A sand-fixing method for fish-scale sand barriers of flowing dunes

Abstract

This invention belongs to the field of sand barrier stabilization technology, specifically relating to a method for stabilizing shifting sand dunes using a fish-scale-shaped sand barrier. In this method, the edge of the fish-scale-shaped sand barrier is formed by straight grooves connecting end to end, creating a closed shape. Multiple arc-shaped grooves are arranged inside, with adjacent rows of arc-shaped grooves staggered and evenly spaced. The span of each arc-shaped groove is 4m~4.5m, and its sag is 1.5m~2m. The tangent of the highest point of the curved edge of the arc-shaped groove is perpendicular to the prevailing wind direction. Straw is pressed into the arc-shaped grooves. Vegetation is planted in the areas of the fish-scale-shaped sand barrier where no straw is laid. This fish-scale-shaped sand barrier can reduce wind erosion to 22.4g / m². 2 •d, the vegetation emergence rate is increased to over 20.5%. The sand-fixing method of the fish-scale sand barrier of this invention reduces wind speed by ≥38%, reduces sand transport by ≥60%, and increases vegetation coverage by ≥40% within 3 years.

Description

Technical Field

[0001] This invention belongs to the field of sand barrier stabilization technology, specifically relating to a method for stabilizing sand dunes using fish-scale-shaped sand barriers. Background Technology

[0002] Mobile sand dunes are one of the most severe forms of desertification, mainly formed by wind transport and deposition. They are characterized by high mobility, poor nutrient content, and poor water retention. The vegetation cover of mobile sand dunes is extremely low, typically less than 5%, and the soil organic matter content is less than 0.1%, making plant growth impossible.

[0003] Existing sand barrier technologies mostly use straight-line straw grids, nylon netting, and PLA sandbags, which have the following problems: limited effectiveness in preventing wind erosion and fixing sand, with wind speed reduction rates generally below 30%; and low vegetation restoration rates, with coverage increasing by less than 20% within 3 years. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for stabilizing sand dunes using fish-scale-shaped sand barriers.

[0005] The first objective of this invention is to provide a method for stabilizing sand dunes using fish-scale-shaped sand barriers, comprising the following steps: The area where fish-scale sand barriers are set up: The edge of the area of ​​the fish-scale sand barriers is formed by straight grooves connecting end to end to form a closed shape. Multiple arc-shaped grooves are set inside the area of ​​the fish-scale sand barriers, with adjacent rows of arc-shaped grooves arranged in a staggered and uniform manner. The span L of each arc-shaped groove is 4m~4.5m, and the sag H of each arc-shaped groove is 1.5m~2m. The span refers to the length of the straight segment connecting the two endpoints of the arc-shaped groove, and the sag refers to the perpendicular distance between the highest point of the arc and the line connecting the two ends of the arc-shaped groove. The staggered and uniform arrangement means that adjacent rows of arc-shaped grooves are set in the same direction, and the two endpoints of the arc-shaped grooves in the next row are respectively set at the highest point of the curved edge of the two adjacent arc-shaped grooves in the previous row, i.e., the midpoint of the curved edge. The external tangent of the highest point of the curved edge of the arc-shaped groove is perpendicular to the prevailing wind direction.

[0006] Laying straw: Press the straw into the circular groove, with the straw protruding 15cm to 20cm above the ground surface.

[0007] Planting vegetation: Plant vegetation in the areas of the fish-scale sand barrier where no straw has been laid.

[0008] Preferably, the span of the arc groove is 4.25m and the sag of the arc groove is 1.75m.

[0009] Preferably, the straight grooves and circular grooves are both 15cm~20cm deep and 20cm~25cm wide.

[0010] Preferably, the straight groove and the arc groove are both 17cm deep and 22cm wide.

[0011] Preferably, the method for laying straw includes the following steps: Lay the straw horizontally across the trench, ensuring both ends are evenly distributed. Press the straw into the trench from the middle, leaving 10-15cm of the straw protruding above the ground. Straighten the protruding ends of the straw so they are perpendicular to the ground. Then, use a shovel to gather the sand from both sides of the straw to the base in the middle, making the base more stable. Straightening the straw makes the sand barrier more stable in the early stages of sand compaction. If the straw is not straightened and sand is filled directly in the middle for fixation, the sand will flow out from the gaps in the sand barrier, failing to provide fixation and increasing the probability of the sand barrier being blown away by strong winds. The sand layer from the top of the straw to the point where the straw contacts the ground should be 3-5cm higher than the ground level to prevent wind damage. Top sand covering involves covering the middle of the straw with another layer of sand after it has been pressed into the sand, the purpose of which is to further reinforce the sand barrier and prevent it from being damaged by wind.

[0012] Preferably, the sand layer is 4 cm above the ground.

[0013] Preferably, the vegetation consists of psammophytic plants belonging to the genera *Artemisia* (Asteraceae), *Agonium* (Chenpodiaceae), and *Achnatherum* (Poaceae). These psammophytic plants are native species of the Dengmaying Lake Eighty-Mile Sandbar in Liangzhou District, on the southeastern edge of the Tengger Desert. They are cold-resistant, drought-resistant, and tolerant of poor soil, resistant to wind erosion and sand burial, and suitable for various locations. Furthermore, by combining shrubs and grasses, sand rice quickly covers the ground, *Artemisia* roots deeply stabilize the sand, and the sand whip network is stable, which can form a succession sequence of "pioneer, community, and stability" in the later stages.

[0014] Preferably, the psammophytic plants of the genus *Chenami* (family Chenopodiaceae) are *Salvia splendens*, those of the genus *Artemisia* (family Asteraceae) are *Artemisia argyi*, and those of the genus *Achnatherum* (family Poaceae) are *Salvia splendens*. *Salvia splendens* is a pioneer sand-fixing species, extremely drought-tolerant. Its seeds maintain a germination rate of over 60% even under 0.5% NaCl stress. *Salvia splendens* is an annual herb, forming a cover in the same year it is sown; moderate sand burial promotes germination. It can withstand wind erosion and sand cutting on shifting dunes. *Artemisia argyi* is a community-building shrub species with strong resistance, drought tolerance, cold tolerance, and tolerance to poor soil conditions. It is resistant to wind erosion and sand burial, has a well-developed root system with a taproot reaching 3-5 meters deep and dense lateral roots, resulting in strong sand-fixing ability. The decomposition of fallen leaves of *Artemisia argyi* increases organic matter in sandy areas and improves soil structure. *Artemisia argyi* has a long lifespan, being a perennial shrub, providing long-term benefits from a single planting. *Salvia splendens* is a rhizomatous sand-fixing species with strong rhizome reproductive capacity; its rhizomes spread crisscrossingly in the sand, forming a network-like sand-fixing system. Sand sedge is tolerant of sand burial; sand burial stimulates the sprouting of adventitious roots and buds at the rhizome nodes, resulting in vigorous growth with increasing burial density. It exhibits outstanding resilience, being cold-hardy, drought-tolerant, and wind-erosion resistant, and retains its sand-fixing function even after withering in winter. Ecological stability: As a perennial grass, once a community is established, it is not easily degenerated. Sand sedge and Artemisia form a succession sequence, and their rhizome networks effectively prevent dune movement, making them suitable as successor species for long-term sand fixation.

[0015] Preferably, the planting method of Artemisia arenaria, Artemisia argyi, and Artemisia argyi includes the following steps: mixing the seeds of Artemisia arenaria, Artemisia argyi, and Artemisia argyi at a mass ratio of 0.8~1:0.8~1:0.8~1, and then adding 3g / m 2 ~4g / m 2 The density of the seeding.

[0016] Preferably, the straw is one or both of rice straw and wheat straw.

[0017] Preferably, in front of the area where the fish-scale sand barrier is set, stones and debris with a diameter of 5 cm or more are cleared, and the sand surface is leveled so that the allowable height difference of the surface is less than or equal to 2 cm.

[0018] Compared with the prior art, the present invention has the following beneficial effects: 1. The fish-scale sand barrier of the present invention, by arranging straw in a fish-scale pattern, reduces wind speed by more than 32% and wind erosion by less than 22.4 g / m². 2 •d, the vegetation emergence rate is higher than 20.5%, greatly improving the efficiency of mobile sand dune control. The invention establishes a fish-scale sand barrier area: the edge of the fish-scale sand barrier area is formed by straight grooves connecting end to end to form a closed shape. Multiple arc-shaped grooves are set inside the fish-scale sand barrier area, with adjacent rows of arc-shaped grooves arranged in a staggered and uniform manner. The span of each arc-shaped groove is 4m~4.5m, and the sag of each arc-shaped groove is 1.5m~2m. The span refers to the length of the straight segment connecting the two endpoints of the arc-shaped groove, and the sag refers to the perpendicular distance between the highest point of the arc and the line connecting the two ends of the arc-shaped groove. The staggered and uniform arrangement means that adjacent rows of arc-shaped grooves are set in the same direction, and the two endpoints of the arc-shaped groove in the next row are respectively set at the highest point of the curved edge of the two adjacent arc-shaped grooves in the previous row, i.e., the midpoint of the curved edge. The external tangent of the highest point of the curved edge of the arc-shaped groove is perpendicular to the prevailing wind direction. Laying straw: Press the straw into the arc-shaped trenches, with the straw protruding 15cm-20cm above the ground surface. Planting vegetation: Plant vegetation in the areas of the fish-scale sand barrier where no straw has been laid. The fish-scale-shaped "arc and straight" mosaic pattern of this invention divides continuous sand dunes into several "semi-enclosed units." The straight sections, especially the windward sections, first "intercept" the near-surface airflow from 0cm to 50cm above the ground, forming a local deceleration zone. The leeward arc section is perpendicular to the prevailing wind direction, forcing the airflow to "circumvent and split" at the apex of the arc, generating reverse vortices, breaking the original "high-speed wind belt" into multiple low-speed wind belts, achieving a three-in-one effect of "wind splitting, deceleration, and sand falling." The semi-concealed structure of the straw forms a "flexible porous wall," preventing direct wind penetration and avoiding wind erosion pits, while also preventing wind from completely bypassing and accelerating. The fish-scale sand barrier can reduce wind erosion to below 22.4g / m³. 2•d, the germination rate of vegetation is higher than 20.5%. The fish-scale sand barrier of this invention is arranged perpendicular to the prevailing wind direction. The straw is porous and flexible, and the segmented wake of the fish-scale geometry simultaneously achieves wind kinetic energy reduction, sand interception, water retention, and nutrient enrichment in a four-phase coupled system of wind field, sand, water, and vegetation. Thus, at the same or even lower cost, it can achieve the dual benefits of windbreak and sand fixation and vegetation restoration.

[0019] 2. A method for stabilizing sand dunes using fish-scale-shaped sand barriers, comprising the following steps: Clearing away stones and debris with a diameter of 5 cm or more, leveling the sand surface to ensure a surface flatness difference of less than or equal to 2 cm. Digging straight trenches along the edge of the area where the fish-scale-shaped sand barriers are to be laid, and digging arc-shaped trenches adjacent to the straight trenches and perpendicular to the prevailing wind direction, the trenches are 15-20 cm deep and 20-25 cm wide. Laying straw horizontally on the trenches, ensuring both ends of the straw are evenly distributed, pressing the straw into the trench from the middle, leaving 10-15 cm of the straw ends protruding above the ground, straightening the protruding ends of the straw so that they are perpendicular to the ground, and then using a shovel to gather the sand on both sides of the straw to the base of the straw in the middle, making the base more stable. Then, aligning each row of sand barriers with the middle gap of the previous row, arranging them in a staggered, fish-scale pattern, repeating the digging of arc-shaped trenches and the placement of straw. Covering the top with 3-5 cm of sand to prevent wind damage. The sand-fixing method of the fish-scale sand barrier of the present invention for mobile sand dunes uses the geometric arrangement of straw, is simple to operate, and uses inexpensive and readily available straw materials. It is significantly superior to the prior art in terms of windbreak and sand fixation, vegetation restoration, and cost control. It is suitable for large-scale mobile sand dune management and has high promotion value.

[0020] The vegetation of this invention consists of psammophytic plants belonging to the genera *Artemisia* (Asteraceae), *Agonium* (Chenpodiaceae), and *Achnatherum* (Poaceae). These psammophytic plants are native species of the Dengmaying Lake Eighty-Mile Sandy Land in Liangzhou District, on the southeastern edge of the Tengger Desert. They are cold-resistant, drought-resistant, and tolerant of poor soil conditions, resistant to wind erosion and sand burial, and can be planted in suitable locations. Furthermore, by using a combination of shrubs and grasses, sand rice can quickly cover the land, *Artemisia* can deeply root and stabilize the sand, and the sand whip network can be stable. In the later stages, a succession sequence of "pioneer, community, and stability" can be formed.

[0021] The present invention includes three psammophytic plants: *Callotus spp.* (family Chenopodiaceae), *Artemisia argyi* (family Asteraceae), and *Achnatherum spp.* (family Poaceae). *Callotus spp.* is a pioneer sand-fixing species, extremely drought-tolerant, with a seed germination rate exceeding 60% even under 0.5% NaCl stress. It is an annual herb, forming a cover in the same year of sowing. Moderate sand burial promotes germination. It serves as a pioneer plant on shifting sand dunes, tolerating wind erosion and sand cutting. *Artemisia argyi* is a community-building shrub species, highly resilient, drought-tolerant, cold-tolerant, and tolerant of poor soil, resistant to wind erosion and sand burial, with a well-developed root system, a taproot reaching 3-5 meters deep, and dense lateral roots, exhibiting strong sand-fixing ability. The decomposition of fallen leaves of *Artemisia argyi* increases organic matter in sandy areas, improving soil structure. *Artemisia argyi* has a long lifespan, being a perennial shrub, providing long-term benefits from a single planting. *Achnatherum spp.* is a rhizomatous sand-fixing species with strong rhizome reproductive capacity; its rhizomes spread crisscrossingly in the sand, forming a network-like sand-fixing system. Sand sedge is tolerant of sand burial; sand burial stimulates the sprouting of adventitious roots and buds at the rhizome nodes, resulting in vigorous growth with increasing burial density. It exhibits outstanding resilience, being cold-hardy, drought-tolerant, and wind-erosion resistant, and retains its sand-fixing function even after withering in winter. Ecological stability: As a perennial grass, once a community is established, it is not easily degenerated. Sand sedge and Artemisia form a succession sequence, and their rhizome networks effectively prevent dune movement, making them suitable as successor species for long-term sand fixation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the straight grooves of the fish-scale sand barrier of the present invention.

[0023] Figure 2 This is a top view schematic diagram of the fish-scale sand barrier of the present invention.

[0024] Figure 3 This is a real-world image of the fish-scale sand barrier of the present invention. Detailed Implementation

[0025] To enable those skilled in the art to better understand and implement the technical solutions of the present invention, the following detailed description, in conjunction with preferred embodiments and accompanying drawings, provides a clear and complete account of the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0026] It should be noted that all technical terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the scope of protection of this invention. Unless otherwise specified, all raw materials, reagents, instruments and equipment used in the following embodiments of this invention can be purchased from the market or prepared by existing methods.

[0027] All experiments of this invention were conducted at Dengmaying Lake, Liangzhou District, Wuwei City, Gansu Province, at the eastern end of the Tengger Desert, where the terrain slope was 18° and the wind direction was mainly northwest.

[0028] The straw used in this invention is rice straw.

[0029] The sand barrier stability rate of the present invention is calculated according to formula (1): Formula (1): ; Where D is the sand barrier stability rate, in percentage; I1 is the length of the sand barrier that is well preserved, in meters; and I2 is the total length of the sand barrier, in meters.

[0030] The wind erosion rate of the present invention is calculated according to formula (2): Formula (2): ; Where Q represents wind erosion, with units of g / m³. 2 •d. W represents the weight of the collected sand grains, in grams. A represents the inlet area of ​​the sand collector, in m². 2 t represents the observation time, expressed in days (d).

[0031] The seedling emergence rate of the vegetation in this invention is calculated according to formula (3): Formula (3): ; Example 1 A method for stabilizing shifting sand dunes using fish-scale-shaped sand barriers includes the following steps: The area where fish-scale sand barriers are set up: The edge of the area where fish-scale sand barriers are set up is closed by straight grooves connected end to end. Multiple arc-shaped grooves are set up inside the area where fish-scale sand barriers are set up, with adjacent rows of arc-shaped grooves evenly staggered. Both the straight grooves and the arc-shaped grooves are 15cm deep and 20cm wide. The span L of the arc-shaped grooves is 4m, and the sag H of the arc-shaped grooves is 1.5m. The evenly staggered arrangement means that adjacent rows of arc-shaped grooves are set in the same direction, and the two endpoints of the arc-shaped grooves in the next row are respectively set at the highest points of the curved edges of the two adjacent arc-shaped grooves in the previous row. The external tangent of the highest point of the curved edge of the arc-shaped groove is perpendicular to the prevailing wind direction. Within the area where fish-scale sand barriers are set up, stones and debris with a diameter greater than or equal to 5cm are cleared, and the sand surface is leveled to ensure a surface flatness and a height difference of less than or equal to 2cm.

[0032] Laying the straw: Lay the rice straw horizontally across the trench, ensuring both ends are evenly distributed. Press the straw into the trench from the middle, leaving 15cm of each end protruding above the ground. Straighten the straw so that the protruding ends are perpendicular to the ground. Use a shovel to gather sand from both sides of the straw to the base of the straw in the middle, making the base more stable. Cover the top of the straw with sand, extending 5cm above the ground level where the straw touches the ground, to prevent it from being blown away by the wind.

[0033] Sowing vegetation: In the areas of the fish-scale sand barrier where no straw was laid, mix the seeds of Artemisia arenaria, Artemisia arenaria, and Artemisia arenaria at a mass ratio of 1:1:1, and then sow at 4 g / m². 2 The density of the seeding.

[0034] Within the area of ​​the fish-scale sand barrier, the stability rate of the sand barrier was 89.4% after 30 days, and the wind erosion rate was 18.3 g / m². 2 ·d, the vegetation emergence rate was 27.6%.

[0035] Example 2 A method for stabilizing shifting sand dunes using fish-scale-shaped sand barriers includes the following steps: The area where fish-scale sand barriers are set up: The edge of the area where fish-scale sand barriers are set up is closed by straight trenches connected end to end. Multiple arc-shaped trenches are set up inside the area where fish-scale sand barriers are set up, with adjacent rows of arc-shaped trenches arranged in a staggered and uniform manner. Both the straight trenches and the arc-shaped trenches are 17cm deep and 22cm wide. The span L of the arc-shaped trenches is 4.25m, and the sag H of the arc-shaped trenches is 1.75m. The staggered and uniform arrangement means that adjacent rows of arc-shaped trenches are set in the same direction, and the two endpoints of the arc-shaped trenches in the next row are respectively set at the highest points of the curved edges of the two adjacent arc-shaped trenches in the previous row. The external tangent of the highest point of the curved edge of the arc-shaped trench is perpendicular to the prevailing wind direction. Within the area where fish-scale sand barriers are set up, stones and debris with a diameter greater than or equal to 5cm are cleared, and the sand surface is leveled to ensure a surface flatness and a height difference of less than or equal to 2cm.

[0036] Laying the straw: Lay the rice straw horizontally across the trench, ensuring both ends are evenly distributed. Press the straw into the trench from the middle, leaving 12.5cm of the straw exposed above the ground. Straighten the exposed ends of the straw so they are perpendicular to the ground. Use a shovel to gather sand from both sides of the straw to the base in the middle, making the base more stable. Cover the top of the straw with sand up to 4cm above the ground level to prevent it from being blown away by the wind.

[0037] Sowing vegetation: In the areas of the fish-scale sand barrier where no straw was laid, mix the seeds of Artemisia arenaria, Artemisia arenaria, and Artemisia arenaria at a mass ratio of 0.8:0.8:1, and then sow at 3g / m². 2 The density of the seeding.

[0038] Within the area of ​​the fish-scale sand barrier, the stability rate of the sand barrier was 85.4% after 30 days, and the wind erosion was 20.5 g / m². 2 ·d, the vegetation emergence rate was 24.6%.

[0039] Example 3 A method for stabilizing shifting sand dunes using fish-scale-shaped sand barriers includes the following steps: The area where fish-scale sand barriers are set up: The edge of the area where fish-scale sand barriers are set up is closed by straight grooves connected end to end. Multiple arc-shaped grooves are set up inside the area where fish-scale sand barriers are set up, with adjacent rows of arc-shaped grooves evenly staggered. Both the straight grooves and the arc-shaped grooves are 20cm deep and 25cm wide. The span L of the arc-shaped grooves is 4.5m, and the sag H of the arc-shaped grooves is 2m. The evenly staggered arrangement means that adjacent rows of arc-shaped grooves are set in the same direction, and the two endpoints of the arc-shaped grooves in the next row are respectively set at the highest points of the curved edges of the two adjacent arc-shaped grooves in the previous row. The external tangent of the highest point of the curved edge of the arc-shaped groove is perpendicular to the prevailing wind direction. Within the area where fish-scale sand barriers are set up, stones and debris with a diameter greater than or equal to 5cm are cleared, and the sand surface is leveled to ensure a surface flatness and a height difference of less than or equal to 2cm.

[0040] Laying the straw: Lay the rice straw horizontally across the trench, ensuring both ends are evenly distributed. Press the straw into the trench from the middle, leaving 10cm of each end protruding above the ground. Straighten the straw so that the protruding ends are perpendicular to the ground. Use a shovel to gather sand from both sides of the straw to the base, making the base more stable. Cover the top of the straw with sand, extending 3cm above the ground level where the straw touches the ground, to prevent it from being blown away by the wind.

[0041] Sowing vegetation: In the areas of the fish-scale sand barrier where no straw was laid, mix the seeds of Artemisia arenaria, Artemisia arenaria, and Artemisia arenaria at a mass ratio of 1:0.8:0.8, and then sow at 3.5 g / m². 2 The density of the seeding.

[0042] Within the area of ​​the fish-scale sand barrier, the stability rate of the sand barrier was 70.5% after 30 days, and the wind erosion rate was 22.4 g / m². 2 ·d, the vegetation emergence rate was 20.5%.

[0043] Comparative Example 1 A method for stabilizing sand using square sand barriers on shifting sand dunes includes the following steps: The fish-scale structure in Example 1 was adjusted to a square with a side length of 1.5m, while all other conditions remained the same as in Example 1. In the areas of the fish-scale sand barrier where no straw was laid, Artemisia arenaria, Artemisia argyi, and Artemisia scoparia were planted. Within the area of ​​the fish-scale sand barrier, wind speed decreased by 22.1%, and wind erosion was 42.7 g / m². 2 •d, vegetation emergence rate 18.2%.

[0044] Comparative Example 2 A method for stabilizing sand using square sand barriers on shifting sand dunes includes the following steps: The fish-scale structure in Example 1 was adjusted to a square with sides of 2m, while all other conditions remained the same as in Example 1. In the areas of the fish-scale sand barrier where no straw was laid, Artemisia arenaria, Artemisia argyi, and Artemisia scoparia were planted. Within the area of ​​the fish-scale sand barrier, wind speed decreased by 15.1%, and wind erosion was 48.5g / m². 2 •d, vegetation emergence rate 15.3%.

[0045] Comparative Example 3 A method for stabilizing sand using square sand barriers on shifting sand dunes includes the following steps: The fish-scale structure in Example 1 was adjusted to a square with sides of 1.5m, the straw was replaced with nylon mesh, and the slope adaptation angle was adjusted to 20°, while all other conditions remained the same as in Example 1. In the areas of the fish-scale sand barrier where no straw was laid, Artemisia arenaria, Artemisia argyi, and Artemisia scoparia were planted. Within the area of ​​the fish-scale sand barrier, wind speed decreased by 35.2%, and wind erosion was 20.7 g / m². 2 •d, the vegetation emergence rate was 22.8%, and the cost was 6.1 yuan / meter. Although the effect was similar, the cost was 5.1 times that of straw sand barriers, and it had no soil improvement effect.

[0046] A schematic diagram of the straight grooves of the fish-scale sand barrier of the present invention is shown below. Figure 1 As shown in the top view schematic diagram of the fish-scale sand barrier of the present invention, Figure 2 As shown in the image, the fish-scale sand barrier of this invention is depicted in a real-world setting. Figure 3 As shown in Table 1, the sand-fixing effects of Examples 1-3 and Comparative Examples 1-3 are as follows. The results show that the wind speed in the area formed by the fish-scale sand barriers in Examples 1-3 decreased by 32.5%-38.7%, the sand transport volume decreased by 59.8%-62.4%, and the 3-year vegetation coverage rate decreased by 35.2%-41.9%. Compared with Comparative Example 1, Example 1 has a different shape of sand-fixing barrier, and the wind speed reduction rate of Example 1 increased from 22.1% in Comparative Example 1 to 38.7%, an increase of 75%. Correspondingly, compared with Comparative Example 1, Example 1 reduced the sand transport volume by 81% and increased the 3-year vegetation coverage rate by 113%. Therefore, the fish-scale sand barrier of the present invention for mobile dunes has a significant sand-fixing effect.

[0047] Table 1. Sand fixation effects of Examples 1-3 and Comparative Examples 1-3 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 in this invention to avoid redundancy. Although preferred embodiments of this invention have been described, those skilled in the art, once they understand the inventive concept of this invention, can make other changes and modifications to these embodiments, and all such changes and modifications fall within the scope of this invention.

[0048] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. If such modifications and variations fall within the scope of equivalents of this invention, then this invention is also intended to include such modifications and variations.

Claims

1. A method for stabilizing sand dunes using fish-scale-shaped sand barriers, characterized in that, include: The area where fish-scale sand barriers are set up: The edge of the area where the fish-scale sand barriers are set up is formed by straight grooves connecting end to end to form a closed shape; The area within the fish-scale-shaped sand barrier is equipped with multiple arc-shaped grooves, arranged in a staggered and uniform manner between adjacent rows. The arc-shaped grooves have a span of 4m to 4.5m and a rise of 1.5m to 2m. The staggered and uniform arrangement means that adjacent rows of arc-shaped grooves are arranged in the same direction, and the two endpoints of the next row of arc-shaped grooves are respectively located at the highest points of the curved edges of the two adjacent arc-shaped grooves in the previous row. The external tangent of the highest point of the curved edge of the arc-shaped groove is perpendicular to the prevailing wind direction. Laying straw: Press the straw into the circular groove, with the straw protruding 15cm to 20cm above the ground surface; Planting vegetation: Plant vegetation in the areas of the fish-scale sand barrier where no straw has been laid.

2. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 1, characterized in that, The arc groove has a span of 4.25m and a sag of 1.75m.

3. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 1, characterized in that, The specifications for both straight and circular grooves are 15cm-20cm deep and 20cm-25cm wide.

4. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 1, characterized in that, The method for laying straw includes the following steps: Lay the straw horizontally across the trench, ensuring both ends are evenly distributed. Press the straw into the trench from the middle, leaving 10-15cm of the straw exposed above the ground. Straighten the exposed ends of the straw so they are perpendicular to the ground. Use a shovel to gather sand from both sides of the straw to the base in the middle, making the base more stable. Cover the top of the straw with sand, ensuring the sand layer is 3-5cm higher than the ground level where the straw touches the ground, to prevent it from being blown away by the wind.

5. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 4, characterized in that, The vegetation is at least one of the following psammophytic plants: Artemisia genus of the Asteraceae family, Chenopodiaceae family, and Reed genus of the Poaceae family.

6. The method for stabilizing sand dunes using fish-scale sand barriers according to claim 5, characterized in that, The psammophytic plants of the Artemisia genus in the Asteraceae family are Artemisia argyi, the psammophytic plants of the Chenopodiaceae family are Artemisia argyi, and the psammophytic plants of the Poaceae family are Artemisia argyi.

7. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 6, characterized in that, The method for cultivating Artemisia arenaria, Artemisia argyi, and Artemisia argyi includes the following steps: mixing the seeds of Artemisia arenaria, Artemisia argyi, and Artemisia argyi at a mass ratio of 0.8~1:0.8~1:0.8~1, and then adding 3g / m³ of water. 2 ~4g / m 2 The density of the seeding.

8. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 4, characterized in that, The straw is one or both of rice straw or wheat straw.

9. The method for stabilizing sand dunes using fish-scale-shaped sand barriers according to claim 4, characterized in that, Before setting up the fish-scale sand barrier, clear away stones and debris with a diameter of 5 cm or more, level the sand surface, and ensure that the surface flatness has an allowable height difference of less than or equal to 2 cm.

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