A desert sand ecological restoration and improvement agent and its application method

Abstract

This invention discloses a desert sand ecological restoration improver. By weight, the raw materials include 50-55 parts mineral materials; 8-12 parts fiber materials; 25-30 parts cementing materials; and 2-3 parts microbial agents. This invention utilizes mineral materials to improve soil texture, fiber materials to enhance structural stability, cementing materials to improve water and fertilizer retention, and microbial agents to promote nutrient conversion. Nano-modified bentonite enables slow nutrient release, and specific humic acid enhances the improvement effect. Reasonable application steps ensure uniform action of the improver, and biodegradable fiber rods continuously provide water and fertilizer. The synergistic effect of multiple technologies effectively improves the barren condition of desert sand, enhances soil fertility and water and fertilizer retention capacity, creates a favorable environment for plant growth, and contributes to desert ecological restoration.

Description

Technical Field

[0001] This invention relates to the field of desert sand ecological restoration. More specifically, this invention relates to a desert sand ecological restoration modifier and its application method. Background Technology

[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 revolve around three major categories of methods: mechanical, chemical, and biological sand fixation. However, these technologies have significant limitations in practical applications.

[0003] Problems with mechanical sand fixation: Materials like straw checkerboards are susceptible to wind and sand erosion, requiring frequent maintenance and replacement every 3-5 years; large-scale construction is costly and difficult to maintain long-term in extremely arid areas; hard materials (such as stones) may hinder natural plant growth and disrupt the sandy micro-ecosystem. Problems with chemical sand fixation: This involves using polymeric water-retaining agents (such as polyacrylamide), asphalt, or cement to bind sand particles. These problems include: degradation products of synthetic materials may pollute soil and water sources, for example, asphalt releases toxic substances; some chemical materials reduce sand permeability, exacerbating water evaporation and hindering plant growth; polymeric water-retaining agents cost as much as $5000 per ton, making large-scale promotion difficult.

[0004] Problems with biological sand fixation: This involves planting drought-resistant plants or using microbial crusts to fix sand dunes. The problems include: slow results: plants have long growth cycles, requiring several years to form stable vegetation, and survival rates are limited by climate; water resource dependence: in extremely arid areas, artificial irrigation is necessary, increasing water pressure; ecological monoculture: planting a single plant species may lead to a decline in biodiversity and a fragile ecosystem.

[0005] Most technologies only achieve surface sand fixation, failing to create a granular structure and nutrient cycling system similar to natural soil. They also lack sustainability: technologies relying on external materials (such as binders and chemicals) are difficult to maintain in the long term and may cause secondary pollution. Furthermore, they have poor regional adaptability: desert types are diverse (such as shifting dunes and semi-fixed sand dunes), and existing technologies lack universally applicable solutions. Finally, they neglect ecological balance: some technologies excessively pursue "turning desert into arable land," ignoring the value of deserts as independent ecosystems and potentially damaging biodiversity.

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

[0007] To achieve these objectives and other advantages according to the present invention, a preferred embodiment of the present invention provides a desert sand ecological restoration and amendment agent, comprising, by weight, the following raw materials:

[0008] 50-55 parts of mineral materials;

[0009] 8-12 parts of fiber material;

[0010] 25-30 parts of cementitious material;

[0011] 2-3 parts of microbial inoculant.

[0012] Mineral materials fill the gaps between desert sand particles, improving soil texture and making it more similar to soil structures suitable for plant growth. Fiber materials interweave between soil particles, enhancing soil structural stability and reducing wind erosion. Cementitious materials act as binders, binding soil particles together to form aggregates and improving the soil's water and fertilizer retention capacity. Microorganisms in microbial agents grow and reproduce in the soil, promoting the decomposition of organic matter and nutrient transformation. Ultimately, the improved desert sand provides a favorable physical, chemical, and biological environment for plant growth, improving plant survival rates and growth quality.

[0013] 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 stalks, reeds, bulrushes, or grapevines; and the cementing material is selected from one or more of beet molasses, tomato residue, cottonseed meal fermentation liquid, or jujube waste liquid.

[0014] Mineral materials such as coal gangue can replenish the soil with various minerals and trace elements, improving its chemical properties. Fiber materials such as cotton stalks and reeds form a network structure in the soil, enhancing its aeration and structural stability. Cementitious materials such as beet molasses and tomato waste bind soil particles together, forming stable aggregates and improving the soil's water and fertilizer retention capacity. These materials work together to significantly improve the physical and chemical properties of desert sand, making it more suitable for plant root growth and nutrient absorption, thus providing more favorable conditions for plant growth in the desert environment.

[0015] Preferably, the microbial inoculant comprises nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0016] Nitrogen-fixing bacteria utilize their nitrogenase system to convert atmospheric nitrogen into ammonia, which is then converted into ammonium or nitrate nitrogen that plants can absorb, increasing the nitrogen content in the soil. Phosphate-solubilizing bacteria secrete organic acids and other substances to dissolve insoluble phosphorus compounds such as phosphate rock and calcium phosphate in the soil, releasing available phosphorus and improving soil phosphorus availability. Mycorrhizal fungi establish a symbiotic relationship with plant roots, and their mycelia can extend further into the soil, helping plants absorb more water and nutrients. They also secrete substances that enhance plant resistance. The synergistic effect of these three microorganisms significantly improves the fertility of desert sandy soils, improves the soil's microbial ecological environment, provides sufficient nutrient supply for plant growth in the desert environment, and promotes healthy plant growth.

[0017] Preferably, the mineral material comprises nanoscale modified bentonite, which undergoes in-situ intercalation polymerization to embed a polyacrylamide / humic acid composite gel between the layers, forming a slow-release structure with pH-responsive ion exchange capacity. The nanoscale modified bentonite accounts for 1 / 10 of the mass of the mineral material.

[0018] When a soil conditioner containing nano-modified bentonite is applied to desert sand, the pH-responsive slow-release structure of the nano-modified bentonite plays a crucial role. When the soil is alkaline, the gel swells, slowly releasing stored nutrients into the soil to provide a continuous nutrient supply for plants. Simultaneously, this structure enhances the soil's ion adsorption and exchange capacity, improves its water and fertilizer retention properties, and increases its buffering capacity against pH changes. This makes the desert sand soil environment more stable, which is beneficial for plant root growth and development, and enhances the plant's adaptability and resilience in the desert environment.

[0019] Preferably, the nano-sized modified bentonite is prepared by the following method:

[0020] a) Natural calcium-based bentonite was modified by sodium treatment and then processed by high pressure homogenization to obtain a 3wt% nano-bentonite suspension with a particle size ≤100nm.

[0021] b) Acrylamide monomer and humic acid were mixed at a mass ratio of 3:1, and 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite were added. The mixture was prepolymerized at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel.

[0022] c) Mix the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, add 0.8% by weight of N,N'-methylenebisacrylamide crosslinking agent of acrylamide monomer, and polymerize for 2 hours under the assistance of 40kHz ultrasound.

[0023] d) After the reaction is complete, continue to add pH adjuster to adjust the pH to 9.0 so that the polyacrylamide / humic acid composite gel swells in the bentonite layer for 1 hour, and then lowers the pH to 4.5 and holds for 10 minutes to shrink and fix the gel, finally obtaining the target product, nanoscale modified bentonite.

[0024] Sodium modification and high-pressure homogenization give bentonite good dispersibility and high activity, enabling it to interact better with other materials. Specific polymerization conditions and pH adjustment processes successfully embed polyacrylamide / humic acid composite gel into the bentonite layers, forming a stable and pH-responsive slow-release structure. When a modifier containing this nano-modified bentonite is applied to alkaline desert sand, the nano-modified bentonite effectively improves the water and fertilizer retention capacity of the desert sand, precisely controls nutrient release according to changes in soil pH, improves nutrient utilization efficiency, and enhances soil structural stability, creating a more favorable soil environment for plant growth and improving the effectiveness and quality of desert sand ecological restoration.

[0025] Preferably, the humic acid is a weathered coal extract with a carboxyl content ≥4.5 mmol / g and a molecular weight controlled between 2000-5000 Da.

[0026] Humic acid extracted from weathered coal with specific carboxyl content and molecular weight ranges played a crucial role in the preparation of polyacrylamide / humic acid composite gels and nanoscale modified bentonite. The high carboxyl content endowed humic acid with strong ion exchange capacity and adsorption properties, enabling better polymerization with acrylamide to form a composite gel with excellent performance. The suitable molecular weight ensured the gel's embedding and swelling-shrinkage characteristics within the bentonite layers, enhancing the pH responsiveness and slow-release effect of the nanoscale modified bentonite. When the modifier prepared with this humic acid was applied to desert sand, it more effectively improved the sand's water retention, fertilizer retention, and nutrient regulation capabilities, providing a stable and continuous nutrient supply for plant growth, improving plant growth quality, and increasing the efficiency of desert sand ecological restoration.

[0027] On the other hand, one embodiment of the present invention also provides a method for using the aforementioned desert sand ecological restoration material, comprising the following steps:

[0028] S1. Mix mineral materials, fiber materials, cementing materials, and microbial agents in a uniform proportion to form a modifier;

[0029] S2. Add water to the improver at a mass ratio of 1:1 and stir until well mixed;

[0030] S3. Spread the modifier obtained in S2 evenly on the surface of desert sand, and control the dosage to be 75±25 kg / m³.

[0031] S4. Rotary tillage is carried out on the desert where the amendment has been applied, with a tillage depth of 30 cm.

[0032] S5. Allow to naturally mature until a crust forms.

[0033] Uniform mixing ensures the synergistic effect of each component in the amendment; proportional water addition provides the amendment with suitable moisture, facilitating application and mixing with desert sand; precise control of application rate and rotary tillage depth guarantees thorough and uniform mixing of the amendment with the desert sand, allowing the amendment to contact more sand particles and effectively improve the properties of the desert sand. The naturally formed crust layer reduces soil moisture evaporation, prevents wind and sand erosion, and provides a stable environment for seed germination and seedling growth, thus improving the ecological restoration effect of desert sand and the survival rate of plants in the desert environment.

[0034] Preferably, biodegradable fiber rods are vertically inserted into the rotary-tilled sand layer. The rods contain slow-release fertilizer and sodium polyacrylate, and are distributed in a 20×20cm grid.

[0035] Biodegradable fiber rods are rod-shaped objects made of biodegradable materials that can decompose in the soil after a certain period of time; 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 capacity.

[0036] This invention offers at least the following beneficial effects: The desert sand ecological restoration improver and its application method of this invention have significant beneficial effects. The improver utilizes a scientifically proportioned blend of various materials, employing mineral materials to improve soil texture, fiber materials to enhance structural stability, cementing materials to improve water and fertilizer retention, and microbial agents to promote nutrient conversion. Nano-modified bentonite enables slow nutrient release, and specific humic acids enhance the improvement effect. Reasonable application steps ensure the improver acts evenly, and biodegradable fiber rods continuously provide water and fertilizer. The synergistic effect of multiple technologies effectively improves the barren condition of desert sand, enhances soil fertility and water and fertilizer retention capacity, creates a favorable environment for plant growth, and contributes to desert ecological restoration.

[0037] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Detailed Implementation

[0038] The present invention will be further described in detail below with reference to embodiments, so that those skilled in the art can implement it based on the description.

[0039] The following description is intended to disclose the present invention and enable those skilled in the art to implement it. The preferred embodiments described below are merely examples, and other obvious modifications will occur to those skilled in the art. The basic principles of the invention defined in the following description can be applied to other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the invention.

[0040] It is understood that the term "a" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0041] Example 1

[0042] This embodiment provides a desert sand ecological restoration and amendment agent, comprising: 55 parts mineral materials, 10 parts fiber materials, 30 parts cementing materials, and 3 parts microbial inoculants. The microbial inoculants include nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0043] The mineral material includes nano-modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The preparation process of the nano-modified bentonite is as follows:

[0044] a) Natural calcium-based bentonite was modified by sodium treatment and then processed by high pressure homogenization to obtain a 3wt% nano-bentonite suspension with a particle size ≤100nm.

[0045] b) Acrylamide monomer and humic acid were mixed at a mass ratio of 3:1, and 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite were added. The mixture was prepolymerized at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel.

[0046] c) Mix the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, add 0.8% by weight of N,N'-methylenebisacrylamide crosslinking agent of acrylamide monomer, and polymerize for 2 hours under the assistance of 40kHz ultrasound.

[0047] d) After the reaction is complete, continue to add pH adjuster to adjust the pH to 9.0 so that the polyacrylamide / humic acid composite gel swells in the bentonite layer for 1 hour, and then lowers the pH to 4.5 and holds for 10 minutes to shrink and fix the gel, finally obtaining the target product, nanoscale modified bentonite.

[0048] The humic acid is a weathered coal extract with a carboxyl content ≥4.5mmol / g and a molecular weight controlled between 2000-5000Da.

[0049] Example 2

[0050] This embodiment provides a desert sand ecological restoration and amendment agent, comprising: 50 parts mineral materials, 12 parts fiber materials, 30 parts cementing materials, and 2 parts microbial inoculants. The microbial inoculants include nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0051] The mineral material includes nano-modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The preparation process of the nano-modified bentonite is as follows:

[0052] a) Natural calcium-based bentonite was modified by sodium treatment and then processed by high pressure homogenization to obtain a 3wt% nano-bentonite suspension with a particle size ≤100nm.

[0053] b) Acrylamide monomer and humic acid were mixed at a mass ratio of 3:1, and 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite were added. The mixture was prepolymerized at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel.

[0054] c) Mix the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, add 0.8% by weight of N,N'-methylenebisacrylamide crosslinking agent of acrylamide monomer, and polymerize for 2 hours under the assistance of 40kHz ultrasound.

[0055] d) After the reaction is complete, continue to add pH adjuster to adjust the pH to 9.0 so that the polyacrylamide / humic acid composite gel swells in the bentonite layer for 1 hour, and then lowers the pH to 4.5 and holds for 10 minutes to shrink and fix the gel, finally obtaining the target product, nanoscale modified bentonite.

[0056] The humic acid is a weathered coal extract with a carboxyl content ≥4.5mmol / g and a molecular weight controlled between 2000-5000Da.

[0057] Example 3

[0058] This embodiment provides a desert sand ecological restoration and amendment agent, comprising: 53 parts mineral materials, 8 parts fiber materials, 30 parts cementing materials, and 2 parts microbial inoculants. The microbial inoculants include nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and mycorrhizal fungi in a mass ratio of 1:1:1.

[0059] The mineral material includes nano-modified bentonite, which accounts for 1 / 10 of the mass of the mineral material. The preparation process of the nano-modified bentonite is as follows:

[0060] a) Natural calcium-based bentonite was modified by sodium treatment and then processed by high pressure homogenization to obtain a 3wt% nano-bentonite suspension with a particle size ≤100nm.

[0061] b) Acrylamide monomer and humic acid were mixed at a mass ratio of 3:1, and 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite were added. The mixture was prepolymerized at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel.

[0062] c) Mix the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, add 0.8% by weight of N,N'-methylenebisacrylamide crosslinking agent of acrylamide monomer, and polymerize for 2 hours under the assistance of 40kHz ultrasound.

[0063] d) After the reaction is complete, continue to add pH adjuster to adjust the pH to 9.0 so that the polyacrylamide / humic acid composite gel swells in the bentonite layer for 1 hour, and then lowers the pH to 4.5 and holds for 10 minutes to shrink and fix the gel, finally obtaining the target product, nanoscale modified bentonite.

[0064] The humic acid is a weathered coal extract with a carboxyl content ≥4.5mmol / g and a molecular weight controlled between 2000-5000Da.

[0065] Comparative Example 1

[0066] The comparative agent 1 and the improver of Example 1 have the same raw material ratio, the only difference being that comparative agent 1 does not contain nano-modified bentonite.

[0067] Comparative Example 2

[0068] 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 nano-modified bentonite in Comparative Example 2, there is no step d, that is, no pH adjustment step of adding pH adjuster.

[0069] Comparative Example 3

[0070] The comparative agent 1 and the improver of Example 1 have the same raw material ratio. The only difference is that the molecular weight of humic acid in Comparative Example 3 is controlled at 10,000-15,000 Da.

[0071] The improvers prepared in the above embodiments and comparative examples were tested for water retention rate and fertilizer retention rate. The test methods are as follows, and the test results are shown in Table 1.

[0072] Table 1 shows the water retention rate and fertilizer retention rate of the improvers in each example and comparative example.

[0073]

[0074] As shown in Table 1, the water retention and fertilizer retention rates of Examples 1-3 using the improver formulated in this invention are significantly better than those of Comparative Examples 1-3. The significant decrease in water retention and fertilizer retention rates in Comparative Example 1 indicates that nano-bentonite is key to the improver's performance. This is likely due to the large specific surface area and interlayer structure of nano-bentonite, which locks in moisture through surface adsorption and capillary action, resulting in excellent water retention. Furthermore, the polyacrylamide / humic acid composite gel embedded in the bentonite layers swells in an alkaline environment (pH 9.0), releasing water and nutrients; it shrinks in an acidic environment (pH 4.5), reducing leaching (as shown in Table 2, the water retention rate 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. The gel was not fixed within the bentonite layers by pH adjustment, making dynamic release impossible and resulting in excessively rapid nutrient and water release. In Comparative Example 3, the humic acid with an excessively large molecular weight (10000-15000 Da) was unable to effectively embed itself within the bentonite layers, leading to a loose gel structure and reduced slow-release performance (water retention 60%, fertilizer retention 64%). In contrast, the humic acid molecular weight (2000-5000 Da) and carboxyl content (≥4.5 mmol / g) in the examples optimized the gel's stability and ion exchange capacity.

[0075] Table 2 shows the water retention test results of the mixture of the modifiers of each embodiment with pH 9.0 sand and pH 5.5 sand.

[0076]

[0077] As shown in Table 2, the water retention and fertilizer retention rates of the modifiers used in Examples 1-3 of this invention, applied to alkaline sandy soil with a pH of 9.0, were significantly better than those of sandy soil with a pH of 5.5. This is attributed to the pH-responsive slow-release mechanism and synergistic effect of the nano-modified bentonite. Specifically, the polyacrylamide / humic acid composite gel embedded in the nano-bentonite layers swells under alkaline conditions, and the carboxyl groups (-COOH) ionize. Electrostatic repulsion causes the gel network to expand (swelling degree increases significantly at pH>7), releasing stored water and nutrients (such as...). Bentonite's cation exchange capacity increases in an alkaline environment, through... Plasma displaces more nutrients (such as This improves the fertilizer retention rate (89-90% at pH 9.0 in Table 2), and pH 9.0 is more suitable for the metabolism of nitrogen-fixing bacteria, phosphate-solubilizing bacteria, and other microorganisms (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 (such as phosphate-solubilizing bacteria dissolving calcium phosphate). Since desert sand is generally alkaline, the amendment proposed in this application can be well applied to the remediation and improvement of desert sand.

[0078] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for the present invention. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their 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 weight, 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 inoculant; 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 stalks, reeds, bulrushes, or grapevines; the cementing material is selected from one or more of beet molasses, tomato residue, cottonseed meal fermentation liquid, or jujube waste liquid. The mineral material includes nano-modified bentonite, which accounts for 1 / 10 of the mineral material mass. It undergoes in-situ intercalation polymerization to embed polyacrylamide / humic acid composite gel between the layers, forming a slow-release structure with pH-responsive ion exchange capacity. The humic acid is a weathered coal extract with a carboxyl content ≥4.5mmol / g and a molecular weight controlled between 2000-5000Da. Nanoscale modified bentonite was prepared by the following method: a) Natural calcium-based bentonite was modified by sodium treatment and then processed by high pressure homogenization to obtain a 3wt% nano-bentonite suspension with a particle size ≤100nm. b) Acrylamide monomer and humic acid were mixed at a mass ratio of 3:1, and 0.1 wt% ammonium persulfate and 0.05 wt% sodium bisulfite were added. The mixture was prepolymerized at 60°C for 30 minutes under nitrogen protection to form a polyacrylamide / humic acid composite gel. c) Mix the nano-bentonite suspension with the polyacrylamide / humic acid composite gel at a solid-liquid ratio of 1:5, add 0.8% by weight of N,N'-methylenebisacrylamide crosslinking agent of acrylamide monomer, and polymerize for 2 hours under the assistance of 40kHz ultrasound. d) After the reaction is complete, continue to add pH adjuster to adjust the pH to 9.0 so that the polyacrylamide / humic acid composite gel swells in the bentonite layer for 1 hour, and then lowers the pH to 4.5 and holds for 10 minutes to shrink and fix the gel, finally obtaining the target product, nanoscale modified bentonite.

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

1.

3. The method of using the desert sand ecological restoration and amendment agent according to any one of claims 1-2, characterized in that, Includes the following steps: S1. Mix mineral materials, fiber materials, cementing materials, and microbial agents in a uniform proportion to form a modifier; S2. Add water to the improver at a mass ratio of 1:1 and stir until well mixed; S3. Spread the modifier obtained in S2 evenly on the surface of desert sand, and control the dosage to be 75±25 kg / m³. S4. Rotary tillage is carried out on the desert where the amendment has been applied, with a tillage depth of 30 cm. S5. Allow to naturally mature until a crust forms.

4. The method of using the desert sand ecological restoration and amendment agent according to claim 3, characterized in that, Biodegradable fiber rods containing slow-release fertilizer and sodium polyacrylate are vertically inserted into the rotary-tilled sand layer, with a grid distribution of 20×20cm spacing.

Images