Ecological environment sand stabilization material and sand stabilization method

Abstract

The invention belongs to the technical field of desertification environment treatment, and particularly relates to an ecological environment sand stabilization material and a sand stabilization method. The invention provides a chemical-biological synergistic two-stage ecological sand fixation method. In the first stage, a stable consolidation layer is rapidly formed through a non-toxic and photodegradable first-stage sand fixation agent, and sand surface fixation is achieved; in the second stage, the second-stage sand solidification agent is used for slowly releasing nutrients and components thereof for degradation, elements needed by plant growth are continuously supplemented, decomposition of litters is accelerated in combination with plant clastic enzyme, and the content of organic matter in soil is remarkably increased. According to the sand stabilization material and the sand stabilization method, the limitation of single treatment is broken through, vegetation-soil forward succession is driven by a'fixing-supplementing 'closed-loop mechanism, the ecological function of desertified soil is remodeled from the source, and the sand stabilization material and the sand stabilization method have both environmental friendliness and long-acting stability.

Description

Technical Field

[0001] This invention belongs to the field of desertification control technology, specifically relating to an ecological sand-fixing material and a sand-fixing method. Background Technology

[0002] Land desertification is a global environmental problem that has severely impacted the Earth's ecological environment and socio-economic development. It is reported that desertified land globally has reached 40 million square kilometers, accounting for approximately one-quarter of the Earth's land area. Northwest my country still faces severe environmental problems related to land desertification. Currently, the treated desertified soils exhibit short-term effectiveness, unstable treatment results, and a high risk of re-degradation. Years of research have revealed that wind erosion is a significant factor contributing to land desertification in the arid and semi-arid regions of Northwest my country. Wind erosion not only reduces soil organic matter content, soil water absorption capacity, and ion exchange capacity, but also further affects regional plant growth and soil biochemical cycles, ultimately leading to desertified soil environments that severely restrict regional ecological security and sustainable socio-economic development. The application of sand-fixing technology is a crucial method for controlling soil wind erosion.

[0003] Current sand fixation methods include engineering sand fixation, vegetation sand fixation, and chemical sand fixation. However, these methods generally suffer from short-term sand fixation effects, unstable sand fixation results, and easy re-degradation of treated soil. Sand fixation agents can effectively fix shifting sand and retain water and nutrients by enhancing the cohesion between soil particles, improving soil aggregate structure, increasing the wind erosion threshold of the topsoil, and forming a three-dimensional network structure in the consolidated layer. This significantly extends the sand fixation cycle and promotes subsequent ecological restoration. However, currently developed sand fixation agents have drawbacks such as insufficient anti-aging and water erosion resistance, rapid degradation of sand fixation performance in arid environments, and the potential for secondary soil pollution due to the difficulty in degrading some polymer materials. Therefore, developing a multifunctional bio-based sand fixation agent with long-lasting and stable sand fixation effects that can simultaneously improve soil physicochemical properties and promote vegetation establishment is crucial for achieving stable, continuous, and effective sand fixation. Summary of the Invention

[0004] To address the aforementioned problems, this invention provides an ecological sand-fixing material and a sand-fixing method. The ecological sand-fixing material provided by this invention is non-toxic, harmless, and pollution-free, and has strong photodegradability. While it can stably and continuously fix sand, it can also effectively increase the organic matter content of the soil, thereby achieving ecological restoration of the soil.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: The first aspect of this invention provides an ecological sand-fixing material, wherein the ecological sand-fixing material is at least one of a primary sand-fixing agent and a secondary sand-fixing agent; By weight, the first-stage sand-fixing agent consists of 1-10 parts starch, 1-50 parts water-soluble thickener, and 0.5-10 parts nutrient synergist. The water-soluble thickener thickens the sand-fixing agent, increasing its viscosity and allowing the sand on the surface to stick together, thus preventing it from being blown away by the wind and resisting wind erosion. The nutrient synergist adjusts the water-soluble thickener, increasing the solution viscosity and making the viscosity of the compounded sand-fixing agent easier to control. It also provides the plants with the nutrients needed for growth, improving the germination rate. The second-stage sand-fixing agent is any one or more of amino acid fertilizer, humus, and seaweed fertilizer.

[0006] The components of ecological sand-fixing materials are non-toxic, harmless, and pollution-free. Because deserts are short of water, the degradation of sand-fixing agents mainly relies on photodegradation and biodegradation. After photodegradation and biodegradation, ecological sand-fixing materials will not cause pollution to the environment.

[0007] The photodegradation times of the various raw materials in the ecological sand-fixing material provided by this invention differ. The water-soluble thickener has a shorter degradation time, while the auxiliary thickener has a longer photodegradation time. Through compounding, the photodegradation time of the first-stage sand-fixing agent can be adjusted. This is because the first-stage sand-fixing agent needs to have a reasonable bonding time with the sand, ensuring the sand surface has a certain mechanical strength to effectively reduce the impact of wind erosion. For example, one year is sufficient to ensure the stability of the solidified layer during this period, providing good water and fertilizer retention capacity, which is beneficial to plant germination rate and healthy growth. However, the bonding time cannot be too long, as a long bonding time means difficult degradation and may cause soil compaction. Therefore, the degradation time can be well controlled through formula adjustment. The addition of starch increases the nutritional content of plants, promoting germination and increasing the germination rate, while also contributing to healthy plant growth. Furthermore, starch is suspended in the solution in the form of small particles, not dissolved. After spraying, the starch particles adhere to the sand surface, effectively filling the gaps between sand grains and enhancing the sand's water and fertilizer retention capacity.

[0008] Furthermore, the preparation method of the first-stage sand-fixing agent is as follows: water-soluble thickener, auxiliary thickening agent and nutrient supplement agent are added sequentially to starch aqueous solution, and the mixture is stirred to obtain the first-stage sand-fixing agent; the preparation method of the second-stage sand-fixing agent is as follows: any one or more of amino acid fertilizer, humus and seaweed fertilizer are dissolved in water to obtain the second-stage sand-fixing agent.

[0009] Furthermore, the stirring temperature is 35℃~45℃ and the stirring time is 10min~30min.

[0010] The second aspect of this invention provides an application of the aforementioned ecological environment sand-fixing material in sand fixation.

[0011] Furthermore, the aforementioned ecological environment sand-fixing material is used to resist wind erosion, improve the water retention capacity of sandy soil, improve the fertilizer retention capacity of sandy soil, or promote plant seedling growth.

[0012] The third aspect of the present invention provides a method for sand fixation, wherein after spraying the first-stage sand-fixing agent described above onto the soil surface for treatment for 3 to 12 months, a second-stage sand-fixing agent dissolved in water is sprayed onto the plant and / or soil surface.

[0013] Furthermore, the preparation method of the water-soluble two-stage sand-fixing agent is as follows: dissolve 1g~10g of the two-stage sand-fixing agent in 10L of water, and then add 0.5g~2.0g of plant decomposing enzyme to obtain the product.

[0014] Furthermore, the dosage of the first-stage sand-fixing agent is 60 kg / mu to 90 kg / mu.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention provides an ecological sand-fixing material and method. The ecological sand-fixing material is at least one of a one-stage sand-fixing agent and a two-stage sand-fixing agent. The one-stage sand-fixing agent is composed of starch, a water-soluble thickener, and a nutrient synergist. The two-stage sand-fixing agent is any one or more of amino acid fertilizer, humus, and seaweed fertilizer. The ecological sand-fixing material provided by this invention is non-toxic, harmless, and pollution-free, and has strong photodegradability. While providing stable and continuous sand fixation, it can also effectively increase the organic matter content of the soil, achieving ecological restoration of the soil. Based on the ecological sand-fixing material, this invention develops a two-stage ecological sand-fixing method that combines chemical and biological processes: a one-stage "fixation" process that forms a stable consolidation layer, and a two-stage "supplementation" process that gradually increases organic matter. This two-stage ecological sand-fixing method effectively compensates for the limitations of single-treatment models, improves the stability and sustainability of sand-fixing effects, and utilizes plant decomposition enzymes to degrade harvested plant residues, effectively increasing the organic matter content of the soil and achieving the goal of soil ecological restoration. Because the sand-fixing agent formulations of both stages are non-toxic, harmless, and pollution-free, and have strong photodegradability, the photodegradation products... The materials are non-toxic and harmless. Therefore, after the first-stage sand-fixing agent quickly fixes the soil surface, the nutrients in the second-stage sand-fixing agent formula, as well as the slow degradation of the components of the sand-fixing agent itself, can sustainably replenish the various nutrients required for plant growth, ensuring that plants can grow stably, persistently, and healthily. As the plant life cycle continues, the withered remains can continuously nourish the soil, increase the content of organic matter in the soil, and gradually improve the soil composition from the root, achieving the goal of restoring the soil ecological environment. The two-stage sand-fixing method is of great significance in the management of desertified soils and the gradual restoration of their ecological environment. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 Photos of the mold and soil.

[0018] Figure 2 The results show the soil water retention rate after 10 days of sand fixation with a first-stage sand-fixing agent.

[0019] Figure 3 The results show the soil water retention rate after 3 months of sand fixation with a first-stage sand-fixing agent.

[0020] Figure 4 The results show the soil water retention rate after 15 months of sand fixation with a single-stage sand-fixing agent.

[0021] Figure 5 The results show the soil water retention rate after 12 months of sand fixation with the two-stage sand-fixing agent.

[0022] Figure 6 This is a map of soil surface morphology (magnified 200 times). Figure 6 (a) in the text indicates that no sand fixation treatment was performed; Figure 6 (b) in the figure shows the soil surface morphology one month after treatment with the formula of Comparative Example 1; Figure 6 (c) is a soil surface morphology diagram one month after treatment with the one-stage sand-fixing agent formulated in Example 4; Figure 6 (d) in the figure is a soil surface morphology diagram nine months after treatment with the two-stage sand-fixing agent in Example 4#.

[0023] Figure 7 This is a top view of germinating wild onion seedlings; the two wild onion plants represent biological replicates.

[0024] Figure 8 This is a side view of sand onion sprouting. Detailed Implementation

[0025] The specific embodiments of the present invention are described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Unless otherwise specified, the experimental methods described in the embodiments of the present invention are conventional methods, and the materials and reagents used in the following embodiments are commercially available unless otherwise specified.

[0026] Example 1: A one-stage sand-fixing agent was prepared by mixing 10L of aqueous solution, 5g of starch, 10g of polyacrylamide, and 5g of konjac gum at 40℃ for 20 minutes.

[0027] Example 2: A one-stage sand-fixing agent was prepared by mixing 10L of aqueous solution, 5g of starch, 50g of polyacrylamide, and 5g of konjac gum at 40℃ for 20 minutes.

[0028] Example 3: A one-stage sand-fixing agent was prepared by mixing 10L of aqueous solution, 5g of starch, 50g of polyacrylamide, and 5g of locust bean gum at 40℃ for 20 minutes.

[0029] Example 4: A one-stage sand-fixing agent was prepared by mixing 10L of aqueous solution, 5g of starch, 50g of polyacrylamide, and 5g of guar gum at 40℃ for 20 minutes.

[0030] Example 5: A one-stage sand-fixing agent was prepared by mixing 10L of aqueous solution, 5g of starch, 50g of polyacrylamide, and 5g of xanthan gum at 40℃ for 20 minutes.

[0031] Example 6: A one-stage sand-fixing agent was prepared by mixing 10L of aqueous solution, 5g of starch, 50g of polyacrylamide, and 5g of gelatin at 40℃ for 20 minutes.

[0032] Comparative Example 1: 5g starch, 50g polyacrylamide, and 5g xanthan gum were mixed at 40℃ for 20 minutes to obtain a solid mixture of sand-fixing agents.

[0033] Experimental Example 1 The soil samples used in this invention were desertified soils from Damao Banner in the northwestern part of Daqingshan Mountain, Inner Mongolia. The soil particle size analyzer was used to test the particle size, and the particle size test results are shown in Table 1.

[0034] Table 1. Results of soil particle size analysis As shown in Table 1, soil particles smaller than 0.10 mm account for as much as 94.95%. Soils with these characteristics are loose in texture, well-aerated, and highly permeable, but have weak water and fertilizer retention capacity and low content of nutrients such as nitrogen, phosphorus, and potassium.

[0035] The soil inside a 50cm×50cm mold was sprayed with a first-stage sand-fixing agent according to Comparative Example 1 and Examples 1-6, respectively. The spraying conditions were kept consistent, with a control group using only the same volume of aqueous solution. The mold is as follows: Figure 1 As shown.

[0036] The sand-fixing agent in Examples 1-6 of this invention is used by spraying the sand-fixing agent onto the sand surface multiple times to make the sand surface more evenly wetted. This method has better operability and flexibility. The blank group is 10L of aqueous solution. The sand-fixing agent in Comparative Example 1 is used by mixing the sand-fixing agent with 30kg of sand, and then watering the surface with 10L of water.

[0037] (1) Study on the disappearance time of surface water after one stage of sand fixation The sand-fixing agents of Comparative Example 1 and Examples 1-6 were sprayed into the soil molds respectively. After 10 days, the soil surface had a certain mechanical strength. 1.0L of aqueous solution was sprayed onto the soil surface of each of the above molds and the blank control group mold. The time of surface water disappearance was monitored, and the state of the soil was recorded at the time of surface water disappearance.

[0038] The monitoring results of surface water disappearance time and soil condition after the first stage of sand fixation are shown in Table 2.

[0039] Table 2. Surface water disappearance time and soil condition after the first stage of sand fixation (2) Study on the thickness and compressive strength of the consolidation layer after one-stage sand fixation The thickness and compressive strength of the consolidated layer after the first stage of sand fixation were tested, and their relationship with time is shown in Tables 3 and 4, respectively. Each test was conducted three times, and the average value was taken. The mold used to test the compressive strength was a circular mold with a diameter of 1.5 cm.

[0040] Table 3. Changes in the thickness of the consolidated layer over time after the application of the first-stage sand-stabilizing agent. Table 4. Changes in compressive strength of the consolidated layer over time after application of the first-stage sand-stabilizing agent. As can be clearly seen from Tables 2, 3, and 4, the soil in Comparative Example 1 can form a consolidated layer, but under the same proportions, the consolidated layer is thinner and has weaker mechanical properties. In this invention, the first-stage sand-fixing agent in each formulation forms a consolidated layer on the soil surface, which not only enhances mechanical strength and makes the soil more resistant to wind erosion, but also increases water infiltration time. Combined with the improved water retention rate, irrigation water resources can be fully utilized for plant growth, effectively improving water resource utilization in arid environments. After 15 months of testing, the thickness and compressive strength of the consolidated layer decreased due to the degradation of some components, but it still maintains a stable consolidated layer structure and can resist the effects of wind erosion.

[0041] (3) Study on the water retention capacity of sand after one-stage sand fixation Water retention capacity such as Figure 2 , Figure 3 , Figure 4 As shown.

[0042] Water retention rate = (total weight of sand after watering - weight of dry sand before watering) / weight of dry sand before watering × 100%.

[0043] Test conditions: Temperature 20℃, humidity 30%.

[0044] Figure 2 To prepare the consolidation layer for Comparative Example 1, Examples 1-6 and the blank group (10 days after the first-stage sand-stabilizing agent was sprayed), 1L of clean water was sprayed onto the sand surface, and the total weight of the sand was tested every 1 hour.

[0045] from Figure 2 As can be seen, after treatment with the sand-fixing agent, the water retention capacity of Comparative Example 1 is significantly lower than that of Examples 1-6 of the present invention, while the water retention rate of the soil consolidation layer in Examples 1-6 is the highest, approaching 90%. Furthermore, 10 hours after spraying with clean water, the water retention rate of the soil consolidation layer in Examples 2-5 is still above 60%, indicating that the sand-fixing agent has excellent water retention performance.

[0046] Figure 3 To prepare the consolidated layer (3 months after the first-stage sand-stabilizing agent was sprayed) of Comparative Example 1, Examples 1-6 and the blank control group, 1L of clean water was sprayed on the sand surface, and the total weight of the sand was tested every 1 hour.

[0047] from Figure 3 As can be seen, after treatment with the sand-fixing agent, the water retention capacity of Comparative Example 1 is significantly lower than that of Examples 1-6 of the present invention. Even after 3 months, the water retention rate of the soil consolidation layer in Examples 1-6 is still above 75%. Furthermore, 10 hours after spraying with clean water, the water retention rate of the soil consolidation layer in Examples 2-5 is still above 40%, indicating that the sand-fixing agent of the present invention has excellent water retention performance.

[0048] Figure 4 To prepare the consolidation layer (one-stage sand-stabilizing agent sprayed for 15 months) for Comparative Example 1, Examples 1-6 and the blank control group, 1L of clean water was sprayed on the sand surface, and the total weight of the sand was tested every 1 hour.

[0049] from Figure 4 As can be seen, after treatment with the sand-fixing agent, the water retention capacity of Comparative Example 1 is significantly lower than that of Examples 1-6 of the present invention. Even after 15 months, the water retention rate of the soil consolidation layer in Examples 1-6 remains above 65%. Furthermore, 10 hours after spraying with clean water, the water retention rate of the soil consolidation layer in Examples 2-5 is still above 30%, indicating that the sand-fixing agent of the present invention has excellent water retention performance.

[0050] (4) Study on the physical and chemical properties of soil after one-stage sand fixation One month after the first stage of sand fixation, a consolidation layer was formed in the soil. Soil samples with a thickness of 0.6cm ± 0.05cm were taken for physicochemical property testing. The test results are shown in Table 5.

[0051] Table 5. Test results of soil physicochemical properties in the first-stage sand-fixing agent consolidation layer (1 month) Table 6. Test results of soil physicochemical properties in the first-stage sand-fixing agent consolidation layer (15 months) Performance of the consolidated layer after the application of the second-stage sand-fixing agent: Comparative Example 1 did not undergo two-stage sand fixation treatment. The following are the formula numbers for Examples 1-6 after two-stage treatment.

[0052] Example 1#: In Example 1, when the first-stage sand fixation cycle is 90 days, the second-stage sand fixation agent is sprayed. The formula of the second-stage sand fixation agent is 5g amino acid fertilizer, 5g humus, and the plants are mechanically harvested once, and 1.0g plant decomposition enzyme is added.

[0053] Example 2#: In Example 2, when the first-stage sand fixation cycle is 90 days, the second-stage sand fixation agent is sprayed. The formula of the second-stage sand fixation agent is 5g of amino acid fertilizer and 5g of humus. The plants are mechanically harvested once, and 1.0g of plant decomposing enzyme is added.

[0054] Example 3#: In Example 3, when the first-stage sand fixation cycle is 90 days, the second-stage sand fixation agent is sprayed. The second-stage sand fixation agent formula is 5g amino acid fertilizer and 5g humus. The plants are mechanically harvested once, and 1.0g plant decomposition enzyme is added.

[0055] Example 4#: In Example 4, when the first-stage sand fixation cycle is 90 days, the second-stage sand fixation agent is sprayed. The second-stage sand fixation agent formula is 5g amino acid fertilizer and 5g humus. The plants are mechanically harvested once, and 1.0g plant decomposition enzyme is added.

[0056] Example 5#: In Example 5, when the first-stage sand fixation cycle is 90 days, the second-stage sand fixation agent is sprayed. The second-stage sand fixation agent formula is 5g amino acid fertilizer and 5g humus. The plants are mechanically harvested once, and 1.0g plant decomposition enzyme is added.

[0057] Example 6#: In Example 6, when the first-stage sand fixation cycle is 90 days, the second-stage sand fixation agent is sprayed. The second-stage sand fixation agent formula is 5g amino acid fertilizer and 5g humus. The plants are mechanically harvested once, and 1.0g plant decomposition enzyme is added.

[0058] Experiment Example 2 (1) Study on the thickness and compressive strength of the consolidation layer after two-stage sand fixation Table 7. Changes in the thickness of the consolidated layer over time after the application of the second-stage sand-fixing agent. Comparing Tables 3 and 7, it can be seen that the thickness of the consolidated layer after the two-stage sand-fixing agent treatment increases with time, indicating that the consolidated layer after the two-stage sand-fixing agent treatment is more stable and has a stronger wind erosion resistance.

[0059] Table 8. Changes in the compressive strength of the consolidated layer over time after the application of the second-stage sand-fixing agent. Comparing Tables 4 and 8, it can be seen that the compressive strength of the consolidated layer after the two-stage sand-fixing agent treatment increases with time, which is directly related to the increase in the thickness of the consolidated layer. However, the increased compressive strength does not affect the germination rate of the plants.

[0060] (2) Study on the water retention capacity of sand after two-stage sand fixation contrast Figure 3 , Figure 4 and Figure 5 It can be seen that after two-stage sand-fixing agent treatment, even 12 months later, the water retention rate of the soil consolidation layer in Examples 1#-6# remained above 70%, while the highest water retention rate in Examples 2#-5# reached above 80%. Furthermore, 10 hours after spraying with clean water, the water retention rate of the soil consolidation layer in Examples 2#-5# was still above 55%. This indicates that the soil treated by the two-stage sand-fixing method of this invention has good water retention performance and high stability, which is more conducive to coping with water-scarce desert climates and to the comprehensive utilization of scarce water resources in deserts.

[0061] (3) Study on the physical and chemical properties of soil after two-stage sand fixation After the second stage of sand fixation, a consolidation layer is formed in the soil. After the plants have basically completed their decomposition on the soil surface, soil samples with a thickness of 0.6cm ± 0.05cm are taken and their physicochemical properties are tested. The test results are shown in Table 9.

[0062] Table 9. Test results of physical and chemical properties of soil in the second-stage sand-fixing layer. Comparing Tables 5, 6, and 9, it is evident that the nitrogen content of the soil has significantly increased due to the application of amino acid fertilizer. The organic carbon content and organic matter content have also significantly increased because plant residues decompose into organic matter and enter the soil. The pH value of the soil has changed very little, indicating that the two-stage sand-fixing agent has almost no effect on the acidity or alkalinity of the soil.

[0063] Figure 6 Image showing the surface morphology of soil after treatment with sand-fixing agent (magnified 200x). From Figure 6 As can be seen in (a), the sand that has not undergone sand fixation treatment is loose, with large gaps between sand grains, meaning it has poor water and fertilizer retention capacity. Figure 6 As can be seen in (b) of the comparison example, the sand surface after one month of treatment with the formula in Comparative Example 1 exhibits a certain degree of adhesion, indicating improved water and fertilizer retention capacity. Figure 6 As can be seen in (c), after one month of treatment with the first-stage sand-fixing agent corresponding to the formulation of Example 4, the sand surface exhibits significant adhesion, with some starch adhering to the sand grain surface. Simultaneously, a relatively continuous fine filamentous network structure is formed, and the gaps between sand grains are filled by the sand-fixing component. This adhesion, network structure, and gap-filling effectively improve the mechanical properties of the consolidated layer and enhance its water and fertilizer retention capacity. Figure 6 As can be seen in (d) of Example 4#, after a three-month first-stage sand-fixing agent treatment, followed by a nine-month second-stage sand-fixing agent treatment, for a total of one year of sand-fixing treatment, the sand surface still has a certain degree of stickiness. However, some components, such as starch, should have decomposed, and no obvious components filling the gaps are visible. However, there are still a small number of fine filaments on the surface. The adhesiveness and filament structure can enhance the stability of the already formed solidified layer and effectively resist the effects of wind erosion.

[0064] Figure 7 and 8 The image shows the planting of sand onions in soil after two stages of sand-fixing agent treatment. As can be seen from the image, the plants are growing well.

[0065] It should be noted that when numerical ranges are involved in this invention, it should be understood that both endpoints of each numerical range and any value between the two endpoints can be selected. Since the steps and methods used are the same as in the embodiments, preferred embodiments are described here to avoid redundancy. Although preferred embodiments of the invention have been described, those skilled in the art, once they understand the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this invention.

[0066] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. An ecological sand-fixing material, characterized in that, The ecological environment sand-fixing material is at least one of a primary sand-fixing agent and a secondary sand-fixing agent; The first-stage sand-fixing agent, by weight, consists of 1 to 10 parts starch, 1 to 50 parts water-soluble thickener, and 0.5 to 10 parts nutrient enhancer; the second-stage sand-fixing agent is any one or more of amino acid fertilizer, humus, and seaweed fertilizer. The water-soluble thickener is any one or more of polyacrylamide, hydroxypropyl methylcellulose, hydroxypropyl cellulose, and sodium carboxymethyl cellulose. The nutrient enhancer is any one or more of xanthan gum, locust bean gum, konjac gum, gelatin, guar gum, gum arabic, and carrageenan.

2. The ecological environment sand-fixing material according to claim 1, characterized in that, The preparation method of the first-stage sand-fixing agent is as follows: water-soluble thickener, auxiliary thickening agent and nutrient supplement agent are added sequentially to starch aqueous solution, and the mixture is stirred to obtain the first-stage sand-fixing agent; the preparation method of the second-stage sand-fixing agent is as follows: any one or more of amino acid fertilizer, humus and seaweed fertilizer are dissolved in water to obtain the second-stage sand-fixing agent.

3. The ecological environment sand-fixing material according to claim 2, characterized in that, The stirring temperature is 35℃~45℃ and the stirring time is 10min~30min.

4. The application of the ecological environment sand-fixing material according to claim 1 in sand fixation.

5. The application according to claim 4, characterized in that, The aforementioned ecological environment sand-fixing materials are used to resist wind erosion, improve the water retention capacity of sandy soil, improve the fertilizer retention capacity of sandy soil, or promote plant seedling growth.

6. A method for sand fixation, characterized in that, The process includes the following steps: spraying the first-stage sand-fixing agent described in claim 1 onto the soil surface for treatment for 3 to 12 months, and then spraying the water-soluble second-stage sand-fixing agent onto the plants and / or soil surface.

7. The sand fixation method according to claim 6, characterized in that, The preparation method of the water-soluble two-stage sand-fixing agent is as follows: dissolve 1g~10g of the two-stage sand-fixing agent in 10L of water, and then add 0.5g~2.0g of plant decomposing enzyme to obtain the product.

8. The sand fixation method according to claim 6, characterized in that, The dosage of the first-stage sand-fixing agent is 60 kg / mu to 90 kg / mu.

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