Spraying and mixing type plant growing base material doped with nano material and preparation method of spraying and mixing type plant growing base material

Abstract

The invention provides a spray-mixing type plant growing base material doped with a nano material and a preparation method of the spray-mixing type plant growing base material, and the spray-mixing type plant growing base material comprises 100-120 parts by weight of planting soil; 3-5 parts by weight of cement; 0.3 to 0.7 part by weight of nano silicon dioxide; 0.15 to 0.35 part by weight of carboxylated cellulose nanofiber; 1-2 parts by weight of a long-acting slow-release compound fertilizer; 6-7 parts by weight of an organic fertilizer; 0.03 to 0.5 part by weight of plant seeds; according to the invention, nano silicon dioxide is used for replacing part of cement, so that the negative effects of overhigh pH, low seed germination rate and the like caused by overhigh cement content can be reduced, and nano silicon dioxide can react with calcium hydroxide in cement to generate more stable calcium silicate gel, so that the compressive strength and durability of concrete are improved; nanocellulose can be used as a reinforcing phase to improve the tensile strength and toughness of the base material, and the nanocellulose and the reinforcing phase can work together to maintain the overall stability of the slope, effectively prevent water and soil loss and prolong the service life of the base material.

Description

Technical Field

[0001] The invention belongs to the technical field of slope ecological restoration, and relates to a spray-mixed vegetation substrate doped with nano materials and a preparation method thereof. Background Art

[0002] With the large-scale development of highway, railway, water conservancy and hydropower projects, large-scale excavation and filling have changed the surface structure, resulting in a large number of exposed soil and rock slopes, which not only destroy the original natural vegetation and soil and water conservation facilities, but also easily cause slope scouring, shallow sliding, soil erosion and other soil and water loss problems. At the same time, it has also caused great damage to the surrounding ecological environment, seriously affecting the safety, stability and sustainable development of the project. Spray-mixed vegetation substrates are often used in the rapid restoration of slope ecological environment. Generally, cement is used as a cementitious material and combined with planting soil, organic matter, plant seeds, water and other components, and then attached to the slope through spraying technology, thereby achieving rapid restoration of the slope ecological environment. Due to the addition of cement, the vegetation substrate usually has excellent anti-erosion properties. Cement can significantly improve the unconfined compressive strength of the soil. However, adding cement will increase the soil pH and generate a large amount of hydration heat, which is not conducive to the germination and later growth of plant seeds. On the other hand, due to the low rainfall in arid and semi-arid areas, the limited thickness of the slope base layer and the high slope, the soil resources required for vegetation growth are limited, resulting in very limited space for water circulation. As time goes by, vegetation can easily grow poorly or even die due to drought, leading to ecological imbalance such as slope vegetation degradation.

[0003] Nanomaterials are often used to improve the mechanical properties of various types of soils and cement-based composite materials. Nanomaterials usually have a high surface area and excellent mechanical properties, which can improve the organizational structure and strength of materials at the microscopic scale. Nanosilica can improve soil strength through physical filling in soil. In cement-based composite materials, it can react with calcium hydroxide in cement to generate more stable calcium silicate gel, thereby improving the compressive strength and durability of concrete. Nanocellulose can be used as a reinforcing phase to improve the tensile strength and toughness of the substrate. On the other hand, relevant studies have shown that the two nanomaterials, when used as soil conditioners, have potential promoting effects in improving soil water retention, improving the ability of plants to resist drought stress, promoting plant seed germination, and regulating soil pH.

[0004] In this context, exploring a spray-mixed vegetation substrate that has strong drought resistance and growth-promoting capabilities, stable mechanical properties, and environmentally friendly materials, and can effectively solve the problem of slope ecological restoration in production and construction projects is a technical problem that urgently needs to be solved in this field. Summary of the invention

[0005] In view of the problems existing in the prior art, the present invention provides a spray-mixed vegetation substrate doped with nanomaterials and a preparation method thereof, which solves the technical problems in the prior art that the vegetation concrete uses pure cement as the cementitious material, resulting in a low germination rate of plant seeds, difficulty in maintaining plant growth for a long time, resulting in vegetation degradation, and difficulty in positive succession under drought conditions, thereby providing a substrate with stable mechanical properties, strong growth-promoting ability, and the ability to improve vegetation degradation during drought periods.

[0006] The present invention is achieved through the following technical solutions: A spray-mixed vegetation substrate doped with nanomaterials, wherein the components include, by weight: Planting soil, 100-120 parts by weight; Cement, 3-5 parts by weight; Nano silicon dioxide, 0.3-0.7 parts by weight; Carboxylated cellulose nanofibers, 0.15 to 0.35 parts by weight; Long-acting slow-release compound fertilizer, 1 to 2 parts by weight; Organic fertilizer, 6-7 parts by weight; Plant seeds, 0.03-0.5 parts by weight.

[0007] Preferably, the long-acting slow-release compound fertilizer is a mixture of large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate.

[0008] Preferably, the addition ratio of the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate is (1.1-1.2):1:(1.4-1.6):(1.3-1.4) by weight, and the particle size of the large-particle urea is greater than 2 mm.

[0009] Preferably, the particle size of the planting soil is less than 2 mm, and the water content of the planting soil is less than or equal to 20%.

[0010] Preferably, the particle size of the nano-silicon dioxide is 35-50 nanometers, and the length of the carboxylated cellulose nanofibers is 35-80 nm.

[0011] Preferably, the organic fertilizer is sheep manure.

[0012] A method for preparing a spray-mixed vegetation substrate doped with nanomaterials, comprising: S1, dispersing 0.3-0.7 parts by weight of nano-silicon dioxide and 0.15-0.35 parts by weight of carboxylated cellulose nanofibers in deionized water to obtain a mixed solution 1; S2, mixing 100-120 parts by weight of planting soil, 3-5 parts by weight of cement, 1-2 parts by weight of long-acting slow-release compound fertilizer and 6-7 parts by weight of organic fertilizer to obtain a mixture 2; S3, the mixed solution 1 is mixed and stirred with the mixture 2 by spraying to obtain a spray-mixed vegetation substrate A1, and the spray-mixed vegetation substrate S1 is sprayed onto the slope surface. S4, reducing the cement content in S2 by half, keeping the contents of other components unchanged, and mixing with 0.03-0.5 parts by weight of plant seeds to obtain plant seed substrate A2; spraying the plant seed substrate A2 onto the slope surface sprayed with the spray-mixed vegetation substrate A1 in S3, and after the spraying is completed, covering the slope surface with non-woven fabric for moisture conservation and maintenance.

[0013] Preferably, the thickness of the spray-mixed vegetation substrate S1 sprayed onto the slope surface is 7-9 cm.

[0014] Preferably, the thickness of the plant seed substrate A2 sprayed onto the slope surface sprayed with the spray-mixed vegetation substrate A1 in S3 is 1.5 to 3 cm.

[0015] Preferably, the dispersion time of S1 is 2 hours.

[0016] Compared with the prior art, the present invention has the following beneficial technical effects: The invention provides a spray-mixed vegetation substrate doped with nano materials, comprising 100-120 parts by weight of planting soil; 3-5 parts by weight of cement; 0.3-0.7 parts by weight of nano silicon dioxide; 0.15-0.35 parts by weight of carboxylated cellulose nanofibers; 1-2 parts by weight of long-acting slow-release compound fertilizer; 6-7 parts by weight of organic fertilizer; and 0.03-0.5 parts by weight of plant seeds. The invention uses nano silicon dioxide to replace part of cement, thereby reducing negative effects such as excessively high pH value and low seed germination rate caused by excessive cement content. The nano silicon dioxide can react with calcium hydroxide in cement to generate more stable calcium silicate gel, thereby improving the compressive strength and durability of concrete. The nano cellulose can be used as a reinforcing phase to improve the tensile strength and toughness of the substrate. The two can work together to maintain the overall stability of the slope, effectively prevent soil and water loss, and extend the service life of the substrate. Nano-silica can participate in regulating the drought resistance of plants. The addition of carboxylated cellulose nanofibers can improve the water retention performance of the substrate, which helps the growth of plants under drought conditions. It also helps to regulate soil moisture and promote the healthy development of plant roots. It effectively solves the technical problems in the existing technology that vegetation concrete uses pure cement as a cementitious material, resulting in low plant seed germination rate, difficulty in maintaining plant growth for a long time, resulting in vegetation degradation, and difficulty in positive succession under drought conditions. It provides a material with stable mechanical properties, strong growth-promoting ability, and the ability to improve vegetation degradation during drought periods.

[0017] Furthermore, the spray-mixed vegetation substrate mixed with nanomaterials prepared by the present invention has a relatively simple preparation process and construction process. It can quickly cover a large area of ​​slope by spraying and injection, greatly shortening the construction period and reducing labor costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The present invention is a flow chart for preparing a spray-mixed vegetation substrate doped with nanomaterials. DETAILED DESCRIPTION

[0019] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which the present invention belongs. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0021] The technical solution adopted by the present invention to solve the above technical problems is: A spray-mixed vegetation concrete substrate is prepared from at least the following raw materials: Planting soil, 100-120 parts by weight; Cement, 3-5 parts by weight; Nano silicon dioxide powder, 0.3-0.7 parts by weight; Carboxylated cellulose nanofiber powder, 0.15-0.35 parts by weight; Long-acting slow-release compound fertilizer, 1 to 2 parts by weight; Organic fertilizer, 6-7 parts by weight; Plant seeds, 0.03-0.5 parts by weight; The long-acting slow-release compound fertilizer is prepared by mixing large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate.

[0022] In the long-acting slow-release compound fertilizer, the addition ratio of the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate is (1.1-1.2):1:(1.4-1.6):(1.3-1.4) by weight.

[0023] The particle size of the planting soil is less than 2 mm and the water content is less than or equal to 20%.

[0024] The nano silicon dioxide is powder with a particle size range of 35-50 nanometers, the nano cellulose is powder with a length of 35-80nm; and the organic fertilizer is sheep manure or other manure.

[0025] The preparation method of the ecological vegetation concrete substrate is as follows: Figure 1 As shown, the following steps are included: (1) 0.3-0.7 parts by weight of nano-silicon dioxide and 0.15-0.35 parts by weight of carboxylated cellulose nanofibers are dispersed in deionized water and dispersed on an ultrasonic disperser for 2 hours to obtain a nano-material mixed solution of 1; (2) 100 to 120 parts by weight of planting soil, 3 to 5 parts by weight of cement, 1 to 2 parts by weight of long-acting slow-release compound fertilizer, and 6 to 7 parts by weight of organic fertilizer are fully mixed in a mixer to obtain a mixture 2; (3) stirring the mixed solution 1 with the mixture 2 by spraying to obtain a spray-mixed vegetation substrate A1; (4) spraying the spray-mixed vegetation substrate A1 obtained in step 3 onto the slope surface to form a certain thickness; (5) The cement content in step 2 is halved, the content of other materials remains unchanged and mixed with plant seeds to form substrate A2; (6) Spraying the substrate A2 of step 5 onto the slope surface sprayed with the spray-mixed vegetation substrate A1 of step 4 to form a certain thickness; (7) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0026] (8) Preferably, in step 4, the prepared spray-mixed vegetation substrate A1 is sprayed onto the slope surface to form a thickness of 7-9 cm.

[0027] (9) Preferably, in step 5, the prepared spray-mixed vegetation substrate mixture A2 is sprayed onto the slope surface of the substrate A1 to form a thickness of 1.5 to 3 cm.

[0028] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0029] Example 1 The present invention provides a spray-mixed planting substrate, which is prepared from the following raw materials: 100 kg of planting soil, the particle size of the planting soil is less than 2 mm; 3 kg of cement; 0.3 kg of nano-silicon dioxide, 0.15 kg of carboxylated cellulose nanofibers, the particle size of the nano-silicon dioxide is in the range of 35 to 50 nanometers, the length of the carboxylated cellulose nanofibers is 35 to 80 nm, 7 kg of organic fertilizer; 2 kg of long-acting slow-release compound fertilizer; 0.035 kg of plant seeds, in which the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate are added in a weight ratio of 1.1:1:1.5:1.3, and the particle size of the large-particle urea is greater than 2 mm; The method for preparing the spray-mixed vegetation concrete substrate comprises the following steps: (1) 0.3 kg of nano-silicon dioxide and 0.15 kg of carboxylated cellulose nanofibers were dispersed in deionized water and dispersed on an ultrasonic disperser for 2 hours to obtain a nano-material mixed solution of 1; (2) 100 kg of planting soil, 3 kg of cement, 2 kg of long-acting slow-release compound fertilizer, and 7 kg of organic fertilizer were fully mixed in a mixer to obtain a mixture 1; (3) stirring the mixed solution 1 with the mixture 1 by spraying to obtain a spray-mixed vegetation substrate A1; (4) Spraying the spray-mixed vegetation substrate A1 obtained in step 3 onto the slope surface to form a base layer with a thickness of 7 cm; (5) The cement content in step 2 is halved, the content of other materials remains unchanged and mixed with plant seeds to form substrate A2; (6) Spray A2 from step 5 onto the slope to form a surface layer with a certain thickness of 3 cm; (7) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0030] Example 2 The present invention provides a spray-mixed vegetation substrate, which is prepared from the following raw materials: 110 kg of planting soil, the particle size of the planting soil is less than 2 mm; 4 kg of cement; 0.5 kg of nano-silicon dioxide, 0.20 kg of carboxylated cellulose nanofibers, the particle size of the nano-silicon dioxide is 35-50 nanometers, the length of the carboxylated cellulose nanofibers is 35-80 nm, 6.5 kg of organic fertilizer; 1.5 kg of long-acting slow-release compound fertilizer; 0.03 kg of plant seeds. In the long-acting slow-release compound fertilizer, the addition ratio of the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate is 1.2:1:1.4:1.4 by weight, and the particle size of the large-particle urea is greater than 2 mm; The method for preparing the spray-mixed vegetation concrete substrate comprises the following steps: (1) 0.5 kg of nano-silicon dioxide and 0.20 kg of carboxylated cellulose nanofibers were dispersed in deionized water and dispersed on an ultrasonic disperser for 2 hours to obtain a nano-material mixed solution of 1; (2) 110 kg of planting soil, 4 kg of cement, 1.5 kg of long-acting slow-release compound fertilizer, and 6.5 kg of organic fertilizer were fully mixed in a mixer to obtain a mixture 1; (3) stirring the mixed solution 1 with the mixture 1 by spraying to obtain a spray-mixed vegetation substrate A1; (4) Spraying the spray-mixed vegetation substrate A1 obtained in step 3 onto the slope surface to form a base layer with a thickness of 8 cm; (5) Reduce the cement content in step 2 by half, keep the other materials unchanged and mix with 0.03 kg of plant seeds to form substrate A2; (6) Spraying the substrate A2 of step 5 onto the slope of step 4 to form a surface layer with a certain thickness of 1.5 cm; (7) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0031] Example 3 The present invention provides a spray-mixed planting substrate, which is prepared from the following raw materials: 120 kg of planting soil, the particle size of the planting soil is less than 2 mm; 5 kg of cement; 0.7 kg of nano-silicon dioxide, 0.35 kg of carboxylated cellulose nanofiber, the particle size of the nano-silicon dioxide is 35-50 nanometers, the length of the nano-cellulose is 35-80 nm, 6 kg of organic fertilizer; 1 kg of long-acting slow-release compound fertilizer; 0.5 kg of plant seeds, in which the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate are added in a weight ratio of 1.15:1:1.6:1.3, and the particle size of the large-particle urea is greater than 2 mm; The method for preparing the spray-mixed vegetation concrete substrate comprises the following steps: (1) 0.7 kg of nano-silicon dioxide and 0.35 kg of carboxylated cellulose nanofibers were dispersed in deionized water and dispersed on an ultrasonic disperser for 2 hours to obtain a nano-material mixed solution of 1; (2) 120 kg of planting soil, 5 kg of cement, 1 kg of long-acting slow-release compound fertilizer, and 6 kg of organic fertilizer were fully mixed in a mixer to obtain a mixture 1; (3) stirring the mixed solution 1 with the mixture 1 by spraying to obtain a spray-mixed vegetation substrate A1; (4) Spraying the spray-mixed vegetation substrate A1 obtained in step 3 onto the slope surface to form a base layer with a thickness of 9 cm; (5) Reduce the cement content in step 2 by half, keep the other materials unchanged and mix with 0.5 kg of plant seeds to form substrate A2; (6) Spray A2 from step 5 onto the slope surface of step 4 to form a surface layer with a certain thickness of 2 cm; (7) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0032] Example 4 The present invention provides a spray-mixed planting substrate, which is prepared from the following raw materials: 100 kg of planting soil, the particle size of the planting soil is less than 2 mm; 4 kg of cement; 0.6 kg of nano-silicon dioxide, 0.2 g of carboxylated cellulose nanofiber, the particle size of the nano-silicon dioxide is 35-50 nm, the length of the nano-cellulose is 35-80 nm, 7 kg of organic fertilizer; 2 kg of long-acting slow-release compound fertilizer; 0.2 kg of plant seeds, in which the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate are added in a weight ratio of 1.2:1:1.4:1.3, and the particle size of the large-particle urea is greater than 2 mm; The method for preparing the spray-mixed vegetation concrete substrate comprises the following steps: (1) 0.6 kg of nano-silicon dioxide and 0.2 kg of carboxylated cellulose nanofibers were dispersed in deionized water and dispersed on an ultrasonic disperser for 2 hours to obtain a nano-material mixed solution of 1; (2) 100 kg of planting soil, 4 kg of cement, 2 kg of long-acting slow-release compound fertilizer, and 7 kg of organic fertilizer were fully mixed in a mixer to obtain a mixture 1; (3) stirring the mixed solution 1 with the mixture 1 by spraying to obtain a spray-mixed vegetation substrate A1; (4) Spraying the spray-mixed vegetation substrate A1 obtained in step 3 onto the slope surface to form a base layer with a thickness of 7 cm; (5) The cement content in step 2 is halved, the content of other materials remains unchanged and mixed with plant seeds to form substrate A2; (6) Spraying the substrate A2 of step 5 onto the slope of step 4 to form a surface layer with a certain thickness of 1.5 cm; (7) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0033] In order to further verify the technical effect of the spray-mixed vegetation substrate described in this application, the following comparative cases are set for comparative verification: Comparative Example 1 A conventional planting substrate is provided, which is prepared from the following raw materials: 100 kg of planting soil, the particle size of which is less than 2 mm; 6 kg of cement; 7 kg of organic fertilizer; 2 kg of long-acting slow-release compound fertilizer; and 0.035 kg of plant seeds. In the long-acting slow-release compound fertilizer, the addition ratio of the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate is 1.1:1:1.5:1.3 by weight, and the particle size of the large-particle urea is greater than 2 mm. The method for preparing the conventional planting substrate comprises the following steps: (1) 100 kg of planting soil, 6 kg of cement, 2 kg of long-acting slow-release compound fertilizer, and 7 kg of organic fertilizer were fully mixed in a mixer to obtain a mixture A1; (2) Spraying the vegetation substrate A1 obtained in step 1 onto the slope surface to form a base layer with a thickness of 7 cm; (3) The cement content in step 1 is halved, the content of other materials remains unchanged and mixed with plant seeds to form substrate A2; (4) Spray A2 from step 3 onto the slope to form a surface layer with a certain thickness of 3 cm; (5) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0034] Comparative Example 2 A planting substrate without cement as a cementitious material is provided, and the substrate is prepared from the following raw materials: 100 kg of planting soil, the particle size of the planting soil is less than 2 mm; 1 kg of polyacrylamide; 7 kg of organic fertilizer; 2 kg of long-acting slow-release compound fertilizer; and 0.035 kg of plant seeds. In the long-acting slow-release compound fertilizer, the addition ratio of the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate is 1.1:1:1.5:1.3 by weight, and the particle size of the large-particle urea is greater than 2 mm; The polyacrylamide is an anionic, water-soluble high molecular polymer, implemented in accordance with standard GB / T 17514-2017, and has a molecular weight of 20 million.

[0035] The method for preparing the conventional planting substrate comprises the following steps: (1) 100 kg of planting soil, 1 kg of polyacrylamide, 2 kg of long-acting slow-release compound fertilizer, and 7 kg of organic fertilizer were fully mixed in a mixer to obtain a mixture A1; (2) Spraying the vegetation substrate A1 obtained in step 1 onto the slope surface to form a vegetation layer with a thickness of 9 cm; (3) Cover the slope surface with non-woven fabric for moisture conservation and maintenance.

[0036] The above substrates are divided into two parts for verification, indoor and outdoor. The outdoor part is used for excavation of slopes for construction of a power grid in a certain area, and the indoor part is used to simulate drought conditions (water content is 45% to 50% of field water holding capacity) to verify the plant growth of each substrate. During field construction, the spray-mixed vegetation substrate is laid on the slope. During the 180-day growth cycle, the plant growth parameter indicators and slope compressive strength, pH value, and nutrient indicators on the implementation sample plots laid with the substrates in Example 1 and Comparative Examples 1 and 2 are monitored. Indoors, the growth and physiological conditions of plants under drought conditions for 15 days are monitored.

[0037] The field monitoring results are shown in the following table:

[0038] In the three implementation cases, it can be seen from the unconfined compressive strength index that when pure cement is used as the cementitious material, its value is the largest. Although the unconfined compressive strength in Example 1 is lower than that in Comparative Example 1, it has a better effect than that in Comparative Example 2; from the vegetation coverage and biomass after 180 days, it can be seen that the present implementation case has a good improvement effect, which is increased by 14.3% and 41.9% or more compared with Comparative Example 1, and increased by 9.5% and 18.57% compared with Comparative Example 2; from the physical and chemical properties of each substrate after 180 days, it can be seen that the pH value of the substrate with pure cement as the cementitious material is the largest, and Example 1 is 8.5% lower than that of Comparative Example 1. Among the three nutrient indicators of organic matter, available phosphorus and available potassium, Example 1 is increased by 21%, 23.8% and 66.4% or more respectively than that of Comparative Example 1, and increased by 8.3%, 15.1% and 35.4% compared with Comparative Example 2.

[0039] The indoor monitoring results are shown in the following table:

[0040] Based on indoor experiments, the growth and physiological indicators of plants under drought conditions in the three implementation cases were measured. From the plant growth parameters, it can be seen that the absolute growth rate and biomass of Example 1 are the lowest, indicating that the addition of cement will lead to poor plant growth ability. After the present invention replaces cement with part of the nanomaterial, the plant growth effect is good, which is higher than the two comparison examples; from the physiological indicators of the plants in each implementation case, it can be seen that the method provided by the present invention can effectively reduce the damage caused by drought to plants, and the values ​​of various physiological indicators are higher than those of Example 1, and only the catalase content and soluble protein are lower than those of Example 2.

[0041] Combined with the field and indoor verification tests, it is shown that the key to whether the vegetation substrate can achieve effective slope regreening lies in balancing the relationship between the substrate mechanics and the vegetation performance. Compared with comparative examples 1 and 2, the spray-mixed vegetation substrate doped with nanomaterials and the preparation method thereof described in the present invention can improve the vegetation restoration effect under drought conditions while ensuring the relative stability of the substrate, and promote the succession of vegetation and soil in the normal direction.

[0042] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any ordinary technician in the industry can smoothly implement the present invention as shown in the drawings and described above. However, any equivalent changes, modifications and evolutions made by technicians familiar with the profession without departing from the scope of the technical solution of the present invention using the technical content disclosed above are all equivalent embodiments of the present invention. At the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention are still within the protection scope of the technical solution of the present invention.

Claims

1. A spray-mixed vegetation substrate doped with nanomaterials, characterized in that: The components include by weight: Planting soil, 100-120 parts by weight; Cement, 3-5 parts by weight; Nano silicon dioxide, 0.3-0.7 parts by weight; Carboxylated cellulose nanofibers, 0.15 to 0.35 parts by weight; Long-acting slow-release compound fertilizer, 1 to 2 parts by weight; Organic fertilizer, 6-7 parts by weight; Plant seeds, 0.03-0.5 parts by weight.

2. The spray-mixed vegetation substrate doped with nanomaterials according to claim 1, characterized in that: The long-acting slow-release compound fertilizer is prepared by mixing large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate.

3. The spray-mixed vegetation substrate doped with nanomaterials according to claim 1, characterized in that: The addition ratio of the large-particle urea, polyurethane-coated urea, potassium sulfate and diammonium phosphate is (1.1-1.2):1:(1.4-1.6):(1.3-1.4) by weight.

4. The spray-mixed vegetation substrate doped with nanomaterials according to claim 1, characterized in that: The particle size of the planting soil is less than 2 mm, and the water content of the planting soil is less than or equal to 20%.

5. The spray-mixed vegetation substrate doped with nanomaterials according to claim 1, characterized in that: The particle size of the nano silicon dioxide is 35-50 nanometers, and the length of the carboxylated cellulose nanofiber is 35-80 nm.

6. The spray-mixed vegetation substrate doped with nanomaterials according to claim 1, characterized in that: The organic fertilizer is sheep manure.

7. The method for preparing a spray-mixed vegetation substrate doped with nanomaterials as claimed in claim 1, characterized in that: include, S1, dispersing 0.3-0.7 parts by weight of nano-silicon dioxide and 0.15-0.35 parts by weight of carboxylated cellulose nanofibers in deionized water to obtain a mixed solution 1; S2, mixing 100-120 parts by weight of planting soil, 3-5 parts by weight of cement, 1-2 parts by weight of long-acting slow-release compound fertilizer and 6-7 parts by weight of organic fertilizer to obtain a mixture 2; S3, the mixed solution 1 is mixed and stirred with the mixture 2 by spraying to obtain a spray-mixed vegetation substrate A1, and the spray-mixed vegetation substrate S1 is sprayed onto the slope surface; S4, reducing the cement content in S2 by half, keeping the contents of other components unchanged, and mixing with 0.03-0.5 parts by weight of plant seeds to obtain plant seed substrate A2; spraying the plant seed substrate A2 onto the slope surface sprayed with the spray-mixed vegetation substrate A1 in S3, and after the spraying is completed, covering the slope surface with non-woven fabric for moisture conservation and maintenance.

8. The method for preparing a spray-mixed vegetation substrate doped with nanomaterials according to claim 7, characterized in that: The thickness of the spray-mixed vegetation substrate S1 sprayed onto the slope surface is 7-9 cm.

9. The method for preparing a spray-mixed vegetation substrate doped with nanomaterials according to claim 7, characterized in that: The thickness of the plant seed substrate A2 sprayed onto the slope surface sprayed with the spray-mixed vegetation substrate A1 in S3 is 1.5-3 cm.

10. The method for preparing a spray-mixed vegetation substrate doped with nanomaterials according to claim 7, characterized in that: The dispersion time of S1 is 2 hours.

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