A method for reconstructing a plant community for soil and water conservation on a slope

Abstract

The application discloses a kind of slope water and soil conservation plant community reconstruction methods comprising the following steps: step (1), in spring or autumn, using spray seeding method to spray seeding material with herbaceous plant seed on slope surface;Step (2), after spray seeding, laying protective net, and forming pre-protective slope surface on slope surface after maintenance management;Step (3), spray seeding in spring forms substrate soil layer by pressing down the above-ground part of herbaceous plant on pre-protective slope surface and filling and covering substrate soil in autumn of the same year or in spring of next year;Step (4), secondary slope protection seeding is carried out on substrate soil layer, and protective net is laid after seeding is completed, and water and soil conservation plant community is formed on slope surface after maintenance management.The application can solve the problem of poor stability or annual decline of water and soil conservation plant community on steep slope surface with slope greater than 65 degrees during reconstruction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plant community reconstruction. Specifically, it is a slope water and soil conservation plant community reconstruction method. BACKGROUND

[0002] In the process of urbanization construction such as traffic and municipal, a large number of slopes are often generated. These slopes often have the characteristics of high gravel content, bare surface, and soft soil, which not only destroys the original ecological environment, but also easily causes road soil erosion. Therefore, it is necessary to reconstruct the plant community on the slope.

[0003] Patent CN111887107A discloses a dry area inlaid plant community configuration model and slope protection vegetation planting method. The model and method can effectively improve the slope vegetation preservation rate, vegetation coverage and total biomass at the end of the growing season by selecting specific slope species and reasonably matching multiple species, and form a stable inlaid vegetation structure of native shrubs and herbaceous plants on the slope. However, the patent is mainly suitable for slope reconstruction with a slope of less than 50 degrees.

[0004] The main problems of plant community reconstruction on steep slopes with a slope of more than 65 degrees are as follows: when rainwater flows through the slope, there is not enough time for the water to penetrate into the slope, resulting in insufficient water for the slope vegetation and affecting the growth of the slope vegetation; for steep mountain slopes, laying vegetation mats on the slope may cause the slope soil to slide under the action of gravity; if it rains heavily or heavily, the steep slope is more likely to cause the laid vegetation mat or spray-broadcast substrate to slide down with the slope soil in the rain erosion, and even the problem of soil layer collapse. In addition, for soil and rock mountain slopes, there may be unevenness on the slope, which is more prone to loss of artificial constructed soil on steep slopes under the erosion of rainwater, and the single plant species makes the current plant community reconstruction on steep slopes with a slope of more than 65 degrees often have the problem of "green for one year and yellow for four years". SUMMARY

[0005] Therefore, the technical problem to be solved by the present application is to provide a slope water and soil conservation plant community reconstruction method to solve the problem of poor stability or annual decline of the slope water and soil conservation plant community when reconstructing steep slopes with a slope of more than 65 degrees.

[0006] To solve the above technical problems, the present application provides the following technical solutions:

[0007] A slope water and soil conservation plant community reconstruction method, comprising the following steps:

[0008] Step (1), in spring or autumn, spraying the spray-broadcast material with herbaceous plant seeds on the slope surface by using the spray-broadcast method;

[0009] Step (2), laying a protective net after the end of the spraying and seeding, and forming a pre-protective slope surface on the slope surface after maintenance management;

[0010] Step (3), the overground part of the herbaceous plants on the pre-protective slope surface is pressed down and filled with a covering substrate soil to form a substrate soil layer in the fall of the same year for the spring spraying and seeding or in the spring of the next year for the autumn spraying and seeding;

[0011] Step (4), secondary slope protection seeding is carried out on the substrate soil layer, a protective net is laid after the seeding is completed, and a water and soil conservation plant community is formed on the slope surface after maintenance management.

[0012] In the above-mentioned slope water and soil conservation plant community reconstruction method, warm-season type herbaceous plant seeds are selected for the spring spraying and seeding, and cold-season type herbaceous plant seeds are selected for the autumn spraying and seeding.

[0013] In the above-mentioned slope water and soil conservation plant community reconstruction method, the warm-season type herbaceous plant seeds are obtained by mixing dog tooth grass, bahia grass and Chinese alpine plant in a mass ratio of (2-3):(1-1.5):(0.5-0.8); the cold-season type herbaceous plant seeds are obtained by mixing alkali grass, bluegrass, fruit ridge grass and dogtail grass in a mass ratio of (1-2):(1-2):(1-1.5):(0.3-0.5); and the spraying and seeding amount of the herbaceous plant seeds is 10-15 g / m 2 .

[0014] In the above-mentioned slope water and soil conservation plant community reconstruction method, in Step (1), the spraying and seeding material is composed of water and substrate soil, and the mass ratio of water to substrate soil is 1:1-1.5; and the substrate soil in Step (1) and Step (3) is composed of the following components in parts by weight: 80-100 parts by weight of slope surface soil, 50-70 parts by weight of humus soil, 5-10 parts by weight of adhesive and 1-3 parts by weight of root promoter.

[0015] In the above-mentioned slope water and soil conservation plant community reconstruction method, the organic matter content in the humus soil is 60-70 wt%; and the adhesive is obtained by mixing sodium silicate and polyacrylamide in a weight ratio of 1:(3-5).

[0016] The root promoter is composed of the following components in parts by weight: 60-80 parts by weight of white carbon black, 10-15 parts by weight of 1-2 wt% polyvinyl alcohol aqueous solution, 3-5 parts by weight of sodium nitrophenol, 1-3 parts by weight of amine fresh ester, 1-3 parts by weight of pyraclostrobin, 2-5 parts by weight of zinc lignin sulfonate and 1-2 parts by weight of borax.

[0017] The preparation method of the root promoter in the above-mentioned slope water and soil conservation plant community reconstruction method comprises the following steps:

[0018] Step (1-1), the polyvinyl alcohol aqueous solution is stirred and then sodium polynitrophenol, amiloxate, pyraclostrobin, borax and zinc lignosulfonate are added in sequence, and stirring is performed until the mixture is uniformly mixed to obtain a mixed dispersion liquid;

[0019] Step (1-2), the mixed dispersion liquid is added with white carbon black, and stirring is performed until the mixed dispersion liquid is adsorbed on the white carbon black to obtain root-promoting raw material particles, i.e., a root-promoting agent.

[0020] In the above-mentioned slope water and soil conservation plant community reconstruction method, in step (1), the spray planting thickness of spray seeding is 3-6 cm; before spray seeding, the slope is sprayed with water, and then the spray seeding is performed from top to bottom; in step (2), after the spray seeding is completed, non-woven fabric is laid as a protective net, and the protective net is removed after the seedlings grow to 2-5 cm.

[0021] In the above-mentioned slope water and soil conservation plant community reconstruction method, in step (3), the operation method for pressing down the above-ground parts of the herbaceous plants is as follows: the slope is divided into two or more pressing down areas from top to bottom along the slope inclination direction; each pressing down area includes a strike pressing down area and a dip pressing down area from top to bottom, and the area ratio of the strike pressing down area to the dip pressing down area is 4-9:1; the above-ground parts of the herbaceous plants in the strike pressing down area are pressed down along the horizontal strike direction of the slope, and the above-ground parts of the herbaceous plants in the dip pressing down area are pressed down from bottom to top along the slope inclination direction.

[0022] In the above-mentioned slope water and soil conservation plant community reconstruction method, in step (4), when the secondary slope protection seeding is performed, the perennial warm-season herbaceous plants, perennial cold-season herbaceous plants, semi-shrubs and shrubs are seeded according to the quantity ratio (10-20):(10-20):(20-30):1, and the seeding quantity of the perennial warm-season herbaceous plants is 4-7 g / m 2 .

[0023] In the above-mentioned slope water and soil conservation plant community reconstruction method, in step (4), after the seeding is completed, non-woven fabric is laid as a protective net, and the protective net is removed after the seedlings grow to 2-5 cm.

[0024] The technical scheme of the present application has the following beneficial technical effects:

[0025] 1. This invention employs hydroseeding to sow warm-season or cool-season herbaceous plant seeds in spring or autumn, respectively, to initially form a pre-protected slope surface on a relatively steep slope. After six months of growth, a secondary slope protection is applied to the already formed slope surface, at which point the pre-protected slope surface acts as a vegetation blanket. Because the pre-protected slope surface is integrated with the slope surface, it effectively solves the problem of vegetation blankets sliding off in chunks due to gravity or rainwater erosion on steep slopes. Simultaneously, the pre-protected slope surface stores a certain amount of herbaceous plant seeds and roots, which can continue to germinate during subsequent growth, further improving the stability of the reconstructed plant community.

[0026] 2. Sowing warm-season herbaceous plant seeds in spring, or sowing cool-season herbaceous plant seeds in autumn, and selecting a specific ratio and variety of herbaceous plant seeds for mixed sowing, allows some herbaceous plants on the pre-protected slope to be near dormancy six months later, which is more conducive to the above-ground compaction work. At the same time, some herbaceous plants will be in their growth period. After being compacted and covered with substrate soil, the herbaceous plants not only play a good role in water retention, but also promote the reproduction of soil microorganisms and improve soil fertility. In addition, this hydroseeding method allows the secondary slope protection to be carried out in autumn or spring, which is conducive to the smooth progress of the secondary slope protection.

[0027] 3. By adding adhesives and root promoters to the substrate soil for hydroseeding and sowing, this invention can effectively improve the water retention of the soil, providing sufficient water for plant growth. At the same time, the self-made root promoter with slow-release effect of this invention can promote the development of lateral roots and elongation of taproots of plants on the pre-protected slope, improve the anchoring effect of the pre-protected slope on the slope, and promote the rapid elongation and growth of the root system of plants on the secondary slope, so that they intertwine with the herbaceous plants remaining on the pre-protected slope, thereby further improving the stability of the soil and water conservation plant community.

[0028] 4. In order to improve the stability of the substrate soil on the pre-slope surface during secondary slope protection, the present invention performs a specific method of zonal compaction of the above-ground parts of herbaceous plants. This compaction method can make the substrate soil filling and covering the above-ground parts of herbaceous plants bond more tightly with the pre-slope surface, which is more conducive to maintaining the stability and longevity of the soil and water conservation plant community. Detailed Implementation

[0029] Example 1

[0030] This embodiment focuses on the reconstruction of slope soil and water conservation plant communities on both sides of a mountain road in a mountainous area of ​​Henan Province with a slope gradient of 72 degrees. The reconstruction method includes the following steps:

[0031] Step (1), in March, spray the seed of warm-season grass on the slope surface by using spray seeding method; the spray seeding thickness is 5 cm; before spray seeding, spray water on the slope surface, and then spray seeding from top to bottom; the spray seeding amount of grass seed is 10 g / m 2 ; the warm-season grass seed is mixed by using centipede grass, bahia grass and Chinese lovegrass according to the mass ratio of 2:1.5:0.8; in addition to the grass seed, the spray seeding material is composed of water and the substrate soil in step (3), and the mass ratio of water to substrate soil is 1:1; the substrate soil is composed of 80 parts by weight of slope soil, 50 parts by weight of humus soil, 8 parts by weight of adhesive and 2 parts by weight of root promoter. The humus soil has an organic matter content of 63 wt%, which is commercially available (or can be prepared by oneself); the adhesive is mixed by using sodium silicate and polyacrylamide according to the weight ratio of 1:5; the preparation method of the root promoter is as follows:

[0032] Step (1-1), 5 parts by weight of sodium polynitrophenol, 2 parts by weight of amiloxate, 2 parts by weight of pyraclostrobin, 1 part by weight of borax and 4 parts by weight of zinc lignin sulfonate are sequentially added into 15 parts by weight of a polyvinyl alcohol aqueous solution with a mass fraction of 2 wt% while stirring, and then stirred and mixed uniformly to obtain a mixed dispersion liquid;

[0033] Step (1-2), 60 parts by weight of white carbon black is added into the mixed dispersion liquid, and stirred to make the mixed dispersion liquid adsorbed on the white carbon black to obtain root-promoting raw material particles, i.e. the root promoter. The root promoter uses white carbon black as an adsorption material, has good slow-release effect, and the components can play a synergistic effect to promote the growth of plant root system lateral roots and the elongation of main roots.

[0034] Step (2), after the spray seeding, non-woven fabric is laid as a protective net to form a pre-protected slope surface after maintenance and management; the protective net is removed when the seedlings grow to 2-5 cm.

[0035] Step (3), in September of the same year, the aboveground part of the grass on the pre-protected slope surface is pressed down and filled with the substrate soil to form a substrate soil layer; the composition of the substrate soil is the same as that in step (2); the operation method for pressing down the aboveground part of the grass is as follows:

[0036] The slope surface is divided into two or more groups of trampling zones along the slope surface inclination direction from top to bottom; each group of trampling zones includes in turn strike trampling zones and inclination trampling zones from top to bottom, and the area ratio of the strike trampling zones to the inclination trampling zones is 9:1; the aboveground part of the herbaceous plants in the strike trampling zones is trampled along the horizontal strike direction of the slope surface, and the aboveground part of the herbaceous plants in the inclination trampling zones is trampled from bottom to top along the slope surface inclination direction. The slope surface is divided into different trampling zones, and the strike trampling zones and the inclination trampling zones are divided in the different trampling zones. During the trampling operation, the trampling is sequentially performed from bottom to top, the aboveground part of the herbaceous plants in the inclination trampling zones is trampled upward, and the herbaceous plants adjacent to the strike trampling zones stretch toward the strike trampling zones due to being trampled. At this time, the herbaceous plants in the strike trampling zones are trampled along the strike direction, so that the part of the plant body that stretches toward the strike trampling zones from the inclination trampling zones is pressed in the lower layer. As a result, the soil in the lower layer of the inclination trampling zones is "covered" by the plant body and its root system, and the soil sliding due to gravity can be avoided. On the entire slope surface, the strike trampling zones and the inclination trampling zones are arranged alternately, so that the anchoring effect of the plant body on the soil of the slope surface can be effectively enhanced.

[0037] Step (4), secondary slope protection seeding is performed on the substrate soil layer, non-woven fabric is laid as a protection net after the seeding is completed, and the protection net is removed when the seedlings grow to 2-5 cm; and a water and soil conservation plant community is formed on the slope surface after maintenance and management. When the secondary slope protection is seeded, perennial warm-season herbaceous plants, perennial cold-season herbaceous plants, semi-shrubs and shrubs are seeded according to a quantity ratio of 10:10:30:1, and the seeding quantity of the perennial warm-season herbaceous plants is 7 g / m 2 ; in this embodiment, the perennial warm-season herbaceous plants are obtained by mixing Cynodon dactylon and Paspalum notatum according to a mass ratio of 3:1; the cold-season herbaceous plant seeds are obtained by mixing Poa annua, Festuca rubra and Setaria viridis according to a mass ratio of 2:1:0.3; the semi-shrubs are Artemisia sphaerocephala; and the shrubs are obtained by mixing Lespedeza bicolor and Forsythia suspensa according to a quantity ratio of 1:4.

[0038] After the slope surface water and soil conservation plant community is reconstructed in this embodiment, the slope surface vegetation coverage reaches 95.4%, and the water and soil conservation plant community basically does not decline and has good plant community stability after being reconstructed for 3 years.

[0039] Embodiment 2

[0040] In this embodiment, the slope surface water and soil conservation plant community is reconstructed for the slope surface with a slope of 72 degrees on both sides of a mountain road in a certain mountainous area in Henan, and the reconstruction method includes the following steps:

[0041] Step (1), in September, the spray-seeding material containing cold-season herbaceous plant seeds is sprayed on the slope surface by using the spray-seeding method; the spray-seeding thickness is 5 cm; before the spray-seeding, the slope surface is first sprayed with water, and then the spray-seeding is performed from top to bottom; and the spray-seeding dosage of the herbaceous plant seeds is 15 g / m2 The herbaceous plant seeds of the cold season type are obtained by mixing alkali grass, bluegrass, fairway grass and foxtail grass in a mass ratio of 1:2:1.5:0.5; the spray-seeding material is composed of water and the matrix soil in step (3), and the mass ratio of water to the matrix soil is 1:1; the matrix soil is composed of 100 parts by weight of slope soil, 70 parts by weight of humus soil, 10 parts by weight of adhesive and 3 parts by weight of root promoter. The humus soil has an organic matter content of 67 wt%; the adhesive is obtained by mixing sodium silicate and polyacrylamide in a weight ratio of 1:3; and the root promoter is prepared by mixing 5 parts by weight of sodium dinitrophenol, 2 parts by weight of amiloxate, 2 parts by weight of pyraclostrobin, 1 part by weight of borax and 4 parts by weight of zinc lignin sulfonate, adding water and stirring to obtain a mixture, and then adding 60 parts by weight of slope soil and stirring to obtain the root promoter.

[0042] Step (2): After the spray-seeding is completed, non-woven fabric is laid as a protective net, and a pre-protective slope surface is formed on the slope surface after maintenance and management; the protective net is removed when the seedlings grow to a height of 2-5 cm.

[0043] Step (3): In March of the next year, the aboveground parts of the herbaceous plants on the pre-protective slope surface are pressed down and filled with the matrix soil to form a matrix soil layer; the composition of the matrix soil is the same as that in step (2); and the operation method for pressing down the aboveground parts of the herbaceous plants is as follows:

[0044] The slope surface is divided into two or more groups of pressing-down areas from top to bottom along the slope direction; each group of pressing-down areas includes a strike pressing-down area and a dip pressing-down area from top to bottom, and the area ratio of the strike pressing-down area to the dip pressing-down area is 9:1; the aboveground parts of the herbaceous plants in the strike pressing-down area are pressed down along the horizontal strike direction of the slope surface, and the aboveground parts of the herbaceous plants in the dip pressing-down area are pressed down from bottom to top along the slope direction.

[0045] Step (4): The seedlings of the perennial warm-season herbaceous plants, the perennial cold-season herbaceous plants, the semi-shrubs and the shrubs are planted in the matrix soil layer to form a secondary protective slope, and a protective net is laid after the planting is completed to form a water and soil conservation plant community on the slope surface. The perennial warm-season herbaceous plants, the perennial cold-season herbaceous plants, the semi-shrubs and the shrubs are planted in a quantity ratio of 15:15:30:1, and the planting quantity of the perennial warm-season herbaceous plants is 4 g / m 2 In this embodiment, the perennial warm-season herbaceous plants are obtained by mixing centipede grass, bahia grass and Chinese alpine plant in a mass ratio of 2.5:1.5:0.5; the cold season herbaceous plant seeds are obtained by mixing bluegrass, fairway grass and foxtail grass in a mass ratio of 2:1:0.3; the semi-shrubs are artemisia japonica; and the shrubs are obtained by mixing huji and white flower in a quantity ratio of 1:4.

[0046] The slope vegetation coverage of the slope soil and water conservation plant community in this embodiment reaches 91.9% after the reconstruction of the slope soil and water conservation plant community is completed, and the plant community does not obviously decline after being reconstructed for 3 years, and the stability of the plant community is good but slightly worse than that in embodiment 1.

[0047] Embodiment 3

[0048] In this embodiment, the reconstruction of the slope soil and water conservation plant community is carried out on the slope with a slope of 72 degrees on both sides of a mountain road in a mountainous area in Henan, and the reconstruction method comprises the following steps:

[0049] Step (1), in March, the spray seeding method is used to spray the spray seeding material containing the seeds of warm-season herbaceous plants on the slope, the spray seeding thickness is 5 cm, before the spray seeding, the slope is first sprayed with water, and then the spray seeding is carried out from top to bottom, and the spray seeding amount of the herbaceous plant seeds is 12 g / m 2 ; the seeds of the warm-season herbaceous plants are obtained by mixing the seeds of centipedegrass, bahia grass and Chinese lovegrass at a mass ratio of 3:1:0.6; in addition to the herbaceous plant seeds, the spray seeding material is composed of water and the substrate soil in step (3), and the mass ratio of the water to the substrate soil is 1:1.2; the substrate soil is composed of the following components in parts by weight: 90 parts by weight of slope soil, 60 parts by weight of humus soil, 6 parts by weight of adhesive and 1.5 parts by weight of root promoter. The organic matter content in the humus soil is 69 wt%; the adhesive is obtained by mixing sodium silicate and polyacrylamide at a weight ratio of 1:4; and the preparation method of the root promoter is as follows:

[0050] Step (1-1), 15 parts by weight of polyvinyl alcohol aqueous solution with a mass fraction of 1.5 wt% is added with 3 parts by weight of sodium polynitrophenol, 3 parts by weight of amiloxate, 2 parts by weight of pyraclostrobin, 2 parts by weight of borax and 5 parts by weight of zinc lignin sulfonate in sequence while stirring, and then the mixture is uniformly stirred and mixed to obtain a mixed dispersion liquid;

[0051] Step (1-2), 80 parts by weight of white carbon black is added to the mixed dispersion liquid, and the mixed dispersion liquid is adsorbed onto the white carbon black by stirring to obtain root-promoting raw material particles, i.e. the root promoter.

[0052] Step (2), after the spray seeding is completed, non-woven fabric is laid as a protective net, and a pre-protected slope is formed on the slope after maintenance and management; the protective net is removed when the seedlings grow to 2-5 cm after maintenance and management.

[0053] Step (3), in September of the same year, the aboveground part of the herbaceous plants on the pre-protected slope is pressed down and filled with the substrate soil to form a substrate soil layer; the composition of the substrate soil is the same as that in step (2); and the aboveground part of the herbaceous plants is randomly pressed down.

[0054] Step (4), seeding for secondary slope protection in the matrix soil layer, laying non-woven fabric as a protective net after seeding, and removing the protective net when the seedlings grow to 2-5 cm; forming a water and soil conservation plant community on the slope surface after maintenance management. When seeding for secondary slope protection, perennial warm-season grasses, perennial cold-season grasses, semi-shrubs and shrubs are seeded in a quantity ratio of 20:10:20:1, and the seeding quantity of the perennial warm-season grasses is 7 g / m 2 In this embodiment, the perennial warm-season grasses are a mixture of Bermudagrass and centipede grass in a mass ratio of 3:1; the cold-season grass seeds are a mixture of bluegrass, redtop and foxtail grass in a mass ratio of 2:1:0.3; the semi-shrubs are Chinese artichoke; and the shrubs are a mixture of kudzu and whiteflower in a quantity ratio of 1:4.

[0055] After the slope water and soil conservation plant community is reconstructed in this embodiment, the slope vegetation coverage reaches 90.5%, and the water and soil conservation plant community has no obvious recession after 3 years of reconstruction, and has good plant community stability, but is slightly worse than that in Embodiment 1.

[0056] Obviously, the above embodiments are merely examples for clear illustration, and are not intended to limit the embodiments. Based on the above description, other different forms of changes or variations can be made by those of ordinary skill in the art. All the embodiments do not need to be exhausted, and the changes or variations derived therefrom are still within the protection scope of the patent application claims.

Claims

1. A method for reconstructing plant communities for soil and water conservation on slopes, characterized in that, Includes the following steps: Step (1): In spring or autumn, spray the hydroseeding material containing herbaceous plant seeds onto the slope using the hydroseeding method. In spring, select warm-season herbaceous plant seeds for hydroseeding; in autumn, select cool-season herbaceous plant seeds for hydroseeding. The warm-season herbaceous plant seeds are obtained by mixing Bermuda grass, Bahia grass, and Goosegrass in a mass ratio of (2-3):(1-1.5):(0.5-0.8). The cool-season herbaceous plant seeds are obtained by mixing Alkali grass, Kentucky bluegrass, Goosegrass, and Foxtail grass in a mass ratio of (1-2):(1-2):(1-1.5):(0.3-0.5). The amount of herbaceous plant seeds used for hydroseeding is 10-15 g / m². 2 ; Step (2): After the spraying is completed, a protective net is laid, and after maintenance and management, a pre-protected slope surface is formed on the slope. Step (3): Spring hydroseeding is done in the autumn of the same year, and autumn hydroseeding is done in the spring of the following year. The above-ground parts of the herbaceous plants on the pre-protected slope are pressed down and filled with substrate soil to form a substrate soil layer. The operation method for pressing down the above-ground parts of the herbaceous plants is as follows: Divide the slope into two or more pressing areas from top to bottom along the slope direction. Each pressing area includes a directional pressing area and a inclined pressing area from top to bottom. The ratio of the area of ​​the directional pressing area to the inclined pressing area is 4-9:

1. The above-ground parts of the herbaceous plants in the directional pressing area are pressed down along the horizontal direction of the slope, and the above-ground parts of the herbaceous plants in the inclined pressing area are pressed down from bottom to top along the slope direction. Step (4): Sow seeds for secondary slope protection in the substrate soil layer. After sowing, lay protective netting. After maintenance and management, a soil and water conservation plant community will be formed on the slope. In addition to herbaceous plant seeds, the spraying material consists of water and substrate soil, with a water-to-substrate soil mass ratio of 1:1-1.

5. The substrate soil in steps (1) and (3) consists of the following components in parts by weight: 80-100 parts by weight of slope soil, 50-70 parts by weight of humus, 5-10 parts by weight of binder and 1-3 parts by weight of root promoter. The organic matter content in the humus is 60-70 wt%. The binder is a mixture of sodium silicate and polyacrylamide in a weight ratio of 1:(3-5). The root promoter consists of the following components in parts by weight: 60-80 parts by weight of silica, 10-15 parts by weight of 1-2 wt% polyvinyl alcohol aqueous solution, 3-5 parts by weight of sodium nitrophenolate, 1-3 parts by weight of amino acid ester, 1-3 parts by weight of pyraclostrobin, 2-5 parts by weight of zinc lignosulfonate and 1-2 parts by weight of borax.

2. The method for reconstructing slope soil and water conservation plant communities according to claim 1, characterized in that, The preparation method of the root-promoting agent includes the following steps: Step (1-1): While stirring, add sodium nitrophenolate, aminoethyl ester, pyraclostrobin, borax and zinc lignosulfonate to the polyvinyl alcohol aqueous solution in sequence, and stir to mix evenly to obtain a mixed dispersion. Step (1-2): Add silica to the mixed dispersion and stir so that the mixed dispersion is adsorbed onto the silica, and the resulting root-promoting raw material particles are the root-promoting agent.

3. The method for reconstructing slope soil and water conservation plant communities according to claim 1, characterized in that, In step (1), the spraying thickness is 3-6cm; before spraying, the slope is sprayed with water, and then spraying is carried out from top to bottom; in step (2), after spraying, non-woven fabric is laid as a protective net, and the protective net is removed after the seedlings grow to 2-5cm.

4. The method for reconstructing slope soil and water conservation plant communities according to claim 1, characterized in that, In step (4), during the secondary slope protection sowing, perennial warm-season herbaceous plants, perennial cool-season herbaceous plants, semi-shrubs, and shrubs are sown in a ratio of (10-20):(10-20):(20-30):1, and the sowing quantity of perennial warm-season herbaceous plants is 4-7 g / m². 2 .

5. The method for reconstructing slope soil and water conservation plant communities according to claim 1, characterized in that, In step (4), after sowing, non-woven fabric is laid as a protective net. After maintenance and management, the protective net is removed when the seedlings grow to 2-5cm.