Desert sand ecological restoration modifier and use method thereof

Abstract

The invention discloses a desert sand ecological restoration modifier which comprises the following raw materials in parts by mass: 50-55 parts of a mineral material; 8-12 parts of a fiber material; 25 to 30 parts of a cementing material; according to the invention, the mineral material is used for improving the soil texture, the fiber material is used for enhancing the structural stability, the cementing material is used for improving the water and fertilizer retention, and the microbial agent is used for promoting nutrient conversion. The nano-scale modified bentonite realizes nutrient slow release, and the specific humic acid enhances the improvement effect. The reasonable use steps ensure the uniform effect of the modifier, and the degradable fiber rods continuously provide water and fertilizer. Through the synergistic effect of multiple technologies, the desert sand barren condition is effectively improved, the soil fertility and the water and fertilizer retention capacity are improved, a good environment is created for plant growth, and desert ecological restoration is assisted.

Description

Technical Field

[0001] The present invention relates to the field of desert sand ecological restoration, and more specifically, to a desert sand ecological restoration improver and a method of using the same. Background Art

[0002] Desert ecological restoration is of great significance for improving the ecological environment and expanding land use space. In the field of desert control, existing technologies mainly focus on three categories of sand fixation: mechanical, chemical, and biological methods. However, these technologies have significant limitations in practical application.

[0003] Problems with mechanical sand fixation: Materials like grass grids are susceptible to wind and sand erosion, requiring frequent maintenance and replacement every three to five years. Large-scale construction is costly and difficult to sustain long-term in extremely arid areas. Hard materials (such as rocks) can hinder natural plant growth and disrupt the sand's microecology. Problems with chemical sand fixation: Sand particles are bound together using polymer water-retaining agents (such as polyacrylamide), asphalt, or cement. Problems with synthetic material degradation: The degradation products of asphalt, for example, can contaminate soil and water sources. Some chemical materials can reduce sand permeability, increasing water evaporation and negatively impacting plant growth. Polymer water-retaining agents cost as much as $5,000 per ton, making them difficult to implement on a large scale.

[0004] Problems with biological sand fixation: Sand is stabilized by planting drought-tolerant plants or using microbial crusts. Problems include: slow effectiveness: plant growth cycles are long, requiring several years to establish a stable vegetation cover, and survival rates are limited by climate; water resource dependence: in extremely arid areas, artificial irrigation is necessary, increasing water pressure; ecological monoculture: monoculture can lead to a decline in biodiversity and fragile ecosystems.

[0005] Most technologies only achieve surface sand fixation, failing to develop a granular structure and nutrient recycling system similar to natural soil. Lack of sustainability: Technologies that rely on external materials (such as adhesives and chemicals) struggle to maintain their effectiveness over the long term and may cause secondary pollution. Poor regional adaptability: Desert types vary (such as mobile dunes and semi-fixed sand), and existing technologies lack universal solutions. Ignoring ecological balance: Some technologies excessively pursue the goal of "transforming deserts into fertile fields," ignoring the value of deserts as independent ecosystems and potentially damaging biodiversity.

[0006] Although existing technologies have made some progress, further breakthroughs are needed in cost, sustainability and ecological compatibility to achieve long-term effectiveness in desert control. Summary of the Invention

[0007] In order to achieve these purposes and other advantages according to the present invention, a preferred embodiment of the present invention provides a desert sand ecological restoration and improvement agent, which comprises, by weight, the following raw materials: 50-55 parts of mineral materials; 8-12 parts of fiber material; 25-30 parts of cementitious material; 2-3 parts of microbial agent.

[0008] Mineral materials fill the spaces between desert sand particles, improving the soil's texture and bringing it closer to a structure suitable for plant growth. Fiber materials weave between soil particles, enhancing their structural stability and reducing wind and sand erosion. Cementitious materials act as a binder, binding soil particles together to form aggregates, improving the soil's ability to retain water and nutrients. Microorganisms in microbial agents grow and multiply in the soil, promoting the decomposition of organic matter and the conversion of nutrients. Ultimately, the improved desert sand provides a favorable physical, chemical, and biological environment for plant growth, improving the survival rate and growth quality of plants in the desert sand.

[0009] Preferably, the mineral material is selected from one or more of coal gangue, weathered coal or salt lake silt; the fiber material is selected from one or more of cotton straw, reed, Achnatherum splendens or grapevine; and the gelling material is selected from one or more of beet molasses, tomato waste residue, cottonseed meal fermentation liquid or red date waste liquid.

[0010] Mineral materials like coal gangue can replenish the soil with a variety of minerals and trace elements, improving its chemical properties. Fiber materials like cotton straw and reeds form a network within the soil, enhancing its aeration and structural stability. Cementitious materials like beet molasses and tomato waste bind soil particles together, forming stable aggregates and improving the soil's ability to retain water and fertilizer. These materials, working together, significantly improve the physical and chemical properties of desert sand, making it more suitable for plant root growth and nutrient absorption, and providing more favorable conditions for plant growth in the desert environment.

[0011] Preferably, the microbial agent comprises nitrogen-fixing bacteria, phosphate-solubilizing bacteria and mycorrhizal fungi in a mass ratio of 1:1:1.

[0012] Nitrogen-fixing bacteria utilize their nitrogenase system to convert nitrogen in the air into ammonia, and then into ammonium or nitrate nitrogen that can be absorbed by plants, increasing the nitrogen content in the soil. Phosphate-solubilizing bacteria secrete substances such as organic acids to dissolve insoluble phosphorus compounds such as phosphate rock and calcium phosphate in the soil, releasing available phosphorus and increasing the effectiveness of soil phosphorus. Mycorrhizal fungi establish a symbiotic relationship with plant roots, and their mycelium can extend further into the soil, helping plants absorb more water and nutrients. They also secrete substances that enhance plant resistance to stress. The synergistic effect of these three microorganisms significantly increases the fertility of desert sandy soils, improves the soil's microbial ecosystem, provides an ample supply of nutrients for plant growth in desert environments, and promotes healthy plant growth.

[0013] Preferably, the mineral material comprises nano-scale modified bentonite, which has been subjected to in-situ intercalation polymerization to embed polyacrylamide / humic acid composite gel between layers to form a sustained-release structure with pH-responsive ion exchange capacity. The nano-scale modified bentonite accounts for 1 / 10 of the mineral material mass.

[0014] When applied to desert sand, the pH-responsive slow-release structure of the nano-modified bentonite gel swells when the soil becomes alkaline, slowly releasing stored nutrients into the soil and providing a continuous supply of nutrients for plants. This structure also enhances the soil's ion adsorption and exchange capacity, improving its water and nutrient retention and buffering capacity against pH fluctuations. This stabilizes the desert sand soil environment, promotes the growth and development of plant roots, and improves plant adaptability and resilience in the desert environment.

[0015] Preferably, the nano-modified bentonite is prepared by the following method: a) natural calcium-based bentonite is modified by sodiumization and then treated by high-pressure homogenization to a particle size of ≤100 nm to obtain a 3 wt% nano-bentonite suspension; b) mixing acrylamide monomer and humic acid in a mass ratio of 3:1, adding 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite, and prepolymerizing at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel; c) mixing the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, adding 0.8% of the mass of the acrylamide monomer as N,N'-methylenebisacrylamide crosslinker, and performing polymerization reaction under 40 kHz ultrasonic assistance for 2 hours; d) After the reaction is completed, a pH regulator is added to adjust the pH to 9.0 to allow the polyacrylamide / humic acid composite gel to swell between the bentonite layers for 1 hour, and then the pH is lowered to 4.5 and maintained for 10 minutes to allow the gel to shrink and fix, ultimately obtaining the target product, nano-scale modified bentonite.

[0016] Sodium modification and high-pressure homogenization give bentonite excellent dispersibility and high activity, enabling better interaction with other materials. Specific polymerization reaction conditions and pH adjustment successfully embed the polyacrylamide / humic acid composite gel within the bentonite interlayers, forming a stable and pH-responsive slow-release structure. When applied to alkaline desert sand, the nano-modified bentonite effectively improves its water and fertilizer retention, precisely controlling nutrient release based on soil pH fluctuations and enhancing nutrient utilization efficiency. It also enhances soil structural stability, creating a more favorable soil environment for plant growth and improving the effectiveness and quality of desert sand ecological restoration.

[0017] Preferably, the humic acid is extracted from weathered coal, has a carboxyl content of ≥4.5 mmol / g, and a molecular weight controlled within the range of 2000-5000 Da.

[0018] Humic acid from weathered coal extract, selected with a specific carboxyl content and molecular weight range, plays a key role in the preparation of polyacrylamide / humic acid composite gels and nanoscale modified bentonite. The high carboxyl content imparts humic acid with enhanced ion exchange and adsorption properties, enabling better polymerization with acrylamide to form a composite gel with excellent performance. The appropriate molecular weight ensures the gel's embedding and swelling / shrinkage characteristics between bentonite layers, enhancing the pH responsiveness and sustained-release properties of the nanoscale modified bentonite. When applied to desert sand, the modifier containing this humic acid can more effectively improve the sand's water and fertilizer retention and nutrient regulation capabilities, providing a stable and continuous nutrient supply for plant growth, improving plant growth quality and the efficiency of desert sand ecological restoration.

[0019] On the other hand, one embodiment of the present invention further provides a method for using the desert sand ecological restoration material, comprising the following steps: S1. Evenly mix the mineral material, fiber material, gelling material and microbial agent in proportion to form an improver; S2. Add water to the improver at a mass ratio of 1:1 and stir evenly; S3. Spread the modifier obtained in S2 evenly on the surface of the desert sand, controlling the dosage to 75±25 kg / m³; S4, rotary tilling and mixing the desert where the amendment was spread, with the rotary tillage depth being 30 cm; S5. Naturally cure until a crust is formed.

[0020] Uniform mixing ensures the synergistic effects of all components in the amendment. Water is added proportionally to ensure the amendment has the appropriate moisture content for easy spreading and mixing with the desert sand. Precise control of spreading dosage and rotary tillage depth ensures full and even mixing of the amendment and the desert sand, allowing the amendment to come into contact with more desert sand particles and effectively improving the properties of the desert sand. The crust layer formed by natural curing reduces soil moisture evaporation, prevents soil erosion by wind and sand, and provides a stable environment for plant seed germination and seedling growth, thereby improving the effectiveness of desert sand ecological restoration and the survival rate of plants in the desert environment.

[0021] Preferably, degradable fiber rods are vertically inserted into the sand layer after rotary tillage, and the rods contain slow-release fertilizer and sodium polyacrylate, with a spacing of 20×20 cm in a grid distribution.

[0022] Degradable fiber rods are made of degradable materials and are rod-shaped objects that can decompose after a certain period of time in the soil; slow-release fertilizers are fertilizers that can slowly release nutrients in the soil and continuously provide nutrition to plants; sodium polyacrylate is a high molecular polymer with super water absorption and retention capabilities.

[0023] The present invention includes at least the following beneficial effects: the desert sand ecological restoration modifier and the use method of the present invention have significant beneficial effects. The modifier scientifically proportions a variety of materials, uses mineral materials to improve soil texture, fiber materials to enhance structural stability, cementitious materials to improve water and fertilizer retention, and microbial agents to promote nutrient conversion. Nano-modified bentonite achieves slow release of nutrients, and specific humic acid enhances the improvement effect. Reasonable use steps ensure that the modifier acts evenly, and the degradable fiber rods continuously provide water and fertilizer. The synergistic effect of multiple technologies effectively improves the barren condition of desert sand, improves soil fertility and water and fertilizer retention capacity, creates a good environment for plant growth, and helps desert ecological restoration.

[0024] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. DETAILED DESCRIPTION

[0025] The present invention is further described in detail below with reference to the embodiments so that those skilled in the art can implement the invention with reference to the description.

[0026] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0027] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the elements may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0028] Example 1 This embodiment provides a desert sand ecological restoration and improvement agent, comprising: 55 parts of a mineral material, 10 parts of a fiber material, 30 parts of a cementitious material, and 3 parts of a microbial agent. The microbial agent comprises nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0029] The mineral material includes nano-scale modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The preparation process of the nano-scale modified bentonite is as follows: a) natural calcium-based bentonite is modified by sodiumization and then treated by high-pressure homogenization to a particle size of ≤100 nm to obtain a 3 wt% nano-bentonite suspension; b) mixing acrylamide monomer and humic acid in a mass ratio of 3:1, adding 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite, and prepolymerizing at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel; c) mixing the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, adding 0.8% of the mass of the acrylamide monomer as N,N'-methylenebisacrylamide crosslinker, and performing polymerization reaction under 40 kHz ultrasonic assistance for 2 hours; d) After the reaction is completed, a pH regulator is added to adjust the pH to 9.0 to allow the polyacrylamide / humic acid composite gel to swell between the bentonite layers for 1 hour, and then the pH is lowered to 4.5 and maintained for 10 minutes to allow the gel to shrink and fix, ultimately obtaining the target product, nano-scale modified bentonite.

[0030] The humic acid is extracted from weathered coal, has a carboxyl content of ≥4.5 mmol / g, and a molecular weight controlled within the range of 2000-5000 Da.

[0031] Example 2 This embodiment provides a desert sand ecological restoration agent, comprising: 50 parts of a mineral material, 12 parts of a fiber material, 30 parts of a cementitious material, and 2 parts of a microbial agent. The microbial agent comprises nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0032] The mineral material includes nano-scale modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The preparation process of the nano-scale modified bentonite is as follows: a) natural calcium-based bentonite is modified by sodiumization and then treated by high-pressure homogenization to a particle size of ≤100 nm to obtain a 3 wt% nano-bentonite suspension; b) mixing acrylamide monomer and humic acid in a mass ratio of 3:1, adding 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite, and prepolymerizing at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel; c) mixing the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, adding 0.8% of the mass of the acrylamide monomer as N,N'-methylenebisacrylamide crosslinker, and performing polymerization reaction under 40 kHz ultrasonic assistance for 2 hours; d) After the reaction is completed, a pH regulator is added to adjust the pH to 9.0 to allow the polyacrylamide / humic acid composite gel to swell between the bentonite layers for 1 hour, and then the pH is lowered to 4.5 and maintained for 10 minutes to allow the gel to shrink and fix, ultimately obtaining the target product, nano-scale modified bentonite.

[0033] The humic acid is extracted from weathered coal, has a carboxyl content of ≥4.5 mmol / g, and a molecular weight controlled within the range of 2000-5000 Da.

[0034] Example 3 This embodiment provides a desert sand ecological restoration agent, comprising: 53 parts of a mineral material, 8 parts of a fiber material, 30 parts of a cementitious material, and 2 parts of a microbial agent. The microbial agent comprises nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0035] The mineral material includes nano-scale modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The preparation process of the nano-scale modified bentonite is as follows: a) natural calcium-based bentonite is modified by sodiumization and then treated by high-pressure homogenization to a particle size of ≤100 nm to obtain a 3 wt% nano-bentonite suspension; b) mixing acrylamide monomer and humic acid in a mass ratio of 3:1, adding 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite, and prepolymerizing at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel; c) mixing the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, adding 0.8% of the mass of the acrylamide monomer as N,N'-methylenebisacrylamide crosslinker, and performing polymerization reaction under 40 kHz ultrasonic assistance for 2 hours; d) After the reaction is completed, a pH regulator is added to adjust the pH to 9.0 to allow the polyacrylamide / humic acid composite gel to swell between the bentonite layers for 1 hour, and then the pH is lowered to 4.5 and maintained for 10 minutes to allow the gel to shrink and fix, ultimately obtaining the target product, nano-scale modified bentonite.

[0036] The humic acid is extracted from weathered coal, has a carboxyl content of ≥4.5 mmol / g, and a molecular weight controlled within the range of 2000-5000 Da.

[0037] Comparative Example 1 The comparative agent 1 and the improver of Example 1 have the same raw material ratio, the only difference being that the comparative agent 1 does not contain nano-scale modified bentonite.

[0038] Comparative Example 2 The comparative agent 1 and the improver of Example 1 have the same raw material ratio. The only difference is that in the preparation process of the nano-modified bentonite in Comparative Example 2, there is no step d, that is, no step of adding a pH regulator to adjust the pH.

[0039] Comparative Example 3 The comparative agent 1 and the improver of Example 1 have the same raw material ratio, the only difference being that the molecular weight of humic acid in Comparative Example 3 is controlled within the range of 10,000-15,000 Da.

[0040] The improvers prepared in the above examples and comparative examples were tested for water retention rate and fertilizer retention rate respectively. The test methods are as follows. The test results are shown in Table 1.

[0041] Table 1 shows the test results of water retention rate and fertilizer retention rate of the improver in each embodiment and comparative example. As shown in Table 1, the water and fertilizer retention rates of Examples 1-3, using the improver formulation of the present invention, are significantly superior to those of Comparative Examples 1-3. The significant decrease in water and fertilizer retention rates in Comparative Example 1 demonstrates that nano-bentonite is key to the improver's performance. This is likely due to the nano-bentonite's large specific surface area and interlayer structure, which locks in water through surface adsorption and capillary action, resulting in excellent water retention. Furthermore, the polyacrylamide / humic acid composite gel embedded between the bentonite layers swells in an alkaline environment (pH 9.0), releasing water and nutrients; it contracts in an acidic environment (pH 4.5), reducing loss (as shown in Table 2, water retention is higher at pH 9.0). The cation exchange capacity (CEC) of bentonite can adsorb nutrient ions such as potassium and ammonium, reducing leaching losses. The water retention rate (56%) and fertilizer retention rate (58%) of Comparative Example 2 are lower than those of Examples 1-3 due to the lack of a pH-responsive structure. Without pH adjustment to anchor the gel between the bentonite layers, the release of nutrients and water could not be dynamically controlled, resulting in overly rapid nutrient and water release. In Comparative Example 3, the humic acid, with its excessively large molecular weight (10,000-15,000 Da), was unable to effectively embed itself between the bentonite layers, resulting in a loose gel structure and reduced sustained-release performance (water retention rate 60%, fertilizer retention rate 64%). In contrast, the humic acid molecular weight (2,000-5,000 Da) and carboxyl content (≥4.5 mmol / g) in the examples optimized the gel's stability and ion exchange capacity.

[0042] Table 2 shows the water retention test results of the modifiers of various examples mixed with pH 9.0 sand and pH 5.5 sand.

[0043] As can be seen from the data in Table 2, the water retention and fertilizer retention rates of Examples 1-3 using the modifier of the present invention applied to alkaline sandy soil with a pH of 9.0 are significantly better than those of sandy soil with a pH of 5.5. This is due to the pH-responsive slow-release mechanism of the nano-modified bentonite and the synergistic effect of multiple components. The polyacrylamide / humic acid composite gel embedded in the nano-bentonite layers swells under alkaline conditions, and the carboxyl groups (-COOH) are ionized. Electrostatic repulsion causes the gel network to expand (the swelling degree increases significantly when pH>7), releasing stored water and nutrients (such as ). The cation exchange capacity of bentonite increases in alkaline environment. Plasma displaces more nutrients (such as ), improving fertilizer retention (at pH 9.0 in Table 2, the fertilizer retention rate reaches 89-90%). Furthermore, pH 9.0 is more suitable for the metabolism of microorganisms such as nitrogen-fixing bacteria and phosphate-solubilizing bacteria (optimal pH 7-9). The organic acids and enzymes (such as urease and phosphatase) secreted by these microorganisms promote the decomposition of humic acid-nutrient complexes, releasing effective nutrients (for example, phosphate-solubilizing bacteria dissolve calcium phosphate). Since desert sand is generally alkaline, the amendment developed in this application is well suited for desert sand restoration and improvement.

[0044] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A desert sand ecological restoration and improvement agent, characterized in that: By mass, the raw materials include: 50-55 parts of mineral materials; 8-12 parts of fiber material; 25-30 parts of cementitious material; 2-3 parts of microbial agent; The mineral material is selected from one or more of coal gangue, weathered coal or salt lake silt; the fiber material is selected from one or more of cotton straw, reed, Achnatherum splendens or grapevine; the gelling material is selected from one or more of beet molasses, tomato waste residue, cottonseed meal fermentation liquid or red date waste liquid; The mineral material comprises nano-scale modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The nano-scale modified bentonite undergoes in-situ intercalation polymerization treatment, and a polyacrylamide / humic acid composite gel is embedded between the layers to form a sustained-release structure with pH-responsive ion exchange capacity. The humic acid is extracted from weathered coal, has a carboxyl content of ≥4.5 mmol / g, and a molecular weight controlled within the range of 2000-5000 Da.

2. The desert sand ecological restoration and improving agent according to claim 1, characterized in that The microbial agent comprises nitrogen-fixing bacteria, phosphate-solubilizing bacteria and mycorrhizal fungi in a mass ratio of 1:1:

1.

3. The desert sand ecological restoration and improving agent according to claim 1, characterized in that Nano-scale modified bentonite is prepared according to the following method: a) natural calcium-based bentonite is modified by sodiumization and then treated by high-pressure homogenization to a particle size of ≤100 nm to obtain a 3 wt% nano-bentonite suspension; b) mixing acrylamide monomer and humic acid in a mass ratio of 3:1, adding 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite, and prepolymerizing at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel; c) mixing the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, adding 0.8% of the mass of the acrylamide monomer as N,N'-methylenebisacrylamide crosslinker, and performing polymerization reaction under 40 kHz ultrasonic assistance for 2 hours; d) After the reaction is completed, a pH regulator is added to adjust the pH to 9.0 to allow the polyacrylamide / humic acid composite gel to swell between the bentonite layers for 1 hour, and then the pH is lowered to 4.5 and maintained for 10 minutes to allow the gel to shrink and fix, ultimately obtaining the target product, nano-scale modified bentonite.

4. The method for using the desert sand ecological restoration material according to any one of claims 1 to 3, characterized in that: The following steps are involved: S1. Evenly mix the mineral material, fiber material, gelling material and microbial agent in proportion to form an improver; S2. Add water to the improver at a mass ratio of 1:1 and stir evenly; S3. Spread the modifier obtained in S2 evenly on the surface of the desert sand, controlling the dosage to 75±25 kg / m³; S4, rotary tilling and mixing the desert where the amendment was spread, with the rotary tillage depth being 30 cm; S5. Naturally cure until a crust is formed.

5. The method for using the desert sand ecological restoration modifier according to claim 4, characterized in that: Degradable fiber rods containing slow-release fertilizer and sodium polyacrylate were vertically inserted into the sand layer after rotary tillage, with spacing in a 20×20 cm grid.

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