond mill or medium-speed mill or air flow milling to produce fine powder, making full use of the waste heat of the flue gas, and the components are mixed, reacted, and separated with gangue, steel slag, fly ash, slag, etc. during the grinding process. Homogenization, loading, adjustment of the pH value and physical and chemical properties of the powder, followed by air separation and classification, to form powders (micropowder, ultrafine powder) of different physical properties and particle sizes for use. The use of mycorrhizal fungi composite agents can enhance the adaptability, stress resistance, disease resistance and penetrability of the host plant, accelerate the decomposition of nutrients and organic matter in the soil, and enhance the soil maturation process; during the growth and development of the host plant, carbon is fixed through photosynthesis, and its root system and root-surrounding life community not only increase the organic matter content in the soil, but also produce rich beneficial microbial communities. The host plant's above-ground objects are processed into biochar and biovinegar, etc., which, on the one hand, improve the water and fertilizer conditions; on the other hand, the quantitative use of biovinegar and biotar is used to promote plant growth and control pests and diseases. Through the combination of deep-rooted host plants, mycorrhizal fungi, biochar and micropowder and ultrafine powder, the oxygen conduction to the deep layer of the matrix (0.5-2.5 meters) is enhanced, the improvement of the green reservoir soil quality is accelerated, the soil quality improvement effect is good, and green and low-carbon soil improvers, soil conditioners, soil purification materials, organic fertilizers and other soil improvement materials are produced; the soil improvement materials can be packaged and sold according to market demand, saving space and having significant comprehensive benefits.

[0030] The present invention will be further described below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A flow chart of a method for preparing a soil improvement material according to the present invention;

[0032] Figure 2 It is a structural diagram of the green bank in the present invention. DETAILED DESCRIPTION

[0033] The embodiments of the present invention will be described clearly and in detail below. Contents not described in detail in the embodiments of the present invention belong to the prior art known to those of ordinary skill in the art.

[0034] like Figure 1 As shown, the preparation method of the soil improvement material of the present invention comprises the following steps:

[0035] S1: Urban solid waste such as kitchen waste and municipal sludge and agricultural solid waste such as straw and feces are turned by a turner or mixed by a mixer, briquette machine, and pyrolyzed in a pyrolysis furnace at a temperature of 400-700℃ to produce biochar (BC). The pyrolysis process produces acidic gas (including biovinegar "BV" and biotar "BT"), and the heat and water vapor generated by the pyrolysis process are recovered.

[0036] S2: Use a jaw crusher or hammer crusher to crush industrial solid waste such as gangue, steel slag, fly ash, and slag, remove iron using a deironing device, remove impurities using a vibrating screen or sliding screen with a 30-50mm aperture, and screen using a 40-mesh vibrating screen. The particles obtained by screening are less than or equal to 40 mesh and used as raw materials for standby use; the particles larger than 40 mesh obtained by screening are sent to a grinding machine for pulverization and classification, and the pyrolysis acidic flue gas and water vapor generated in S1 are introduced for modification and activation to prepare micropowder and ultrafine powder (micropowder particle size 10-75μm, ultrafine powder particle size <10μm). The preferred pulverizing / grading equipment is air jet mill or steam mill to obtain three-dimensional solid particles. Secondly, the particles produced by medium-speed mill, Raymond mill, and ball mill are mostly flat flakes.

[0037] S3: The biochar (BC) produced in step S1, the particles of 40 mesh or less produced in step S2, the fine powder and ultrafine powder produced in step S2 are graded as needed, cyclically crushed and screened, and homogenized. The product is spread to form a base. The biochar content in the base can be 0. The base thickness is selected based on the local natural phenology and the target planting conditions. The host plant with the longest average root depth is selected as h, and is calculated using the formula H = h × k, where:

[0038] H - base thickness, in m,

[0039] h - the maximum average root length of various host plants planted (usually multiple host plants are planted, and the average root lengths of various plants are different, so the maximum average length is selected as h), in meters.

[0040] k - penetration coefficient, the value of k is 1.2-1.5 (dimensionless).

[0041] S4: Spread base fertilizer Ca(H2PO4)2 or KH2PO4 about 5-10g / m on the base in step S3 2, urea 10-20g / m 2 , forming the base fertilizer layer.

[0042] S5: A second interlayer with a thickness of 5-10 cm is laid on top of the base fertilizer layer in step S4. The composition of the second interlayer is the same as that of the base. The content of biochar, micropowder and ultrafine powder in the second interlayer is higher than that of the base. The content of biochar in the base can be 0.

[0043] S6: Evenly spread a mycorrhizal fungus composite inoculant over the second interlayer of step S5. For each square meter of interlayer 2, disperse 0.1-5 g of the mycorrhizal fungus composite inoculant with 1-5 kg ​​of loess, nutrient soil, peat soil, or weathered coal, and evenly spread the mixture. The mycorrhizal fungus composite inoculant comprises mycorrhizal fungi, rhizosphere growth-promoting bacteria, pythium, a water-retaining agent, and a carbon-based carrier adsorption material.

[0044] S7: A 5-10 cm thick interlayer is laid on top of the mycorrhizal fungus composite agent in step S6. The composition of interlayer one is the same as that of the substrate, and the content of biochar, micropowder and ultrafine powder in interlayer one is higher than that of biochar, micropowder and ultrafine powder in the substrate. Then, mycorrhizal fungus-dependent pioneer plants (including but not limited to alfalfa, clover, wheat straw, Amorpha fruticosa, vetiver, etc.) are planted on interlayer one. The planted plants are treated with the mycorrhizal fungus composite agent, the seeds are coated and mixed, and the branches are dipped in roots to build a green storage system. The structure is shown in FIG. Figure 2 , the formula ratio is shown in Table 1.

[0045] Table 1 Recipe ratio (w / w)

[0046]

[0047] Mycorrhizal fungi-dependent pioneer plants (including but not limited to alfalfa, clover, wheat straw, Amorpha fruticosa, vetiver, etc.) (host plants) can be planted on the first interlayer to construct a green bank. The stockpile thickness, pioneer crops, and maturation time can be referred to Table 2.

[0048] Table 2 Examples of stockpile thickness, pioneer crops and maturation time

[0049]

[0050] S8: Planting management: When the plant has two true leaves, all seedlings are emerging, the seedlings are in good condition, and the plants are growing vigorously, add about 3‰-5‰ of biological vinegar to the surface of the green storage, and water it every other day at 1-3L / m 2 , repeat once a week for 2-3 weeks. After applying bio-vinegar, add water-soluble nitrogen fertilizer every other week for a total of 4-6 weeks.

[0051] S9: Every 3-6 months, harvest some or all of the surface plant parts and, as in step S1, use a pyrolysis furnace to pyrolyze them into biochar, biovinegar, and biotar, which are used to accelerate soil quality improvement and prevent pests and diseases in the green reservoir. After use, soil samples can be taken promptly to test for microorganisms, organic matter, pH, and conductivity, allowing adjustments to be made to the application rate of biovinegar and other ingredients to improve soil quality.

[0052] S10: After reaching the storage period, the green storage soil can be stored continuously and matured, or the soil can be screened, mixed, and tempered by adding corresponding microbial agents and nutrients according to market demand to produce green and low-carbon soil improvers, soil conditioners, soil purification materials, and organic fertilizers.

[0053] During the construction of the green bank in step S7, a root drip irrigation and oxygenation system is selected, along with a sampling corridor (for regular sampling to determine whether the soil meets nutrient requirements and whether the root system has reached propagation standards). A solar-assisted light source system is also provided to promote plant growth, soil maturation, and pest control. The root drip irrigation and oxygenation system can be based on existing technologies, such as those described in Chinese Patent Publication No. CN108476933A. Other root drip irrigation and oxygenation systems may also be used.

[0054] The green and low-carbon soil improvement materials produced by the present invention mainly use industrial solid wastes such as gangue, steel slag, fly ash, and slag, urban solid wastes such as kitchen waste and municipal sludge, and agricultural solid wastes such as straw and feces.

[0055] The production of green and low-carbon soil improvement materials in the present invention requires matching mycorrhizal fungi and host plants according to the natural phenological conditions of the production site and the main application goals (planted plants, planting environment and natural conditions).

[0056] The soil carbon sink formed in the production process of the present invention is calculated by referring to the biomass method through plant planting, harvesting, pyrolysis processing of biochar, biovinegar and waste heat utilization.

[0057] In the present invention, industrial solid wastes such as gangue, steel slag, fly ash, slag, urban solid wastes such as kitchen waste, municipal sludge, and agricultural solid wastes such as straw and feces are used as the main raw materials. The flue gas (acidic water-containing gas, including a small amount of bio-tar-BT and bio-vinegar-BV) generated by pyrolysis of briquetting materials such as kitchen waste, sludge, straw, and feces is used for air distribution and air separation classification after Raymond mill or medium-speed mill or air flow milling to produce fine powder. The waste heat of the flue gas is fully utilized, and the components are mixed, reacted, homogenized, and carried with gangue, steel slag, fly ash, slag, etc. during the grinding process to adjust the pH value and physical and chemical properties of the powder. After that, the powder is separated and classified by air to form powders (micropowders and ultrafine powders) with different physical properties and different particle sizes for use. Mycorrhizal fungi complex Bacterial agent can enhance host plant adaptability, stress resistance, disease resistance and penetrability, and accelerate the decomposition of nutrients and organic matter in soil, and improve soil maturation process; Carbon is fixed by photosynthesis during the growth and development of host plants, and its root system and root-circumference life community not only increase soil organic matter content; And produce rich beneficial microbial communities; Host plant aboveground objects process biochar and biovinegar, etc., on the one hand improve water and fertilizer conditions, on the other hand the quantitative use of biovinegar, biotar, carries out plant growth promotion and pest control; By deep root host plants, mycorrhizal fungi, biochar and micropowder, ultrafine powder is combined, oxygen is strengthened to the deep layer of matrix (0.5-2.5 meters under matrix) conduction, accelerate green storage soil quality and improve. The present invention has good soil quality improvement effect, produces green and low-carbon soil improver, soil conditioner, soil purification material, organic fertilizer and other soil improvement materials; Soil improvement materials can be packaged and sold according to market demand, saves and occupies space, and comprehensive benefits are remarkable.

[0058] Compared with the prior art, the present invention has the following advantages:

[0059] 1. Based on the core idea of ​​"energy quality matching cascade utilization", the present invention makes full use of the pyrolysis flue gas components and waste heat from multiple sources of solid waste such as industrial and agricultural production and residents' lives to prepare micropowders and ultrafine powders, and at the same time solidifies sulfur oxides, nitrogen oxides, carbon dioxide, etc. in the flue gas, reducing the cost of flue gas purification, reducing emissions and increasing efficiency, and achieving green and low-carbon development.

[0060] 2. The present invention does not build a finished product warehouse. The finished products are used for site greening and planting mycorrhizal fungus-dependent pioneer plants. While greening and beautifying the environment and achieving biological carbon fixation, the organic matter content of the finished products is increased, the propagation agent is activated, and the soil quality is improved. When selling out of the warehouse, the soil can be taken, screened, packaged and sold according to the year, with significant comprehensive benefits.

[0061] The embodiments described above are merely descriptions of preferred implementations of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by ordinary technicians in this field should fall within the scope of protection determined by the claims of the present invention.

Claims

1. An ecological preparation method of soil improvement materials, characterized in that: The following steps are included in sequence: S1: Urban solid waste and agricultural solid waste are turned by a turner or mixed by a mixer, briquette by a briquetting machine, and pyrolyzed in a pyrolysis furnace at 400-700℃ to produce biochar. The acid gas containing biovinegar and biotar generated during the pyrolysis process is recovered, and the heat and water vapor generated during the pyrolysis process are also recovered. S2: crushing the industrial solid waste using a jaw crusher or hammer crusher, removing iron using a deironing device, removing impurities using a vibrating screen or sliding screen with an aperture of 30-50 mm, and sieving using a 40-mesh vibrating screen to obtain particles with an aperture of 40 mesh or less as raw materials for standby use; the particles with an aperture of greater than 40 mesh obtained by sieving are fed into a pulverizer for pulverization and classification, and simultaneously introduced into the pyrolysis acidic flue gas and water vapor generated in S1 for modification and activation to prepare fine powder with a particle size of 10-75 μm and ultrafine powder with a particle size of less than 10 μm; S3: The biochar prepared in step S1, the particles of 40 mesh or less obtained in step S2, the fine powder and ultrafine powder prepared in step S2 are graded as needed, cyclically crushed and screened, and homogenized. The products are spread to form a base. The biochar content in the base can be 0. The base thickness is calculated using the formula H = h × k, where: H - base thickness, in m, h - the maximum average root length of various host plants planted, in meters, k-penetration coefficient, the value of k is 1.2-1.5; S4: Spread base fertilizer Ca(H2PO4)2 or KH2PO4 5-10g / m on the base of step S3 2 , urea 10-20g / m 2 , forming a base fertilizer layer; S5: Laying a second interlayer with a thickness of 5-10 cm on the base fertilizer layer of step S4, wherein the composition of the second interlayer is the same as that of the base, and the content of the biochar, micropowder, and ultrafine powder in the second interlayer is higher than that of the biochar, micropowder, and ultrafine powder in the base; S6: Spreading a mycorrhizal fungus composite agent on the upper portion of the second barrier layer in step S5; S7: laying a 5-10 cm thick interlayer 1 on top of the mycorrhizal fungus composite inoculant of step S6, wherein the composition of the interlayer 1 is the same as that of the substrate, and the content of biochar, micropowder, and ultrafine powder in the interlayer 1 is higher than that of the biochar, micropowder, and ultrafine powder in the substrate, and then planting or transplanting mycorrhizal fungus-dependent pioneer plants on the interlayer 1 to build a green bank; S8: Planting management: When the plant has two true leaves, all seedlings are emerging, the seedlings are in good condition, and the growth is vigorous, add 3‰-5‰ of bio-vinegar to the surface of the green storage, and water it every other day at a concentration of 1-3L / m 2 Repeat once a week for 2-3 weeks; add water-soluble nitrogen fertilizer every other week after applying bio-vinegar for a total of 4-6 weeks; S9: Harvest part or all of the above-ground parts of the plant every 3-6 months and process them into biochar, biovinegar and biotar using a pyrolysis furnace; S10: Continue to store the green storage soil and continue to mature it; or take soil, screen it, mix it evenly, add corresponding microbial agents and nutrients to condition it according to market demand, and produce green and low-carbon soil improvers, soil conditioners, soil purification materials, and organic fertilizers.

2. The method for preparing the soil improvement material according to claim 1, wherein: In step S2, the pulverizing / classifying equipment is selected from any one of air flow mill, steam mill, ball mill or Raymond mill. The equipment is required to be corrosion-resistant and equipped with a wet electrostatic precipitator or an acid-resistant and moisture-resistant bag dust collector to collect the S2 product.

3. The method for preparing the soil improvement material according to claim 1, wherein: In step S2, the pulverizing / classifying equipment is selected from any one of a medium-speed mill, a Raymond mill, and a ball mill, and the particles produced are flat flakes; the pulverizing / classifying equipment is selected from one of a jet mill and a steam mill, and the particles produced are polyhedrons.

4. The method for preparing the soil improvement material according to claim 2 or 3, wherein: In step S2, the acid gas and the water vapor are both products of the pyrolysis process in step S1.

5. The method for preparing the soil improvement material according to claim 4, wherein: In step S6, the mycorrhizal fungus composite agent is composed of mycorrhizal fungi, rhizosphere growth-promoting bacteria, pythium, a water-retaining agent and a carbon-based supporting adsorption material.

6. The method for preparing the soil improvement material according to claim 5, wherein: In step S6, per square meter of interlayer 2, the mycorrhizal fungus composite agent and one of nutrient soil, peat soil or weathered coal are evenly mixed at a mass ratio of 1:1000, and after thorough dispersion, are evenly spread on interlayer 2, wherein the amount of the mycorrhizal fungus composite agent is 0.1-5g, and the amount of one of nutrient soil, peat soil or weathered coal is 0.1-5kg.

7. The method for preparing a soil improvement material according to claim 6, wherein: In step S7, when planting or transplanting plants, the mycorrhizal fungus composite agent is used to treat the seeds or plant branches. The seeds need to be coated and mixed, and the branches need to be dipped in roots.

8. The method for preparing the soil improvement material according to claim 7, wherein: During the construction of the green storage in step S7, a root drip irrigation and oxygenation system is selected, and a sampling corridor is built and equipped with a solar auxiliary light source system to promote plant development, soil maturation and prevention of pests and diseases.

9. A soil improvement material prepared by the method for preparing a soil improvement material according to any one of claims 1 to 8.

10. Use of the soil improving material according to claim 9.

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