Method for restoring vegetation in sandy areas

Abstract

This disclosure provides a method for restoring vegetation in sandy areas. The method includes: adding a soil conditioner to sandy areas in alpine desert steppe regions where photovoltaic power stations are located; sowing plant seeds in the sandy areas where the soil conditioner has been added; laying straw mats as sand barriers on the sandy areas where plant seeds have been sown; and irrigating the sandy areas where straw mats as sand barriers have been laid. This method can improve the restoration efficiency of vegetation in sandy areas in alpine desert steppe regions where photovoltaic power stations are located.

Description

Technical Field

[0001] This disclosure relates to the field of desert vegetation restoration technology, and in particular to a method for restoring desert vegetation. Background Technology

[0002] The high-altitude desert grassland region of the Qinghai-Tibet Plateau possesses abundant natural resources such as land and solar energy, giving it unique advantages for developing photovoltaic power. It is an important planning and construction area for new energy bases in my country. However, this region suffers from scarce water resources, arid and infertile soil, frequent wind and sandstorms, and a weak ecosystem with low resistance to disturbance. Natural restoration after local surface damage from photovoltaic power station construction is difficult. In addition, the local "narrowing" effect of photovoltaic power stations triggers secondary wind and sand disasters. Frequent surface wind and sand activities restrict the natural vegetation restoration process, while also threatening the safe operation of power stations and reducing photovoltaic power generation efficiency. Therefore, it is urgent to restore the sandy vegetation of photovoltaic power stations in the short term through artificial intervention.

[0003] Currently, the technology for rapid vegetation restoration in sandy areas near photovoltaic power stations in this region is not yet perfect. Existing measures such as mechanical sand barriers, vegetation measures, and chemical sand fixation have limited effectiveness in promoting rapid vegetation restoration at power stations, making it difficult to achieve coordinated development between photovoltaic power generation systems and the ecological environment.

[0004] It is evident that improving the restoration efficiency of sandy vegetation in alpine desert grassland areas with photovoltaic power stations is a technical issue worthy of attention. Summary of the Invention

[0005] To overcome the problems existing in the related technologies, this disclosure provides a method for restoring vegetation in sandy areas.

[0006] According to a first aspect of the present disclosure, a method for restoring vegetation in sandy areas is provided, the method comprising: Add soil conditioner to sandy land in high-altitude desert grassland areas where photovoltaic power stations are located; Plant seeds were mixed and sown in sandy soil where soil conditioner had been added; Lay straw mats as sand barriers on the sandy ground where plant seeds have already been mixed. Irrigate the sandy land where straw mats and sand barriers have been laid.

[0007] In some alternative implementations, the soil conditioner includes one or more of sand-fixing and water-retaining materials, base fertilizers, and chemical fertilizers.

[0008] In some optional embodiments, the sand-fixing and water-retaining material is Artemisia argyi, with a purity greater than or equal to 99.9%, and the viscosity of a 1% (by mass) solution of Artemisia argyi is greater than or equal to 900 Pa·s; the base fertilizer is well-rotted cow and sheep manure, with a moisture content less than or equal to 30%, a roundworm egg mortality rate greater than or equal to 95%, and the cow and sheep manure has undergone harmless treatment, with the ratio of the number of viable Escherichia coli after harmless treatment to the number of viable Escherichia coli before harmless treatment being less than or equal to one-tenth; the chemical fertilizer is urea.

[0009] In some alternative implementations, the amount of soil conditioner added per acre of sandy land is 1500-2000 kg of cow or sheep manure, 30-35 kg of urea, and 10-12 kg of Artemisia argyi gum.

[0010] In some alternative implementations, the plant seeds include a target species and a companion species; wherein the ratio of the target species to the companion species is 8:2.

[0011] In some alternative implementations, the target species include crested wheatgrass, Kentucky bluegrass, fescue, and Qinghai sand-fixing grass, with a sowing rate of 7-8 kg / ha for crested wheatgrass, 3-4 kg / ha for Kentucky bluegrass, 3-4 kg / ha for fescue, and 3-4 kg / ha for Qinghai sand-fixing grass; the associated species include oats and highland barley, with a sowing rate of 2.8-3.2 kg / ha for oats and 2.8-3.2 kg / ha for highland barley.

[0012] In some alternative implementations, the straw curtain sand barrier is made of at least one type of straw selected from wheat straw, rice straw, and reeds, with a single straw having a breaking strength greater than or equal to 15 Newtons and a moisture content of 15%-20%. The width of the straw curtain sand barrier is 1-2 meters, the length is 6-15 meters, the thickness is 2-3 centimeters, and the area covered by the straw curtain sand barrier per acre of sandy land is 800-1000 square meters.

[0013] In some alternative implementations, a straw mat sand barrier is laid on the sandy ground where plant seeds have been mixed, including: Wooden stakes were driven into the sandy land where plant seeds had been mixed and compacted according to the target distance. The target distance was determined based on the wind force and dune stability in the alpine desert steppe region. Lay straw mats on the sandy ground where the wooden stakes have been driven in and compacted, following the direction in which the stakes are set. Use wire or rope to bind straw mats to wooden stakes to form a straw mat sand barrier; or bury the edges of the straw mats to form a straw mat sand barrier.

[0014] In some alternative implementations, dune stability is determined based on at least one of the following: Vegetation coverage, windward slope of dunes, natural angle of repose of sand in dunes, mass moisture content of dunes, average particle size of sand in dunes, and annual sand transport potential.

[0015] In some alternative implementations, irrigation is carried out on sandy land that has been covered with straw mats and sand barriers, including: For sandy land that has been covered with straw mats and sand barriers, carry out the first irrigation so that the water depth of the sandy land after the first irrigation is greater than or equal to 5 cm. Within a preset timeframe from the first irrigation to the period following the first irrigation, the sandy land is watered a preset number of times per week.

[0016] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: In this embodiment, by adding soil conditioner to the sandy land in the alpine desert steppe area where a photovoltaic power station is located, favorable soil conditions are created for subsequent plant growth. By sowing plant seeds in the sandy land with added soil conditioner, a composite vegetation system is formed. By laying straw mats and sand barriers on the sown sandy land, surface wind and sand activity is effectively reduced, protecting plant seeds and seedlings and creating a more stable environment for natural vegetation restoration. Irrigation of the sandy land with straw mats and sand barriers ensures the water conditions required for seed germination and seedling growth, accelerating the vegetation restoration process. Therefore, by comprehensively considering the climate, vegetation, and soil characteristics of the alpine desert steppe area, as well as the local wind and sand activity patterns of the photovoltaic power station area, the limitations of single measures in promoting rapid vegetation restoration at power stations are overcome. This combination of multiple measures improves the vegetation restoration efficiency in the sandy land of the alpine desert steppe area where photovoltaic power stations are located.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0018] The accompanying drawings, which are incorporated in and form part of this disclosure, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0019] Figure 1 This is a flowchart illustrating a method for restoring vegetation in sandy areas according to an exemplary embodiment.

[0020] Figure 2 This is a flowchart illustrating another method for restoring vegetation in sandy areas according to an exemplary embodiment of this disclosure.

[0021] Figure 3 This is a flowchart illustrating yet another method for restoring vegetation in sandy areas according to an exemplary embodiment of this disclosure. Detailed Implementation

[0022] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0023] The terminology used in this disclosure is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The singular forms “a,” “the,” and “the” as used in this disclosure and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any and all possible combinations of one or more of the associated listed items.

[0024] It should be understood that although the terms first, second, third, etc., may be used in this disclosure to describe various information, such information should not be limited to these terms. These terms are used only to distinguish information of the same type from one another. For example, without departing from the scope of this disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "when," "when," or "in response to determination."

[0025] The embodiments of this disclosure will now be described in detail.

[0026] Figure 1 This is a flowchart illustrating a method for restoring vegetation in sandy areas according to an exemplary embodiment.

[0027] like Figure 1 As shown, the method specifically includes: Step 101: Add soil conditioner to the sandy land in the alpine desert grassland area where photovoltaic power stations are located.

[0028] In this embodiment, the photovoltaic power station can be a photovoltaic power generation facility built in the high-altitude, cold desert grassland area of ​​the Qinghai-Tibet Plateau. It can utilize the abundant solar thermal resources of this region to generate electricity. In practice, due to the local funneling effect of photovoltaic power stations, secondary wind and sand disasters are often triggered. The local funneling effect of photovoltaic power stations is a phenomenon in which the terrain or array layout causes the airflow channel to narrow, thereby increasing the wind speed locally. This effect intensifies wind and sand activity, accelerates the transport of surface sand particles, and promotes vegetation degradation.

[0029] The alpine desert steppe region is a geographical area characterized by scarce water resources, arid and infertile soil, frequent wind and sandstorms, and a weak ecosystem resistance to disturbance. In some alternative implementation methods, the alpine desert steppe region has an average annual temperature of around 0℃, extremely low annual precipitation (only 100-200 mm, or even less), low humidity (e.g., 0.13-0.3), and strong winds.

[0030] Sandy land can be desertified land formed after local surface damage during the construction of photovoltaic power stations.

[0031] Soil conditioners can be used to improve the properties of sandy soils.

[0032] In some alternative implementation methods, the soil conditioner can be evenly spread on the sandy land manually; or, the soil conditioner can be evenly spread on the sandy land mechanically.

[0033] In some alternative implementation methods, one can choose a sunny and windless day in April or May before or after rain, and use manual or mechanical methods to evenly spread the prepared soil conditioner on the sandy land. Then, use a rotary tiller to loosen the top 20 cm and apply the soil conditioner into the soil to build a composite improvement layer. This layer combines water retention and seepage prevention, slow nutrient release, and initial consolidation of the sand surface, creating better soil physical and chemical conditions for sand fixation planting and seed survival rate.

[0034] Step 102: Sow plant seeds in the sandy soil where soil conditioner has been added.

[0035] In this embodiment, plant seeds are used to form vegetation cover and restore ecosystem functions.

[0036] Mixed sowing refers to the practice of mixing different plant seeds in a specific ratio and then sowing them uniformly. Through mixed sowing, multi-species symbiotic vegetation communities can be constructed.

[0037] In some alternative implementations, mechanized sowing can be carried out by using a seeder to mix plant seeds in sandy soil with added soil conditioner; or, plant seeds can be mixed in proportion and then manually sown in sandy soil with added soil conditioner.

[0038] Step 103: Lay straw mats and sand barriers on the sandy ground where plant seeds have been mixed.

[0039] In this embodiment, the straw curtain sand barrier can be a windbreak and sand-fixing facility made of one or more types of straw. The straw curtain sand barrier can reduce wind erosion, protect seeds and seedlings, and regulate the microenvironment.

[0040] Wooden stakes can be used to secure the straw mats and maintain the stability of the straw mat sand barrier.

[0041] In some alternative implementations, the straw mats can be laid on the sandy ground where plant seeds have been mixed along a preset direction, so that the straw mats are tightly connected.

[0042] In some alternative implementations, the specifications of the straw mat can be set according to the spacing of the photovoltaic array.

[0043] Specifically, firstly, the photovoltaic array spacing can be determined using the following formula (1): D1=L1×cosβ+H1 / tanα1(1) In formula (1), D1 represents the minimum north-south spacing of the photovoltaic array (i.e., the aforementioned photovoltaic array spacing), which refers to the minimum distance that the front and rear photovoltaic arrays need to maintain in the north-south direction. The purpose is to ensure that the front array will not shade the rear array during the period from 9:00 to 15:00 on the winter solstice. L1 represents the length of the inclined plane of a single module, in meters (m). The photovoltaic array is an overall power generation unit composed of multiple single modules connected in series or parallel. In other words, a single module is the basic unit of the array. β represents the module installation tilt angle, in degrees (°). H1 represents the vertical height difference between the highest point of the front row and the lowest point of the rear row, H1 = h + L1 × sinβ. Here, h represents the height of the bottom edge of the module from the ground, in meters (m). α1 represents the solar altitude angle, sinα1=sinφ1sinδ+cosφ1cosδcosω, where φ1 represents the latitude of the photovoltaic array location in degrees (°), φ1 is positive in the Northern Hemisphere, δ represents the declination angle, approximately -23.45° on the winter solstice, and ω represents the hour angle, -45° at 9:00 and 45° at 15:00.

[0044] Furthermore, when the latitude is ≤45°, the above formula (1) can also be approximately replaced by the following formula (2): D1≈H1×cotα1(2) In formula (2), the same symbols as in formula (1) can have the same meaning, which will not be repeated here. cotα1=1 / tanα1.

[0045] Furthermore, the specifications of the straw mats can be determined in the following manner. The specifications of the straw mats include: the length of the straw mats along the array direction (L2), the width of the straw mats laid perpendicular to the wind direction (W), the thickness of the straw mats (T), and the amount of straw mats used (Q).

[0046] The formula for calculating the length L2 of the straw mat is shown in formula (3): L2=k l ×D1(3) In formula (3), D1 represents the photovoltaic array spacing, k l The conversion factor is 2.0 to 2.5.

[0047] The formula for calculating the width W of the straw mat is shown in formula (4): W=k w ×D1(4) In formula (4), D1 represents the photovoltaic array spacing; k w This is the width coefficient, ranging from 0.15 to 0.25.

[0048] The formula for calculating the thickness T of the straw mat is shown in formula (5): T=k t ×v 0.5 (5) In formula (5), k t represents the thickness coefficient, which is 0.2 for sandy areas; v is the maximum wind speed in the project area once every 50 years, in meters per second (m / s).

[0049] The formula for calculating the amount of straw mat Q is shown in formula (6) or formula (7): Q=(A×ρ) / η(6) In formula (6), A is the area to be laid; ρ is the surface density of the straw mat, in kilograms per square meter (kg / m²), which is 1.2 to 1.8 kg / m² in desert areas and 2.0 to 2.5 kg / m² in areas with strong winds; η is the utilization rate, for example 0.85, or, for conventional laying and overlapping, η = 0.85 to 0.90, for windy and sandy areas where overlapping needs to be dense, η = 0.80 to 0.85, and for poor construction conditions and a lot of cutting, η = 0.75 to 0.80.

[0050] Q = A × q (7) In formula (7), A is the paving area and q is the recommended value for sandy areas, which is 12-15 kg / m².

[0051] Step 104: Irrigate the sandy land where straw mats and sand barriers have been laid.

[0052] In this embodiment, irrigation can be an artificial water supply operation performed on the vegetation restoration area. Irrigation is used to ensure the water conditions required for seed germination and seedling growth.

[0053] The watering depth can be the vertical depth to which water penetrates the soil.

[0054] In some alternative implementation methods, manual watering or mechanical sprinkler irrigation can be used to irrigate the sandy land that has been covered with straw mats and sand barriers.

[0055] In some optional implementations of this embodiment, the soil conditioner includes one or more of sand-fixing and water-retaining materials, base fertilizer, and chemical fertilizer.

[0056] Sand-fixing and water-retaining materials are materials that can fix sand particles and retain moisture. Their function is to enhance the structural stability of sandy land and improve its water retention capacity.

[0057] Base fertilizer can be organic fertilizer. Its function is to provide organic matter and slow-release nutrients needed for plant growth, thereby improving soil structure.

[0058] Chemical fertilizers are chemical fertilizers that provide fast-acting nutrients. Their function is to quickly replenish the nutrients such as nitrogen, phosphorus, and potassium needed for plant growth.

[0059] It is understandable that by limiting soil conditioners to include one or more of sand-fixing and water-retaining materials, base fertilizers, and chemical fertilizers, a composite material with complementary functions is formed. Sand-fixing and water-retaining materials provide physical consolidation and water retention functions, base fertilizers provide organic matter and slow-release nutrients, and chemical fertilizers provide readily available nutrients. The synergistic effect of these three components can enhance the water retention capacity, nutrient supply capacity, and structural stability of sandy soils, creating a better soil environment for plant seed germination and seedling growth, and further improving vegetation restoration efficiency and survival rate.

[0060] In some application scenarios of the above-mentioned optional implementation methods, the sand-fixing and water-retaining material is Artemisia argyi, with a purity of ≥99.9% and a viscosity of 1% by mass of the solution prepared from Artemisia argyi greater than or equal to 900 Pa·s; the base fertilizer is well-rotted cow and sheep manure, with a moisture content of ≤30%, a roundworm egg mortality rate of ≥95%, and the cow and sheep manure has undergone harmless treatment, with the ratio of the number of viable E. coli after harmless treatment to the number of viable E. coli before harmless treatment being less than or equal to one-tenth; the chemical fertilizer is urea.

[0061] Artemisia argyi is a gelatinous material extracted from Artemisia argyi plants. It has high viscosity and film-forming properties, which can solidify sand particles and reduce moisture evaporation.

[0062] The purity of Artemisia argyi gum can be determined by the percentage of the mass content of the active ingredients in Artemisia argyi gum.

[0063] The viscosity of the adhesive solution can be used as an indicator of the flow resistance of the Artemisia argyi solution. The viscosity of the adhesive solution can be used to measure the sand-fixing ability of the Artemisia argyi; the higher the viscosity, the better the sand-fixing effect.

[0064] Composting is a process of rendering cow and sheep manure harmless. Composting can kill pathogens and parasite eggs, reducing toxicity to plants.

[0065] Moisture content can be defined as the percentage of water by mass in cow or sheep manure. Moisture content can affect the storage stability and application effectiveness of base fertilizer.

[0066] The ascarid egg mortality rate represents the proportion of ascarid eggs in cattle and sheep manure that have been inactivated after composting. The ascarid egg mortality rate can measure the degree of harmlessness achieved through composting.

[0067] The coliform count can be used as an indicator of the degree of E. coli contamination in cattle and sheep manure. The coliform count can be used to evaluate the hygiene and safety of base fertilizer.

[0068] Urea is a nitrogen fertilizer. Urea can provide the nitrogen needed for plant growth and promote rapid plant growth.

[0069] It is understandable that by specifying the sand-fixing and water-retaining material as high-purity (≥99.9%) and high-viscosity (1% adhesive viscosity ≥900 Pa·s) Artemisia argyi adhesive, better sand surface consolidation and water retention performance can be ensured. By specifying the base fertilizer as well-rotted cow and sheep manure that meets the three indicators of moisture content (≤30%), ascarid egg mortality rate (≥95%), and coliform count (≤1 / 10), effective supply of organic matter can be guaranteed, while eliminating the risk of disease and pest transmission. By specifying the chemical fertilizer as urea, a more precise and fast-acting nitrogen source can be provided. As a result, the performance of each component of the soil conditioner is more reliable, which can enhance the water retention and seepage prevention, nutrient slow release, and initial sand surface consolidation functions of the composite improvement layer, providing a safer, more stable, and more efficient soil foundation for vegetation restoration.

[0070] In some of the above application scenarios, the amount of soil conditioner added per acre of sandy land is 1500-2000 kg of cow and sheep manure, 30-35 kg of urea, and 10-12 kg of Artemisia argyi gum.

[0071] The dosage can be the application weight of each component of the soil conditioner per acre of sandy land. By controlling the dosage of the soil conditioner, it is possible to ensure the synergistic effect of each component and avoid insufficient dosage leading to weakened effect or excessive dosage leading to waste of resources.

[0072] In some alternative implementation methods, 1500-2000 kg of prepared cattle and sheep manure base fertilizer, 30-35 kg of urea, and 10-12 kg of Artemisia argyi gum per mu can be evenly spread on the ground surface by manual or mechanical means. The top 20 cm of soil can be loosened with a rotary tiller, and the manure, nitrogen fertilizer, and Artemisia argyi gum can be applied into the sandy soil.

[0073] It is understandable that limiting the amount of cow and sheep manure (1500-2000 kg), urea (30-35 kg), and Artemisia argyi gum (10-12 kg) added per acre of sandy land can achieve a better ratio among the three. This ratio ensures that Artemisia argyi gum forms an effective consolidation layer, that cow and sheep manure provides sufficient organic matter and slow-release nutrients, and that urea supplements an appropriate amount of nitrogen. The three work together to construct a stable, nutrient-balanced, and water-retaining soil layer, which can improve soil improvement efficiency and avoid resource waste.

[0074] In some optional implementations of this embodiment, the plant seeds include a target species and a companion species; wherein the ratio of the target species to the companion species is 8:2. In some optional implementations, the total sowing amount of the target species and the companion species is 22 kg per hectare.

[0075] The target species can be seeds of perennial herbaceous plants used to establish long-term stable vegetation communities. Target species can be used to achieve sustainable sand fixation and functional restoration of sandy ecosystems.

[0076] Associated species can be annual plant seeds used to provide short-term protection and soil improvement. They can be used to quickly form ground cover, protect seedlings of the target species, and improve soil fertility.

[0077] The ratio of the target species to the associated species can be the mass ratio of the target species to the associated species.

[0078] The total seeding rate can be the sum of the target species and associated species seeds per hectare of sandy land. The total seeding rate can be used to control vegetation density, avoiding overly dense vegetation leading to competition or overly sparse vegetation leading to insufficient cover.

[0079] It is understandable that by clearly classifying plant seeds into target species and associated species, and limiting the ratio of the two to 8:2 with a total sowing amount of 22 kg per hectare, the target species can ensure long-term ecological restoration effects, while the associated species can provide the cover environment and environmental regulation for the target species in the early stages of germination. The above ratio and sowing amount can more effectively balance the interspecific competition and synergistic effect, improve the overall seed germination rate and seedling survival rate, and improve the vegetation cover efficiency of the aforementioned sandy land.

[0080] In some application scenarios of the above-mentioned optional implementation methods, the target species include crested wheatgrass, Kentucky bluegrass, fescue, and Qinghai sand-fixing grass. The sowing rate of crested wheatgrass is 7-8 kg per hectare (e.g., 7.5 kg), the sowing rate of Kentucky bluegrass is 3-4 kg per hectare (e.g., 3.75 kg), the sowing rate of fescue is 3-4 kg per hectare (e.g., 3.75 kg), and the sowing rate of Qinghai sand-fixing grass is 3-4 kg per hectare (e.g., 3.75 kg). The associated species include oats and highland barley. The sowing rate of oats is 2.8-3.2 kg per hectare, and the sowing rate of highland barley is 2.8-3.2 kg per hectare.

[0081] Leymus chinensis, Kentucky bluegrass, fescue, and Qinghai sand-fixing grass are seeds of perennial grasses adapted to the environment of alpine desert steppe (low temperature, drought, and strong radiation). As target species, Leymus chinensis, Kentucky bluegrass, fescue, and Qinghai sand-fixing grass can form a stable vegetation layer with well-developed root systems and strong stress resistance.

[0082] Oats and barley are annual cereal crops with short growth cycles and large biomass. As companion species, oats and barley can germinate rapidly to form initial cover.

[0083] In some alternative implementation methods, when the target species, crested wheatgrass, Kentucky bluegrass, fescue, and Qinghai sand-fixing grass are mixed, the sowing rates are 7.5 kg, 3.75 kg, 3.75 kg, and 3.75 kg, respectively. After conversion at a ratio of 0.8, the mixed sowing rate is 15 kg. When the associated species, oats and highland barley are mixed, the sowing rate is 15 kg each. After conversion at a ratio of 0.2, the mixed sowing rate is 6 kg.

[0084] It is understandable that by limiting the target species to *Leymus chinensis*, *Poa chinensis*, *Festuca aquifolioides*, and *Agrostis qinghaiensis* and sowing them at the aforementioned rates, the characteristics of each grass species (such as root depth and phenological differences) can be fully utilized to enhance the community's resilience and stability. Furthermore, by limiting the companion species to oats and barley and sowing them at the aforementioned rates, the advantages of their growth rates and morphological structures can be leveraged. This seed combination and ratio design can match the climate and soil characteristics of alpine desert steppe areas, enabling the vegetation community to possess both faster establishment capacity and longer-term ecological functions, thereby improving the targeting, effectiveness, and sustainability of the aforementioned sandy land vegetation restoration.

[0085] In some of the application scenarios of the above-mentioned optional implementation methods, the plants sprouting from the companion species are used to increase the organic matter in the sandy land and to provide shade for the plants sprouting from the target species.

[0086] Organic matter can be the substance formed after the decomposition of associated plants. Organic matter can improve the soil structure of sandy areas and enhance their water and fertilizer retention capacity.

[0087] It is understandable that increasing the organic matter in sandy soil can improve soil fertility and structure, providing nutrients for the growth of the target species. Providing shade for the germinating plants of the target species can reduce the risk of seedling damage caused by water loss and the funneling effect, thereby improving the survival rate of the seedlings.

[0088] In some optional implementations of this embodiment, the straw curtain sand barrier is made of at least one of wheat straw, rice straw and reeds, with a single straw having a breaking strength greater than or equal to 15 Newtons and a straw moisture content of 15%-20%; the width of the straw curtain sand barrier is 1-2 meters, the length of the straw curtain sand barrier is 6-15 meters, the thickness of the straw curtain sand barrier is 2-3 centimeters, and the area of ​​straw curtain sand barrier used per acre of sandy land is 800-1000 square meters.

[0089] Wheat straw, rice straw, and reeds can be the dried stems of harvested crops or wetland plants. They can be used as raw materials for weaving straw mats and sand barriers, providing basic mechanical support and covering functions. In some alternative implementations, fresh, mold-free, and pest-free straws such as wheat straw, rice straw, and reeds can be used for straw mats and sand barriers.

[0090] Breaking strength can be defined as the maximum tensile force that a single straw can withstand when it breaks in a tensile test.

[0091] Moisture content is the percentage of water mass in straw relative to its total mass. Moisture content helps balance the flexibility and durability of straw mats; too low a moisture content makes the straw brittle and prone to breakage, while too high a moisture content makes the straw susceptible to mold.

[0092] It is understandable that by limiting the raw materials of straw curtain sand barriers (at least one of wheat straw, rice straw, and reed), the mechanical properties of the straw (breaking strength ≥15 N), the moisture content (15%-20%), and the parameters (width 1-2 meters, length 6-15 meters, thickness 2-3 centimeters, and a usage area of ​​800-1000 square meters per acre), it is possible to ensure that straw curtain sand barriers have stronger wind erosion resistance and environmental adaptability, thereby improving the durability of windbreak and sand fixation measures.

[0093] In some application scenarios of the above-mentioned optional implementation methods, the following method can be used to lay straw mats as sand barriers on sandy ground where plant seeds have been mixed: The first step is to drive wooden stakes into the sandy soil where plant seeds have been mixed and sown at the target distance and compact them.

[0094] The target distance is determined based on the wind force and sand dune stability in the alpine desert steppe region.

[0095] The target distance can be the distance between the center points of adjacent wooden stakes.

[0096] In some alternative implementations, wooden stakes can be driven into the sandy soil where plant seeds have been mixed, using a hand hammer or piling machinery at the target distance.

[0097] In some alternative implementations, the sand around the wooden stake can be repeatedly tamped down by foot until it is stable, or a tamping tool can be used to compact the sand at the base of the stake.

[0098] In some alternative implementations, the target distance can be negatively correlated with wind speed, meaning that the stronger the wind, the smaller the target distance.

[0099] In some alternative implementations, dune stability is determined based on at least one of the following: Vegetation coverage, windward slope of dunes, natural angle of repose of sand in dunes, mass moisture content of dunes, average particle size of sand in dunes, and annual sand transport potential.

[0100] As an example, a preset formula can be used to determine dune stability based on at least one of the following: vegetation cover, windward slope of the dune, natural angle of repose of the sand in the dune, mass moisture content of the dune, average grain size of the sand in the dune, and annual sediment transport potential. Alternatively, a preset correspondence table can be used to find the corresponding dune stability based on at least one of the following: vegetation cover, windward slope of the dune, natural angle of repose of the sand in the dune, mass moisture content of the dune, average grain size of the sand in the dune, and annual sediment transport potential.

[0101] The second step is to lay straw mats on the sandy ground where the wooden stakes have been driven in and compacted, following the direction in which the wooden stakes are set.

[0102] The direction can be set as a linear path formed by the arrangement of wooden stakes.

[0103] In some alternative implementations, the straw mat can be laid flat along the line connecting the wooden stakes and adjusted for alignment manually; or, auxiliary tools can be used to lay the straw mat in the aforementioned sandy area in a set direction.

[0104] The third step is to use wire or rope to tie the straw mat to the wooden stakes to form a straw mat sand barrier; or, bury the edges of the straw mat to form a straw mat sand barrier.

[0105] In some alternative implementations, sandbags or clods of soil can be used to bury the edges of the straw mat.

[0106] In some alternative implementations, the straw mat can be secured to the stakes using wire or rope, or the edges of the straw mat can be buried for reinforcement.

[0107] Optionally, after the straw curtain sand barrier is laid, it can be inspected regularly (especially after severe weather such as strong winds and heavy rain) to repair damage, straighten wooden stakes, and clean debris from the curtain in a timely manner to ensure the sand barrier is effective for a long time.

[0108] It is understandable that determining the target distance based on the wind force and sand dune stability of the alpine desert steppe region, and then driving in wooden stakes for compaction, laying straw mats along the direction of the stakes, and using wire / rope binding or edge burying for double fixation, makes the construction process of the straw mat sand barrier more suitable for the characteristics of the alpine desert steppe region environment. This can improve the structural stability and wind erosion resistance of the sand barrier, reduce the erosion of mixed plant seeds by surface wind and sand activities, and thus further improve the restoration efficiency of sandy vegetation in alpine desert steppe regions where photovoltaic power stations are located.

[0109] It should be noted that, where there is no conflict, the technical features described in different alternative implementations can be included in the same embodiment. For the sake of brevity, they will not be elaborated here.

[0110] Based on the embodiments of this disclosure, by adding soil conditioner to the sandy land in the alpine desert steppe area where photovoltaic power stations are located, favorable soil conditions are created for subsequent plant growth. By sowing plant seeds in the sandy land with added soil conditioner, a composite vegetation system is formed. By laying straw mats and sand barriers on the sandy land with sown plant seeds, surface wind and sand activity can be effectively reduced, protecting plant seeds and seedlings and creating a more stable environment for natural vegetation restoration. Irrigation of the sandy land with straw mats and sand barriers ensures the water conditions required for seed germination and seedling growth, accelerating the vegetation restoration process. Therefore, by comprehensively considering the climate, vegetation, and soil characteristics of the alpine desert steppe area, as well as the local wind and sand activity patterns of the photovoltaic power station area, the limitations of single measures in promoting rapid vegetation restoration at power stations are overcome. This combination of multiple measures improves the vegetation restoration efficiency of sandy land in alpine desert steppe areas where photovoltaic power stations are located.

[0111] Figure 2 This is a flowchart illustrating another method for restoring vegetation in sandy areas according to an exemplary embodiment of this disclosure. Figure 2 As shown, the method specifically includes: Step 201: Add soil conditioner to the sandy land in the alpine desert grassland area where photovoltaic power stations are located.

[0112] In this embodiment, step 201 and Figure 1 Step 101 in the corresponding embodiment is basically the same, and will not be repeated here.

[0113] Step 202: Sow plant seeds in the sandy soil where soil conditioner has been added.

[0114] In this embodiment, step 202 and Figure 1 Step 102 in the corresponding embodiment is basically the same, and will not be repeated here.

[0115] Step 203: Lay straw mats and sand barriers on the sandy ground where plant seeds have been mixed.

[0116] In this embodiment, step 203 and Figure 1 Step 103 in the corresponding embodiment is basically the same, and will not be repeated here.

[0117] Step 204: Perform the first irrigation on the sandy land that has been covered with straw mats and sand barriers, so that the depth of the sandy land after the first irrigation is greater than or equal to 5 cm.

[0118] In this embodiment, the first irrigation can be the first water replenishment operation carried out after the straw curtain and sand barrier are laid.

[0119] The wetting depth can be the depth to which water penetrates vertically into the sand after the first irrigation.

[0120] In some alternative implementations, the area covered by the straw mat sand barrier can be evenly sprayed with a watering can after 16:00; or, a mobile sprinkler irrigation system can be activated after 16:00 for targeted irrigation. Irrigation should continue until the sand is wetted to a depth of 5 cm or more.

[0121] In some alternative implementations, to ensure that the sand is thoroughly irrigated during the first irrigation, it needs to be moistened to about 5 centimeters, and irrigation can be carried out after 16:00.

[0122] Step 205: Within the preset time frame from the first irrigation to the time frame after the first irrigation, water the sandy land a preset number of times per week.

[0123] In this embodiment, the preset duration can be the maintenance cycle from the first irrigation to the establishment of vegetation. As an example, the preset duration can be half a month to one month.

[0124] In some alternative implementations, after the initial irrigation, the sandy surface can be atomized with a handheld sprinkler after 16:00, or intermittent irrigation can be carried out using drip irrigation tape.

[0125] In some alternative implementations, after the initial watering (irrigation), watering can be done twice a week (except on rainy days), keeping the seedbed moist during this period. The watering cycle can be adjusted based on the overall germination progress.

[0126] It should be noted that, in addition to the contents described above, this embodiment may also include... Figure 1 The corresponding technical features described in the corresponding embodiments, thereby achieving Figure 1 For details on the technical effects of the shown sandy vegetation restoration methods, please refer to [link / reference needed]. Figure 1 The relevant descriptions are presented concisely and will not be elaborated upon here.

[0127] Based on the embodiments disclosed herein, an irrigation strategy matching the climatic characteristics (large diurnal temperature range and strong evaporation) of the alpine desert steppe region is constructed, including the initial irrigation time (after 16:00), watering depth (≥5 cm), subsequent irrigation frequency (twice a week), timing (after 16:00 on non-rainy days), and duration (preset duration). Irrigating after 16:00 reduces water loss through evaporation; the initial irrigation ensures a watering depth of ≥5 cm, providing sufficient moisture for seed germination; subsequent irrigation is dynamically adjusted based on weather conditions to maintain suitable humidity in the seedbed while avoiding excessive watering that could lead to seed rot. This can further improve the restoration efficiency of sandy vegetation in alpine desert steppe regions equipped with photovoltaic power stations.

[0128] The following describes the embodiments of this disclosure by way of example. However, it should be noted that the following content is only used to understand the technical solutions of the embodiments of this disclosure and does not constitute a limitation on the protection scope of the embodiments of this disclosure.

[0129] The Qinghai-Tibet Plateau's high-altitude, cold desert grassland region is rich in natural resources such as land and solar energy, possessing unique advantages for photovoltaic development and serving as an important planning and construction area for new energy bases in my country. However, this region suffers from scarce water resources, arid and infertile soil, frequent wind and sandstorms, and a weak ecosystem with limited resilience. Natural restoration after localized surface damage from photovoltaic power station construction is challenging. Furthermore, the localized funneling effect of photovoltaic power stations triggers secondary wind and sand disasters. Frequent surface wind and sand activity restricts the natural vegetation restoration process, while also threatening the safe operation of power stations and reducing the efficiency of photovoltaic power generation. Therefore, artificial intervention to restore vegetation in the sandy areas surrounding photovoltaic power stations is urgently needed to achieve rapid restoration of vegetation in the short term.

[0130] Currently, the technology for rapid vegetation restoration in sandy areas near photovoltaic power stations in this region is still imperfect, lacking comprehensive consideration of local climate, vegetation, soil characteristics, and the patterns of wind and sand activity in the power station area. Existing single measures such as mechanical sand barriers, vegetation measures, and chemical sand fixation have limited effectiveness in promoting rapid vegetation restoration at power stations, and the integrated application of multiple measures is still insufficient, making it difficult to achieve coordinated development between photovoltaic power generation systems and the ecological environment.

[0131] Overall, this plan, by first adding soil conditioner to the sandy land, then selecting appropriate plant combinations for mixed sowing and laying straw mats and sand barriers, and finally carrying out regular irrigation and maintenance, can promote the restoration of vegetation in the photovoltaic power station in a short period of time and achieve the coordinated development of the photovoltaic power generation system and the ecological environment.

[0132] Specifically, such as Figure 3 As shown, the present invention provides a method for restoring vegetation in sandy areas, comprising the following steps: Step 301, Material and Equipment Preparation.

[0133] Material and equipment preparation: Material preparation includes straw mats and sand barriers, soil amendment materials, grass seeds and crop seeds, rotary tillers, shovels, etc.

[0134] The straw mat (straw mat) sand barrier material is made of fresh, mold-free, disease-free wheat straw, rice straw, reeds and other straws. The breaking strength of a single straw must reach or exceed 15N (Newton) to ensure structural stability. The straw mat (straw mat) is processed by a special straw mat machine and is prepared in bundles or rolls for use. The moisture content of the straw should be controlled between 15% and 20%. If the moisture content is insufficient, it can be soaked in water for about 2 hours to achieve the appropriate flexibility.

[0135] Soil conditioners include sand-fixing and water-retaining materials, base fertilizer, and chemical fertilizer. The sand-fixing and water-retaining material uses Artemisia argyi gum with a purity of ≥99.9%. A 1% (by mass) solution of Artemisia argyi gum has a viscosity of 900 Pa·s (Pa·s), and its water absorption capacity can reach dozens of times its own weight. It is insoluble in water. The liquid Artemisia argyi seed gum is concentrated and dried to make a powdered gum. After being diluted with water and swollen, it forms a reversible gel with good dispersibility, stability, and strong adhesion. The peeled-off gel film has a certain degree of elasticity and toughness. Well-rotted cow and sheep manure should be used as base fertilizer. The manure must be fully decomposed to meet harmless standards. According to current industry standards, well-rotted manure must meet the following requirements: moisture content ≤30%, roundworm egg mortality rate ≥95%, coliform count ≤10⁻¹, and no obvious pathogens, insect eggs, or weed seeds remaining after harmless treatment. The material should be dark brown, odorless with a clean earthy aroma, and loose in texture, clumping easily when squeezed but crumbling upon light touch. Qualified commercial urea should be selected, meeting the relevant standards for qualified agricultural fertilizers.

[0136] Grass seeds selected include crested wheatgrass, Kentucky bluegrass, fescue, Qinghai sand-fixing grass, and oats, etc., with a seed grade of Grade 1, meeting the quality standards stipulated by current national standards. Barley seeds are classified as conventional field crops, meeting the quality standards stipulated by current national standards.

[0137] The equipment mainly includes a rotary tiller and a shovel. The rotary tiller is a small agricultural model with a tilling depth of 20 cm. The shovel is a self-made straight-plate shovel, consisting of a head, handle, and grip. The head is made of a steel plate 25 cm wide × 40 cm long × 0.2 cm thick; the handle is made of a steel pipe 1.05 m long, 3 cm outer diameter, and 0.2 cm thick; and the grip is made of a steel pipe 20 cm long, 3 cm outer diameter, and 0.2 cm thick. The head, handle, and grip are welded together to form the shovel. The weld between the head and handle is 5 cm long, along the middle of the head. The handle is welded to the middle of the grip, ensuring a strong weld and smooth edges for safe use.

[0138] Step 302, land preparation and soil improvement.

[0139] Choose a sunny, windless day in April or May before or after rain. Use manual or mechanical methods to evenly spread 1500-2000 kg of prepared cow and sheep manure base fertilizer, 30-35 kg of urea, and 10-12 kg of Artemisia argyi gum per acre on the soil surface. Use a rotary tiller to loosen the top 20 cm and apply the manure, nitrogen fertilizer, and Artemisia argyi gum into the soil to construct a composite improvement layer composed of Artemisia argyi gum, organic fertilizer, and chemical fertilizer. This artificial soil layer has the functions of water retention and seepage prevention, slow release of nutrients, and initial consolidation of the sand surface, creating good soil physical and chemical conditions for high survival rates of sand-fixing grass seeds and crop seeds.

[0140] Step 303: Select plant combinations for mixed sowing.

[0141] After land preparation and soil improvement are completed, sowing is carried out using a seeder. The sowing density is controlled according to the ratio of target species to associated species = 8:2, with a total sowing amount of 22 kg per hectare. The target species, *Leymus chinensis*, *Poa chinensis*, *Festuca aquifolioides*, and *Hemiberlesia asiatica*, are mixed and sown in a 1:1:1:1 ratio. The sowing amounts for the four grass species are 7.5 kg, 3.75 kg, 3.75 kg, and 3.75 kg respectively, which, after a 0.8 ratio adjustment, results in a total sowing amount of 15 kg. The associated species, oats and barley, are mixed and sown in a 1:1 ratio. The sowing amounts for both oats and barley are 15 kg each, which, after a 0.2 ratio adjustment, results in a total sowing amount of 6 kg. Oats and barley are annual herbaceous plants or crops, whose main functions are to increase soil organic matter and provide wind and sun protection for pasture seedlings.

[0142] Specifically, the detailed process for calculating the sowing amount is as follows: Calculation method for mixed sowing amount: According to relevant regulations, the sowing amount per hectare is 30 kg of crested wheatgrass, 15 kg of fescue, 15 kg of Kentucky bluegrass, 15 kg of Qinghai sand-fixing grass, 30 kg of oats, and 30 kg of highland barley. When various grass species in the Poaceae family are mixed, the mixing ratio is *Leymus chinensis*: *Festuca foetida*: *Poa annua*: *Hemiberlesia lingua* = 1:1:1:1. Therefore, the total weight of the Poaceae seeds is 0.25 × (Leymus chinensis seeding + *Festuca foetida* seeding + *Poa annua* seeding + *Hemiberlesia lingua* seeding) = 0.25 × (30 + 15 + 15 + 15) = 18.75. The seeding amounts for each Poaceae species are as follows: *Leymus chinensis* seeding is 0.25 × 30 kg, or 7.5 kg; *Festuca foetida* seeding is 0.25 × 15 kg, or 3.75 kg; *Poa annua* seeding is 0.25 × 15 kg, or 3.75 kg; and *Hemiberlesia lingua* seeding is 0.25 × 15 kg, or 3.75 kg. When oats and barley are mixed in a 1:1 ratio, the sowing rate is calculated as follows: Oat sowing rate = 0.50 × (Oat sowing rate + Barley sowing rate) = 0.50 × (30 + 30) = 30. The sowing rates for oats and barley are: Oat sowing rate: 0.5 × 30 kg (15 kg); Barley sowing rate: 0.5 × 30 kg (15 kg). The target species are *Leymus chinensis*, *Festuca alopecuroides*, *Poa annua*, and *Hemiberlesia asiatica*, with oats and barley as companion species. Based on an 8:2 ratio of target species to associated species, the following seeding rates are calculated: Target species seeding rate = 0.8 × Gramineae seeding rate = 0.8 × 18.75 = 15 kg. The seeding rates for each Gramineae species are as follows: *Leymus chinensis* seeding rate: 0.8 × 7.5 kg, or 6 kg; *Festuca aquifolioides* seeding rate: 0.8 × 3.75 kg, or 3 kg; *Poa annua* seeding rate: 0.8 × 3.75 kg, or 3 kg; *Hemiberlesia asiatica* seeding rate: 0.8 × 3.75 kg, or 3 kg. Associated species seeding rate = 0.2 × (oat seeding rate + barley seeding rate) = 0.2 × (15 + 15) = 6 kg. The seeding rates for oats and barley are as follows: Oats seeding rate: 0.2 × 15 kg, or 3 kg; Barley seeding rate: 0.2 × 15 kg, or 3 kg. The final total seeding rate for both target and associated species is 22 kg per hectare.

[0143] Step 304: Laying straw curtains and sand barriers.

[0144] Lay straw mats in mixed planting areas. The specifications of the straw mats can be set according to the spacing of the photovoltaic array, with a width of 1-2 meters, a length of 6-15 meters, and a thickness of 2-3 centimeters. The amount used per acre is approximately 800-1000 square meters. Drive wooden stakes into the sand at the designed spacing (i.e., the target distance) and tamp them down. The spacing of the wooden stakes can be adjusted according to wind force and sand dune stability; the spacing should be reduced in strong winds. Lay the straw mats on the sand surface along the direction of the wooden stakes, ensuring they are tightly connected. The straw mats can be tied to the wooden stakes with wire or rope, or the edges of the straw mats can be buried for reinforcement. After the straw mat sand barrier is laid, it should be inspected regularly (especially after severe weather such as strong winds and heavy rains), and any damage should be repaired promptly, the wooden stakes straightened, and debris removed from the mats to ensure the sand barrier's long-term effectiveness.

[0145] Here, in some optional implementations, the dune stability α2 can be determined by combining four factors: vegetation cover, dune morphology, sand material erosibility, and wind erosion dynamics, taking a value between 0 and 1, with higher values ​​indicating greater stability. For example, the following formula (8) can be used to calculate the dune stability α2: α2 = w1 × V + w2 × S p +w3×G s +w4×W r (8) In formula (8), V represents the measured vegetation coverage (e.g., vegetation coverage percentage, with a value of 0-1), w1 represents the weight corresponding to V, for example, 0.4; S p S represents the dune morphology factor (its value ranges from 0 to 1). p =1-φ2 / α3; φ2 is the windward slope of the dune; α3 is the natural angle of repose of the sand; w2 represents S p The corresponding weight, for example, 0.25; G s G is the erosibility factor of sandy materials. s =0.6G d +0.4G w G d G is the particle size erodibility factor. w w3 represents the moisture content stability factor, where w3 represents G. s The corresponding weight, for example, 0.2; W r W represents wind erosion dynamics. r =1-DP / DP max DP represents annual sediment transport potential. max Indicates the maximum possible sand transport potential, w4 represents W r The corresponding weight, for example, 0.15.

[0146] Among them, the particle size erodibility factor G d It can be determined in the following ways: When d is less than 0.1 mm, G d The value is 0.2; When d is greater than or equal to 0.1 mm and less than 0.25 mm, G d The value ranges from 0.3 to 0.4; When d is greater than or equal to 0.25 mm and less than 0.5 mm, G d The value ranges from 0.5 to 0.6; When d is greater than or equal to 0.5 mm and less than 1 mm, G d The value ranges from 0.7 to 0.8; When d is greater than or equal to 1 mm, G d The value ranges from 0.9 to 1; d represents the average particle size of the sand.

[0147] Moisture content stability factor G w It can be determined in the following ways: , w represents the moisture content by mass.

[0148] In some cases, α2 ≥ 0.8 indicates a fixed dune (stable); 0.5 ≤ α2 < 0.8 indicates a semi-fixed dune (semi-stable); and α2 < 0.5 indicates a mobile dune (unstable).

[0149] Furthermore, the spacing D2 between the wooden stakes, in meters (m), can be determined using the following formula (9): Based on wind speed and dune stability α2, the formula is as follows: D2 = H2 × α2 × (V0 / V c )×C(9) In formula (9), H2 represents the exposed height of the wooden stake, in meters (m); α2 represents the dune stability; V0 represents the starting wind speed; V C The value C represents the measured wind speed; C represents the safety factor, for example, 8-15.

[0150] Step 305: Regular irrigation and maintenance.

[0151] After the experiment, water thoroughly the seedbed. The first watering should be enough to wet the seedbed to about 5cm. Water twice a week (if it is cloudy or rainy, do not water). Keep the seedbed moist during this period. Adjust the watering cycle according to the overall germination. The watering period is about half a month to a month. Water after 16:00.

[0152] It should be noted that, in addition to the contents described above, this embodiment may also include the technical features described in the above embodiments, thereby achieving the technical effect of the above-described method for restoring vegetation in sandy areas. For details, please refer to the above description. For the sake of brevity, it will not be elaborated here.

[0153] Based on the embodiments disclosed herein, by first adding a soil conditioner to the sandy land, then selecting appropriate plant combinations for mixed sowing and laying straw mat sand barriers, and finally carrying out regular irrigation and maintenance, vegetation restoration in the sandy land can be achieved in a short period of time, realizing the coordinated development of the photovoltaic power generation system and the ecological environment. Experiments show that after adopting this scheme, seeds germinated in 7 days, vegetation coverage reached 20% after 4 months, and sand transport decreased by 90%. This not only ensured the safe operation of the photovoltaic power station but also improved the overall ecological environment quality, achieving the coordinated development of the photovoltaic power generation system and the ecological environment.

[0154] The above description is merely a specific embodiment of this disclosure, enabling those skilled in the art to understand or implement it. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of this disclosure. Therefore, this disclosure is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A method for restoring vegetation in sandy areas, characterized in that, The method includes: Add soil conditioner to sandy land in high-altitude desert grassland areas where photovoltaic power stations are located; Plant seeds were mixed and sown in the sandy land where soil conditioner had been added; Lay straw mats as sand barriers on the sandy ground where plant seeds have been mixed. Irrigate the sandy land where straw mats and sand barriers have been laid.

2. The method according to claim 1, characterized in that, The soil conditioner includes one or more of the following: sand-fixing and water-retaining materials, base fertilizer, and chemical fertilizer.

3. The method according to claim 2, characterized in that, The sand-fixing and water-retaining material is Artemisia argyi, the purity of which is greater than or equal to 99.9%, and the viscosity of a 1% (by mass) solution prepared from Artemisia argyi is greater than or equal to 900 Pa·s; the base fertilizer is well-rotted cow and sheep manure, the moisture content of which is less than or equal to 30%, the mortality rate of Ascaris eggs in which which is well-rotted is greater than or equal to 95%, the which has undergone harmless treatment, and the ratio of the number of viable Escherichia coli after harmless treatment to the number of viable Escherichia coli before harmless treatment is less than or equal to one-tenth; the chemical fertilizer is urea.

4. The method according to claim 2, characterized in that, The amount of soil conditioner added per acre of sandy land is 1500-2000 kg of cow and sheep manure, 30-35 kg of urea, and 10-12 kg of Artemisia argyi gum.

5. The method according to claim 1, characterized in that, The plant seeds include a target species and an associated species; wherein the ratio of the target species to the associated species is 8:

2.

6. The method according to claim 5, characterized in that, The target species include crested wheatgrass, Kentucky bluegrass, fescue, and Qinghai sand-fixing grass. The sowing rate of crested wheatgrass is 7-8 kg / ha, the sowing rate of Kentucky bluegrass is 3-4 kg / ha, the sowing rate of fescue is 3-4 kg / ha, and the sowing rate of Qinghai sand-fixing grass is 3-4 kg / ha. The associated species include oats and highland barley. The sowing rate of oats is 2.8-3.2 kg / ha, and the sowing rate of highland barley is 2.8-3.2 kg / ha.

7. The method according to claim 1, characterized in that, The straw curtain sand barrier is made of at least one type of straw selected from wheat straw, rice straw, and reeds. The breaking strength of a single straw is greater than or equal to 15 Newtons, and the moisture content of the straw is 15%-20%. The width of the straw curtain sand barrier is 1-2 meters, the length of the straw curtain sand barrier is 6-15 meters, the thickness of the straw curtain sand barrier is 2-3 centimeters, and the usable area of ​​the straw curtain sand barrier in each acre of sandy land is 800-1000 square meters.

8. The method according to claim 7, characterized in that, The process of laying straw mats and sand barriers on the sandy ground where plant seeds have been mixed includes: Wooden stakes are driven into the sandy land where the mixed plant seeds have been sown at a target distance and compacted, wherein the target distance is determined based on the wind force and dune stability of the alpine desert steppe region; Along the direction in which the wooden stakes are set, the straw mat is laid on the sandy ground where the wooden stakes have been driven in and compacted; The straw curtain is tied to the wooden stake using wire or rope to form a straw curtain sand barrier; or the edges of the straw curtain are buried to form a straw curtain sand barrier.

9. The method according to claim 8, characterized in that, The dune stability is determined based on at least one of the following: Vegetation coverage, windward slope of dunes, natural angle of repose of sand in dunes, mass moisture content of dunes, average particle size of sand in dunes, and annual sand transport potential.

10. The method according to any one of claims 1-9, characterized in that, The irrigation of the sandy land where straw mats and sand barriers have been laid includes: The sandy land that has been covered with straw mats and sand barriers shall be irrigated for the first time, so that the water depth of the sandy land after the first irrigation is greater than or equal to 5 cm. Within a preset timeframe from the first irrigation to the period following the first irrigation, the sandy land is watered a preset number of times per week.

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