Lightweight spray seeding material suitable for ecological restoration of slopes in dry-hot valley regions and preparation method thereof

Abstract

The application provides a kind of light spray seeding material suitable for dry-hot valley area slope ecological restoration and its preparation method, by adding high proportion organic matter material with loose porous structure, it is inserted between wood fiber network, play the role of physical support and separation, improve the pore structure, air permeability and drainage of substrate.Further utilize weak acid organic matter material, especially humus and ammonium dihydrogen phosphate synergistic effect, moderate and lasting adjustment of substrate pH value, can adjust the pH value of alkaline slope to the near neutral range suitable for plant growth.Through the relay cooperation of composted organic fertilizer, humic acid slow-release fertilizer and bio-organic fertilizer in organic fertilizer combination, combined with the available nitrogen and phosphorus provided by ammonium dihydrogen phosphate, the long-term nutrient content of soil organic matter is significantly improved, the long-term nutrient supply in the whole growth cycle of slope vegetation restoration is realized, so as to effectively improve the effect of soil and water conservation and ecological restoration of dry-hot valley area slope.

Description

Technical Field

[0001] This invention relates to the field of slope ecological restoration technology, and in particular to a lightweight hydroseeding material suitable for slope ecological restoration in arid and hot valley areas and its preparation method. Background Technology

[0002] The Jinsha River dry-hot valley region has a hot and dry climate with strong evaporation and low rainfall, mainly concentrated in the summer months of June to August, making its natural ecological environment extremely fragile. Construction projects such as highways, water conservancy projects, and mines in this area have created numerous exposed slopes. These slopes often have thin or even completely missing soil layers, and in some areas, the slope soil and rock exhibit alkaline characteristics, negatively impacting plant growth. Currently, the commonly used topsoil spraying technology in slope ecological restoration requires a large amount of topsoil as the substrate. However, in the Jinsha River dry-hot valley region, high-quality topsoil resources are extremely scarce, and the cost of transporting topsoil is very high. Furthermore, the soil extraction process disturbs the surface and may cause secondary damage to the ecological environment. Some existing technologies use cement as a binder to enhance the adhesion of the substrate to the slope, but cement itself is alkaline, which further exacerbates the alkalinity problem of the sprayed substrate, hindering plant growth.

[0003] Existing hydroseeding technologies have reported hydroseeding substrates with wood fiber as the main material. For example, CN112080283A discloses a soilless hydroseeding organic material, its preparation method, and its applications. Besides using a large amount of wood fiber, it also adds certain organic materials and microbial agents. However, in this type of technology, the wood fiber is prone to caking during long-term use, leading to decreased substrate porosity and poor air permeability. This inhibits plant root development and water infiltration, and results in a lack of sustained fertility. Relying solely on wood fiber or adhesives is insufficient to simultaneously solve the problems of caking and structural stability. Regarding pH adjustment, existing hydroseeding substrates mostly use external acids or acidic salts as single agents. For example, CN114477937A discloses a low-carbon solidifying agent and a vegetation substrate for slope ecological restoration, along with their preparation methods. It points out that traditional methods of lowering pH using acid neutralization and other techniques affect the microstructure of hydration products within the substrate, leading to decreased strength and durability. Polymer sealing technology, on the other hand, is expensive, and environmental radiation can damage the polymers used for sealing, causing alkaline substances to dissolve later. Both methods have unsatisfactory long-term effects. Existing pH adjustment technologies suffer from problems such as drastic adjustment processes, easy pH rebound, short-lasting effects, complex construction, and high costs. Furthermore, they lack systematic optimization for the unique environment of the Jinsha River's dry-hot valley, characterized by intense evaporation and difficulty in water retention. Regarding nutrient supply, existing hydroseeding substrates often use fast-acting fertilizers, which have short-lasting effects and are insufficient to support the long-term self-sustaining of slope vegetation. For example, Chinese invention patent CN104782383B discloses a hydroseeding substrate for ecological restoration of high and steep slopes, its preparation method, and its application. The amount of planting soil is as high as 53%, while the organic fertilizer is only 0.35%, and it is a fast-acting type with a short-lasting effect, making it difficult to meet the long-term growth needs of vegetation. This technology still relies heavily on imported soil and requires a large amount of planting soil. Moreover, the fertilizer is a fast-acting compound fertilizer, which cannot achieve long-term fertilization. Another example is CN 113994853 A, which discloses a soilless hydroseeding method for wood fiber used in the ecological restoration of high and steep slopes. It mainly focuses on improving the hydroseeding equipment. The substrate material is mainly composed of wood fiber, and the components are thoroughly mixed according to the specified proportions to obtain a mixture. However, it does not mention the proportions of each component in the hydroseeding material, the preparation method, or the addition of organic matter to increase soil nutrient sustainability. Soil organic matter is the core substance for maintaining soil fertility and good structure. A lack of organic matter or a low organic matter content in the substrate can easily lead to soil compaction and rapid decline in fertility, even with short-term application of chemical fertilizers, making it impossible to achieve long-term self-sustaining ecological restoration.

[0004] Therefore, there is an urgent need in this field to develop a lightweight hydroseeding material that is suitable for the ecological restoration of dry-hot valley slopes in the Jinsha River, requiring no topsoil, lightweight, with excellent water retention, suitable pH value, and long-lasting fertility. Summary of the Invention

[0005] The purpose of this invention is to provide a lightweight hydroseeding material and its preparation method suitable for ecological restoration of slopes in arid and hot river valleys, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution:

[0007] This invention provides a lightweight hydroseeding material suitable for ecological restoration of slopes in hot and dry river valleys. By weight percentage, it consists of the following dry components: 50%~60% wood fiber, 25%~30% organic matter, 5%~10% combination of long-acting organic and inorganic fertilizers, and 3%~5% greening additives, with the sum of the weight percentages of the above components being 100%. Adding an appropriate amount of water and shrub and grass seeds completes the lightweight hydroseeding material.

[0008] Preferably, the wood fiber is a high-quality thermally refined wood fiber with a fiber length of 2 mm to 38 mm, an ash content of <5%, a water absorption rate of ≥9%, a pH value of 5.5 to 6.5, and a bulk density of 80 kg / m³ to 120 kg / m³.

[0009] Preferably, the organic material is composed of plant residues, humus and minerals that have undergone natural carbonization and degradation but have not been completely decomposed from agricultural and forestry waste raw materials. The organic matter content is ≥50%, the water absorption rate is ≥5%, the pH value is 5.0~6.5, and the fiber structure is moderate (fine or medium-coarse fiber).

[0010] Preferably, the organic fertilizer combination is composed of well-rotted organic fertilizer, slow-release humic acid fertilizer, and bio-organic fertilizer; the inorganic components are mainly ammonium dihydrogen phosphate, supplemented with (N+P2O5+K2O), with a pH of 5.5~8.0 and a moisture content of ≤10%, and a slow-release or coated formula is preferred, which can make the fertilizer effect last for 2~3 years, which is more conducive to long-term slope construction.

[0011] Preferably, the greening additive is composed of an adhesive, a water-retaining agent, and a soil conditioner in a mass ratio of 5:3:2; the adhesive is a high-molecular-weight polyacrylamide (PAM) type, preferably a biodegradable, non-toxic, and highly flocculating synthetic polymer adhesive (such as PAM type), with a unit dosage of 30 g / m²~40 g / m²; the water-retaining agent is a copolymer of polyacrylate (potassium salt or sodium salt) and polyacrylamide, with a water absorption ratio of over 300 times, and a unit dosage of 10 g / m²~25 g / m²; the soil conditioner includes two types of soil conditioners: humic acid-based acidic soil conditioner and lime-based alkaline soil conditioner, mainly used to adjust the pH value of the lightweight hydroseeding material to a suitable range of 5.5~7.5.

[0012] Preferably, the lightweight hydroseeding material is mainly composed of wood fiber and organic matter, with the sum of their weight percentages being ≥75%. The dry material usage per unit area for slope hydroseeding is 0.5 kg / m² to 2.5 kg / m², and no planting soil is used.

[0013] This invention also provides a method for preparing a lightweight hydroseeding material suitable for ecological restoration of slopes in hot and dry river valleys, comprising the following steps: weighing the dry weight of each component of wood fiber, organic matter, long-acting organic fertilizer-inorganic fertilizer combination and greening additive according to the ratio as dry material; adding water accounting for 30 to 40 times the total weight of the dry material to a mixing device, and gradually adding the dry material while stirring, stirring for about 10 minutes to form a uniform slurry mixture, which is the matrix layer material.

[0014] Preferably, the method further includes the step of preparing seed layer material: taking 10% to 15% of the total weight of the matrix layer material and mixing it evenly with the seeds of shrubs and grasses to obtain the seed layer material.

[0015] Preferably, the amount of shrub and grass plant seeds added accounts for about 5% of the total dry weight.

[0016] Preferably, a wet hydroseeding machine is used for hydroseeding. The substrate material is sprayed in multiple layers. After the surface moisture of the previous sprayed slurry has evaporated naturally, dried slightly, and no longer flows obviously, the next layer of substrate is sprayed until the thickness of the sprayed substrate layer reaches 7cm to 8cm.

[0017] Preferably, a wet hydroseeding machine is used to spray seed layer material multiple times on the substrate layer until the thickness reaches 1cm to 2cm.

[0018] Preferably, it is applicable to soil and water conservation and ecological restoration projects for soil slopes, rock slopes and strongly weathered rock slopes with a gradient generally gentler than 60° in dry and hot river valley areas.

[0019] The present invention achieves the following beneficial technical effects compared to the prior art:

[0020] This invention provides a lightweight hydroseeding material and its preparation method suitable for ecological restoration of slopes in arid and hot river valleys, offering significant beneficial effects. Firstly, this invention uses wood fiber and organic matter as its core components, with the two comprising more than three-quarters of the total. The dry material usage per unit area for slope hydroseeding is 0.5 kg / m² to 2.5 kg / m², completely eliminating the need for planting soil. This is significantly lower than the amount of traditional topsoil hydroseeding substrate, achieving lightweight hydroseeding material and effectively reducing slope load. Secondly, by adding a high proportion of loosely porous organic matter, which is interspersed between the wood fiber network, it provides physical support and separation, preventing wood fiber compaction. This improves the pore structure, air permeability, and drainage of the substrate, effectively avoiding the problems of compaction and inconsistent fertility in traditional wood fiber hydraulic hydroseeding substrates. Furthermore, this invention utilizes the synergistic effect of humus, a particularly abundant source of weakly acidic organic matter, with ammonium dihydrogen phosphate and greening additives to gently and persistently regulate the pH value of the substrate. This avoids the strength reduction and pH rebound problems caused by traditional acid neutralization methods, and can adjust the pH value of alkaline slopes to a near-neutral range suitable for plant growth. Finally, through the relay combination of well-rotted organic fertilizer, slow-release humic acid fertilizer, and bio-organic fertilizer in the organic fertilizer blend, combined with the readily available nitrogen and phosphorus provided by ammonium dihydrogen phosphate, this invention achieves long-term nutrient supply throughout the entire growth cycle, significantly increasing the content of soil organic matter and readily available nutrients, greatly improving vegetation coverage, enhancing resistance to rainwater erosion, and supporting the long-term self-sustaining of slope vegetation. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a component distribution diagram of the lightweight hydroseeding material of the present invention;

[0023] Figure 2 This is a schematic diagram illustrating the preparation of the lightweight hydroseeding material of the present invention;

[0024] Figure 3 This image shows a comparison of the application effects of the lightweight hydroseeding material used in the ecological restoration of a hydropower station slope in a dry-hot valley area, and a comparative material. Detailed Implementation

[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] The purpose of this invention is to provide a lightweight hydroseeding material and its preparation method suitable for ecological restoration of slopes in arid and hot river valleys, in order to solve the problems existing in the prior art.

[0027] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0028] Unless otherwise specified, all raw materials, reagents, instruments, and equipment used in the following examples and comparative examples can be purchased commercially or prepared using existing methods. The selected test slope was a highway slope in the dry-hot valley of the Jinsha River, with a slope height of 4.86 m, a slope length of 79.0 m, an average slope of 38°, an east-facing aspect of 98°, a pristine soil pH of 8.05, organic matter of 2.41 g / kg, available nitrogen of 5.90 mg / kg, available phosphorus of 2.05 mg / kg, and available potassium of 46.27 mg / kg. The soil type was mainly coarse skeletal soil and calcareous soil.

[0029] Example 1

[0030] This embodiment provides a lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys. The following dry material components are weighed by weight percentage: thermally refined wood fiber (fiber length 5-15mm, bulk density approximately 100 kg / m³). 3The mixture comprises 55% organic matter (≥50% organic matter content, pH 5.5-6.5, particle size less than 10 mm), 30% slow-release organic fertilizer and inorganic fertilizer combination (the organic fertilizer combination is prepared by mixing well-rotted chicken manure, humic acid slow-release fertilizer, and bio-organic fertilizer in a ratio of 5:3:2), and 5% greening additive (composed of binder, water-retaining agent, and humic acid in a mass ratio of 5:3:2). The sum of the above components is 100%. Additionally, add water approximately 40 times the total weight of the dry materials and approximately 5% of the total weight of the dry materials seeds of shrubs and grasses (a mixture of seeds from Rumex japonicus, Rhizoma Citri Reticulatae, Magnolia denudata, Artemisia arenaria, Herba Epiphyllum, Leymus chinensis, Leymus chinensis, Leymus chinensis, Cosmos bipinnatus, etc.). During preparation, first add water to the mixing equipment, then gradually add the dry materials while stirring, continuing to stir for about 10 minutes to form a uniform slurry mixture, which is the substrate layer material. Take 15% of the substrate layer material and add the plant seeds, stirring evenly to obtain the seed layer material. Hydroseeding was carried out using a wet hydroseeding machine. First, the substrate layer material was sprayed multiple times until a thickness of 7 cm was reached. After the surface moisture of the previous sprayed slurry had naturally evaporated, dried slightly, and stopped flowing noticeably, the next spray was applied. Then, the seed layer material was sprayed multiple times until a thickness of approximately 1 cm was reached. The final dry material application rate per unit area for slope hydroseeding was 1.15 kg / m². Hydroseeding was carried out from March 25th to April 10th, 2025. The irrigation system was turned on immediately after hydroseeding, watering twice daily (morning and evening) for the first 30 days. After 30 days, the irrigation frequency was adjusted according to the weather. Monitoring showed that 60 days after hydroseeding (June 25th, 2025), the slope had good vegetation cover, with uniform emergence of herbaceous plants and small shrubs. The soil pH value dropped to 6.81, the organic matter content significantly increased to 18.78 g / kg, and the vegetation coverage reached 15.83%. 150 days after spraying (September 25, 2025), after withstanding the test of the flood season rainfall, the slope remained stable overall with no obvious signs of erosion, and the vegetation coverage further increased to 55.24%.

[0031] Example 2

[0032] This embodiment is basically the same as Embodiment 1, except that the proportion of dry materials in the lightweight hydroseeding material is different. Specifically, the proportion of wood fiber is increased, the proportion of organic matter is reduced, and the total dry material content is also appropriately reduced. By weight percentage, wood fiber accounts for 60%, organic matter 25%, the combination of long-acting organic and inorganic fertilizers 10%, and greening additives 5%, with the sum of these components being 100%. The dry material usage per unit area for slope hydroseeding prepared in this embodiment is 1.03 kg / m². The remaining components, preparation methods, construction techniques, and maintenance conditions are the same as in Embodiment 1. After 150 days of testing following hydroseeding, the slope showed good vegetation cover, a soil pH of 6.92, an organic matter content of 15.96 g / kg, and a vegetation coverage of 49.67%, demonstrating a good slope ecological restoration effect.

[0033] Example 3

[0034] This embodiment is basically the same as Embodiment 1, except that the ratio of organic fertilizer in the long-acting organic-inorganic fertilizer combination is different. In this embodiment, the organic fertilizer combination is a mixture of well-rotted chicken manure, humic acid slow-release fertilizer, and bio-organic fertilizer in a ratio of 4:3:3. All other components, ratios, preparation methods, construction techniques, and maintenance conditions are the same as in Embodiment 1. Tests showed that 150 days after spraying, the soil's available nitrogen content was 22.31 mg / kg, available phosphorus content was 10.88 mg / kg, available potassium content was 70.12 mg / kg, and vegetation coverage was 52.83%, proving that different ratios of organic fertilizer combinations can also achieve good long-acting fertilization effects.

[0035] Comparative Example 1 (Conventional Hydraulic Spraying)

[0036] This comparative example uses conventional hydroseeding technology. The following dry materials were weighed by weight percentage: 92% wood fiber, 7% ordinary organic compound fertilizer, 0.5% water-retaining agent, and 0.5% binder, totaling 100%. Approximately 40 times the total weight of water and 5% of the total weight of plant seeds (same as in Example 1) were added. During preparation, water was added to the mixing equipment first, followed by the gradual addition of dry materials while stirring. Stirring continued for 6 minutes to form a slurry mixture, which became the substrate layer material. 15% of the substrate layer material was added to the plant seeds and stirred evenly to obtain the seed layer material. A wet hydroseeder was used to spray the substrate layer multiple times to a thickness of 6-7 cm, followed by multiple sprays of the seed layer to a thickness of 1 cm. Sixty days after hydroseeding, the slope vegetation cover was sparse, the soil pH was 6.97, the organic matter content was 5.76 g / kg, and the coverage was only 9.43%. 150 days after hydroseeding, after the flood season, the slope gullies were obvious and the substrate was severely lost. There was only vegetation cover at the foot of the slope and in low-lying areas, with a coverage of only 26.21%. The soil organic matter content dropped to 3.43 g / kg, close to the original soil organic matter level.

[0037] Comparative Example 2 (Spraying material lacking organic matter)

[0038] This comparative example provides a hydroseeding material lacking the organic matter content of this invention. The following dry components were weighed by weight percentage: 90% wood fiber, 5% a combination of long-acting organic and inorganic fertilizers (composition same as in Example 1), and 5% a greening additive (composition same as in Example 1), plus an equal amount of water and seeds as in Example 1. The preparation method and construction process were the same as in Example 1. Observations showed that 60 days after hydroseeding, the substrate exhibited initial compaction; 150 days after hydroseeding, the substrate became severely compacted, with poor air permeability, poor root development, and some plants withering. The vegetation coverage was only 32.15%, far lower than the 55.24% in Example 1. This indicates that the lack of organic matter led to wood fiber compaction, severely affecting the structural stability of the substrate and vegetation growth.

[0039] Table 1 Comparison of key indicators between Example 1 and Comparative Example 1 at different times

[0040]

[0041] The comparative results of the above embodiments and comparative examples demonstrate that the lightweight hydroseeding material and its preparation method provided by this invention, through the synergistic effect of a specific ratio of wood fiber, organic matter, a combination of long-lasting organic and inorganic fertilizers, and greening additives, successfully constructs a lightweight, anti-caking, pH-appropriate, and nutrient-sustaining vegetation substrate without the use of planting soil. Compared with conventional hydraulic hydroseeding technology, the material of this invention has significant advantages in improving soil structure, regulating pH, providing long-lasting nutrients, and increasing vegetation coverage and erosion resistance. It can effectively solve the technical problems of difficult soil replacement, insufficient water retention, alkaline soil, and short-lived fertilizer effects in the ecological restoration of slopes in the dry-hot valley area of ​​the Jinsha River.

[0042] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0043] It should be noted that the components mentioned in the above embodiments are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0044] This invention has illustrated its principles and implementation methods using specific examples. The descriptions of these embodiments are merely illustrative of the method and its core ideas; furthermore, those skilled in the art will recognize that modifications may be made to the specific implementation methods and application scope based on the principles of this invention. Therefore, the content of this specification should not be construed as limiting the invention.

Claims

1. A lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys, characterized in that, By weight percentage, it consists of the following dry components: 50%~60% wood fiber, 25%~30% organic matter, 5%~10% combination of long-acting organic and inorganic fertilizers, and 3%~5% greening additives, with the sum of the weight percentages of the above components being 100%; with the addition of an appropriate amount of water and shrub and grass seeds, it constitutes the whole lightweight hydroseeding material.

2. The lightweight hydroseeding material for ecological restoration of slopes in arid and hot river valleys according to claim 1, characterized in that, The wood fiber is a high-quality thermally refined wood fiber with a fiber length of 2mm to 38mm, ash content of <5%, water absorption rate of ≥9%, pH value of 5.5 to 6.5, and bulk density of 80 kg / m³ to 120 kg / cm³.

3. The lightweight hydroseeding material for ecological restoration of slopes in arid and hot river valleys according to claim 1, characterized in that, The organic material is composed of plant residues, humus, and minerals that have undergone natural carbonization and degradation but have not been completely decomposed from agricultural and forestry waste raw materials. The organic matter content is ≥50%, the water absorption rate is ≥5%, the pH value is 5.0~6.5, and the fiber structure is moderate.

4. The lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys according to claim 1, characterized in that, The long-acting organic fertilizer-inorganic fertilizer combination consists of well-rotted organic fertilizer, slow-release humic acid fertilizer, and bio-organic fertilizer. The inorganic components are mainly ammonium dihydrogen phosphate, supplemented with N, P2O5, and K2O, with a pH value of 5.5-8.0 and a moisture content of ≤10%. Slow-release or coated formulations are preferred to ensure that the fertilizer effect lasts for 2-3 years, which is more conducive to long-term slope construction.

5. The lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys according to claim 1, characterized in that, The greening additive consists of an adhesive, a water-retaining agent, and a soil conditioner in a mass ratio of 5:3:

2. The adhesive is a high-molecular-weight polyacrylamide (PAM) type, preferably a biodegradable, non-toxic, and highly flocculating synthetic polymer adhesive, with a unit dosage of 20 g / m² to 40 g / m². The water-retaining agent is a copolymer of polyacrylate and polyacrylamide, with a water absorption ratio of over 300 times, and a unit dosage of 10 g / m² to 25 g / m². The soil conditioner includes two types of soil conditioners: humic acid-based acidic soil conditioner and lime-based alkaline soil conditioner, used to adjust the pH value of the lightweight hydroseeding material to 5.5 to 7.

5.

6. The lightweight hydroseeding material for ecological restoration of slopes in arid and hot river valleys according to claim 1, characterized in that, The lightweight hydroseeding material is mainly composed of wood fiber and organic matter, with the sum of their weight percentages being ≥75%. The dry material usage per unit area for slope hydroseeding is 0.5 kg / m² to 2.5 kg / m², and no planting soil is used at all.

7. A method for preparing a lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys, as described in any one of claims 1 to 6, characterized in that... The process includes the following steps: Weigh out wood fiber, organic matter, a combination of long-acting organic and inorganic fertilizers, and greening additives as dry materials according to the specified ratio; add water, which is 30 to 40 times the total weight of the dry materials, to a mixing device; gradually add the dry materials while stirring, and stir for about 10 minutes to form a uniform slurry mixture, which is the matrix layer material.

8. The method for preparing lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys according to claim 6, characterized in that, It also includes the step of preparing seed layer material: take 10% to 15% of the total weight of the matrix layer material, mix it with the seeds of shrubs and grasses, and the seed layer material is obtained.

9. The method for preparing lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot valley areas according to claim 8, characterized in that, The amount of shrub and grass seeds added accounts for approximately 5% of the total dry weight.

10. The method for preparing lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys according to claim 6, characterized in that, The wet hydroseeding machine is used for hydroseeding construction. The substrate material is sprayed in multiple layers. After the surface of the previous sprayed slurry has naturally evaporated, dried slightly and no longer flows obviously, the next layer of substrate is sprayed until the thickness of the sprayed substrate layer reaches 7cm~8cm.

11. The method for preparing lightweight hydroseeding material suitable for ecological restoration of slopes in arid and hot river valleys according to claim 6, characterized in that, On the substrate layer, a wet hydroseeding machine is used to spray seed layer material multiple times until the thickness reaches 1cm~2cm.

12. The method for preparing lightweight hydroseeding material for ecological restoration of slopes in arid and hot valley areas according to claim 7 is applicable to soil and water conservation and ecological restoration projects for soil slopes, rock slopes and strongly weathered rock slopes with a slope generally gentler than 60° in arid and hot valley areas.

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