Composition for promoting growth of mangrove plants in high-salinity mud flat and application of composition

Abstract

The invention discloses a composition for promoting growth of mangrove plants in a high-salinity mud flat and application, and relates to the field of ecological restoration. The composition comprises a slow-release composition A, a slow-release composition B, a microbial preparation and a porous adsorption material, each of the slow-release composition A and the slow-release composition B comprises a basic nutrient layer, a PU hydrogel film layer and a solid powder coating layer; wherein the difference between the sustained-release composition A and the sustained-release composition B is that the PU hydrogel film layer is different. The slow-release composition A and the slow-release composition B which are prepared from two specific raw materials and have different release speeds are matched with the microbial preparation and the porous adsorption material, so that growth of mangrove plants in a seedling raising stage and a transplanting stage can be effectively promoted, and the problem of root burning of the mangrove plants in a high-salt environment is solved; and the survival rate of mangrove plants in a high-salt environment is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ecological restoration, in particular to a composition for promoting the growth of high-salinity beach mangrove plants and application thereof. BACKGROUND

[0002] Due to the high soil salt content, high conductivity and poor soil environment of high-salinity beaches, it is difficult to meet the nutrient and root growth conditions required for the growth of mangrove plants, resulting in low survival rate and slow growth of mangrove plants after transplantation, which seriously restricts the mangrove restoration technology on beaches. Therefore, it is urgent to explore new technologies for high-salinity beach mangrove restoration. SUMMARY

[0003] In order to improve the problems of low survival rate and slow growth of existing mangrove plants transplanted to high-salinity beaches, the present application provides a composition for promoting the growth of high-salinity beach mangrove plants and application thereof.

[0004] In a first aspect, the present application provides a composition for promoting the growth of high-salinity beach mangrove plants, which adopts the following technical solution: A composition for promoting the growth of high-salinity beach mangrove plants, comprising a slow-release composition A, a slow-release composition B, a microbial preparation and a porous adsorption material; the slow-release composition A and the slow-release composition B each comprise a basic nutrient layer, a PU hydrogel film layer and a solid powder coating layer; wherein the difference between the slow-release composition A and the slow-release composition B lies in the PU hydrogel film layer; The raw materials of the PU hydrogel film layer in the slow-release composition A include isocyanate-terminated polyurethane prepolymer A, hydrophilic chain extender A and water A; the molar ratio of the isocyanate-terminated polyurethane prepolymer A to the hydrophilic chain extender A is 1:(1-1.1), and the amount of water A is 0.01-0.02% of the total weight of the isocyanate-terminated polyurethane prepolymer A; The raw materials of the PU hydrogel film layer in the slow-release composition B include isocyanate-terminated polyurethane prepolymer B, hydrophilic chain extender B and water B; the molar ratio of the isocyanate-terminated polyurethane prepolymer B to the hydrophilic chain extender B is 1:(1.3-1.5), and the amount of water B is 0.01-0.02% of the total weight of the isocyanate-terminated polyurethane prepolymer B; The isocyanate-terminated polyurethane prepolymer A is obtained by reacting polyethylene glycol with an excess of diisocyanate component; and the isocyanate-terminated polyurethane prepolymer B is obtained by reacting polyethylene glycol, long-chain alkyl glycol and an excess of diisocyanate component.

[0005] In the present application, the composition for promoting the growth of high-salinity tidal flat mangrove plants includes slow-release composition A, slow-release composition B, microbial preparation, and porous adsorption material. Slow-release composition A and slow-release composition B are used to provide nutrients for mangrove plants and promote the growth of mangrove plants. The microbial preparation is used to improve the soil environment of the tidal flat and promote the growth of the plant root system. The porous adsorption material is used to adsorb salt ions, reduce soil conductivity, and help prevent the problem of easy root burning of mangrove plants in high-salt conditions. In addition, the porous adsorption material can also provide an attachment interface for the microbial preparation, prolonging the activity of the microbial preparation.

[0006] In the present application, the difference between slow-release composition A and slow-release composition B lies in the hydrophilic and hydrophobic properties and the cross-linking degree of the PU hydrogel film layer. Slow-release composition A has higher hydrophilicity and lower cross-linking degree than slow-release composition B. Therefore, compared with slow-release composition B, slow-release composition A is relatively easy to release nutrients. The addition of an appropriate amount of slow-release composition A is beneficial to shorten the seedling time of mangrove plants. Slow-release composition B mainly plays a long-term slow-release role and is responsible for the sustained nutrient supply after mangrove plant transplantation, improving the survival rate and growth rate of mangrove plants. However, in the environment with high soil salinity, the PU hydrogel film layer of both slow-release composition A and slow-release composition B will have a smaller pore size due to the compression of the double electric layer, automatically slowing down water penetration, thereby automatically slowing down the release of nutrients, preventing the problem of root burning, and improving the survival rate of mangrove plants.

[0007] In addition, slow-release composition A and slow-release composition B of the present application also respectively include a solid powder coating layer, which can improve the adhesion problem between the slow-release compositions, facilitate the uniform dispersion of slow-release composition A / B, and prevent the problem of excessive local concentration.

[0008] That is, the slow-release composition A and slow-release composition B with different release speeds prepared by two specific raw materials, microbial preparation, and porous adsorption material can effectively promote the growth of mangrove plants during the seedling stage and the transplantation stage, improve the problem of root burning of mangrove plants in high-salt environments, and improve the survival rate of mangrove plants in high-salt environments.

[0009] In some specific embodiments, the hydrophilic chain extender A and the hydrophilic chain extender B respectively include small molecule diol, small molecule diamine, and dimethylol propionic acid. The molar ratio of small molecule diol, small molecule diamine, and dimethylol propionic acid is 1:(0.5-1):(3-3.5).

[0010] In the present application, the hydrophilic chain extender A and the hydrophilic chain extender B respectively adopt the composition of small molecule diol, small molecule diamine and dimethylol propionic acid. The introduction of a small amount of small molecule diol and small molecule diamine can give the PU hydrogel film layer a certain strength, prevent the PU hydrogel film layer from being broken under pressure during storage, and thus affect the slow release effect. In addition, a higher proportion of dimethylol propionic acid is beneficial to improve the hydrophilicity of the PU hydrogel film, and is beneficial to the penetration of water molecules and the dissolution of nutrient ingredients.

[0011] In some specific embodiments, the molar ratio of polyethylene glycol to diisocyanate component in the isocyanate-terminated polyurethane prepolymer A is 1:(1.05-1.1); the molar ratio of polyethylene glycol, long-chain alkyl glycol and diisocyanate component in the isocyanate-terminated polyurethane prepolymer B is (0.8-0.9):(0.1-0.2):(1.05-1.15), and the long-chain alkyl glycol adopts alkyl glycol with a carbon atom number of 10-18.

[0012] In the present application, the isocyanate-terminated polyurethane prepolymer A does not introduce a hydrophobic long-chain alkyl group, which can relatively accelerate the release of nutrient ingredients in the slow-release composition A and is beneficial to promote the growth of seedlings. In the isocyanate-terminated polyurethane prepolymer B, a proper amount of long-chain alkyl glycol is introduced, which can improve the tensile strength and elasticity of the PU hydrogel film layer, prevent the PU hydrogel film layer from being damaged due to too fast swelling, and is beneficial to the slow release of nutrient ingredients and promote the rapid growth of plants after transplanting.

[0013] In some specific embodiments, the base nutrient layer comprises nitrogen fertilizer, potassium fertilizer, phosphorus fertilizer and polyvinyl alcohol aqueous solution with a mass concentration of 1.5-3%, and the mass ratio of nitrogen fertilizer, potassium fertilizer, phosphorus fertilizer and polyvinyl alcohol aqueous solution with a mass concentration of 1.5-3% is (5-10):(10-15):(10-15):(8-12), and the solid powder coating layer comprises at least one of diatomite, kaolin, mica powder and talc powder.

[0014] In some specific embodiments, the nitrogen fertilizer adopts at least one of urea and ammonium nitrate, the potassium fertilizer adopts at least one of potassium chloride and potassium sulfate, and the phosphorus fertilizer adopts at least one of monoammonium phosphate and diammonium phosphate.

[0015] In some specific embodiments, the preparation method of the slow-release composition A / slow-release composition B comprises the following steps: S1, uniformly mixing nitrogen fertilizer, potassium fertilizer, phosphorus fertilizer and water-soluble binder, and then granulating to obtain a base nutrient layer; S2, dissolving the isocyanate-terminated polyurethane prepolymer A / isocyanate-terminated polyurethane prepolymer B in a solvent, then uniformly spraying on the surface of the base nutrient layer, then spraying the aqueous solution of the hydrophilic chain extender A / B, after cross-linking reaction, removing the residual solvent, thereby forming a PU hydrogel film layer on the surface of the base nutrient layer; S3, heating the product of S2 to 50-60℃, then spraying solid powder in a fluidized bed or a rotating drum, uniformly coating the solid powder on the surface of the PU hydrogel film layer, thereby forming a solid powder coating layer on the surface of the PU hydrogel film layer.

[0016] The application adopts the above method to prepare the slow-release composition A and the slow-release composition B, which is beneficial to obtain the slow-release composition A and B with uniform particle size and stable coating effect.

[0017] In some specific embodiments, the microbial preparation includes salt-tolerant Pseudomonas and salt-tolerant Streptomyces, and the weight ratio of the salt-tolerant Pseudomonas and the salt-tolerant Streptomyces is 1:(1-1.5).

[0018] In some specific embodiments, the porous adsorption material adopts biochar with a porosity of 60-80%.

[0019] Biochar with high porosity has strong adsorption capacity for salt ions, which is beneficial to reduce the conductivity of high-salinity tidal flats and protect the root system of mangrove plants.

[0020] In some specific embodiments, the weight ratio of the slow-release composition A, the slow-release composition B, the microbial preparation, and the porous adsorption material is 1:(3-4):(0.1-0.2):(40-50).

[0021] In a second aspect, the application provides a nutrient bag for promoting the growth of mangrove plants in high-salinity tidal flats, which adopts the following technical solution: A nutrient bag for promoting the growth of mangrove plants in high-salinity tidal flats, comprising soil and a composition for promoting the growth of mangrove plants in high-salinity tidal flats as described in any one of the above, and the weight ratio of the soil and the composition for promoting the growth of mangrove plants in high-salinity tidal flats is 100:(30-40).

[0022] In some specific embodiments, the salinity of the soil is 0.6-3%.

[0023] The nutrient bag of the application can promote the growth of mangrove plants in high-salinity tidal flats, prevent the problem of root burning of mangrove plants, and improve the survival rate of mangrove plants in high-salinity tidal flats.

[0024] In summary, the application at least includes the following beneficial technical effects: (1) The slow-release composition A and the slow-release composition B with different release speeds prepared by two specific raw materials, the microbial preparation, and the porous adsorption material can effectively promote the growth of the mangrove plant in the seedling stage and the transplanting stage, improve the root burning problem of the mangrove plant in the high-salt environment, and improve the survival rate of the mangrove plant in the high-salt environment.

[0025] (2) In the present application, the hydrophilic chain extender A and the hydrophilic chain extender B respectively adopt the composition of small molecule diol, small molecule diamine, and dimethylol propionic acid. The introduction of a small amount of small molecule diol and small molecule diamine can give the PU hydrogel film layer a certain strength, prevent the PU hydrogel film layer from being broken under pressure during storage, and thus affect the slow-release effect. In addition, a higher proportion of dimethylol propionic acid is beneficial to improving the hydrophilicity of the PU hydrogel film, facilitating the penetration of water molecules and the dissolution of nutrient ingredients.

[0026] (3) In the present application, the isocyanate-terminated polyurethane prepolymer A does not introduce a hydrophobic long-chain alkyl group, which can relatively accelerate the release of nutrient ingredients in the slow-release composition A, and is beneficial to promoting the growth of seedlings. In the isocyanate-terminated polyurethane prepolymer B, an appropriate amount of long-chain alkyl diol is introduced, which can improve the tensile strength and elasticity of the PU hydrogel film layer, prevent the PU hydrogel film layer from being damaged due to too fast swelling, and is beneficial to the slow release of nutrient ingredients and the rapid growth of plants after transplantation. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 is a structural schematic diagram of the slow-release composition A / B.

[0028] BRIEF DESCRIPTION OF DRAWINGS 1, base nutrient layer; 2, PU hydrogel film layer; 3, solid powder coating layer. DETAILED DESCRIPTION

[0029] The present application will be further described below in combination with specific experiments.

[0030] Preparation example of slow-release composition A

Preparation example 1-1

[0031] [Preparation Example 1-2] A slow-release composition A includes a base nutrient layer, a PU hydrogel film layer, and a solid powder coating layer, and the preparation method includes the following steps: S1, 10 kg of urea, 10 kg of potassium sulfate, 10 kg of diammonium phosphate, and 8 kg of a polyvinyl alcohol aqueous solution with a mass concentration of 2% are uniformly mixed, and then granulated to obtain a base nutrient layer; S2, 1 kmol of isocyanate-terminated polyurethane prepolymer A (obtained by reacting 1 kmol of polyethylene glycol with a number average molecular weight of 1000 with 1.1 kmol of isophorone diisocyanate at 75°C for 3 hours) is dissolved in 5 kmol of acetone, and then uniformly sprayed on the surface of the base nutrient layer, followed by spraying a mixed solution of hydrophilic chain extender A and water A (the amount of hydrophilic chain extender A is 1.1 kmol, and the hydrophilic chain extender A includes ethylene glycol, ethylenediamine, and dimethylol propionic acid, and the molar ratio of ethylene glycol, ethylenediamine, and dimethylol propionic acid is 1:1:3; the amount of water A is 0.02% of the total weight of isocyanate-terminated polyurethane prepolymer A), and after cross-linking reaction, the residual acetone is removed, thereby forming a PU hydrogel film layer on the surface of the base nutrient layer; S3, the product of S2 is warmed to 60°C, and then 1 kg of talc powder is sprayed in a fluidized bed to uniformly coat the PU hydrogel film layer, thereby forming a solid powder coating layer on the surface of the PU hydrogel film layer.

[0032] [Preparation Example 1-3] A slow-release composition A differs from

Preparation Example 1-1

[0033] Preparation Example 1-4 A slow-release composition A, which is different from Preparation Example 1-1 in that the total amount of the hydrophilic chain extender A is 1.5 kmol.

[0034] Preparation Example 1-5 A slow-release composition A, which is different from Preparation Example 1-1 in that the amount of water A is 0.1% of the total weight of the isocyanate-terminated polyurethane prepolymer A.

[0035] Preparation Example of slow-release composition B Preparation Example 2-1 A slow-release composition B, comprising a base nutrient layer, a PU hydrogel film layer and a solid powder coating layer, and the preparation method comprises the following steps: S1, 5 kg of urea, 15 kg of potassium sulfate, 15 kg of diammonium phosphate and 12 kg of polyvinyl alcohol aqueous solution with a mass concentration of 2% are uniformly mixed, granulated, and a base nutrient layer is obtained; S2, 1 kmol of isocyanate-terminated polyurethane prepolymer B (obtained by reacting 0.8 kmol of polyethylene glycol with a number average molecular weight of 1000, 0.2 kmol of 1,2-dodecanediol and 1.05 kmol of isophorone diisocyanate at 75°C for 3h) is dissolved in 5 kmol of acetone, then uniformly sprayed on the surface of the base nutrient layer, then a mixed solution of hydrophilic chain extender B and water B (the amount of hydrophilic chain extender B is 1.3 kmol, and the hydrophilic chain extender B comprises ethylene glycol, ethylenediamine and dimethylol propionic acid, and the molar ratio of ethylene glycol, ethylenediamine and dimethylol propionic acid is 1:0.5:3.5; the amount of water B is 0.01% of the total weight of the isocyanate-terminated polyurethane prepolymer B), and after cross-linking reaction, the residual acetone is removed, thereby forming a PU hydrogel film layer on the surface of the base nutrient layer; S3, the product of S2 is heated to 50°C, then 1 kg of talc powder is sprayed in the fluidized bed, and the talc powder is uniformly coated on the surface of the PU hydrogel film layer, thereby forming a solid powder coating layer on the surface of the PU hydrogel film layer.

[0036] Preparation Example 2-2 A slow-release composition B, comprising a base nutrient layer, a PU hydrogel film layer and a solid powder coating layer, and the preparation method comprises the following steps: S1, 10 kg of urea, 10 kg of potassium sulfate, 10 kg of diammonium phosphate and 8 kg of polyvinyl alcohol aqueous solution with a mass concentration of 2% are uniformly mixed, granulated, and a base nutrient layer is obtained; S2, 1 kmol of isocyanate-terminated polyurethane prepolymer B (obtained by reacting 0.9 kmol of polyethylene glycol with a number average molecular weight of 1000, 0.1 kmol of 1,2-dodecanediol, and 1.15 kmol of isophorone diisocyanate at 75 °C for 3 h) is dissolved in 5 kmol of acetone, and then uniformly sprayed onto the surface of the base nutrient layer, followed by spraying a mixed solution of hydrophilic chain extender B and water B (the amount of hydrophilic chain extender B is 1.5 kmol, the hydrophilic chain extender B includes ethylene glycol, ethylenediamine, and dimethylol propionic acid, and the molar ratio of ethylene glycol, ethylenediamine, and dimethylol propionic acid is 1:1:3; the amount of water B is 0.02% of the total weight of isocyanate-terminated polyurethane prepolymer B), and after cross-linking reaction, the residual acetone is removed, thereby forming a PU hydrogel film layer on the surface of the base nutrient layer; S3, the product of S2 is warmed to 60 °C, and then 1 kg of talc powder is sprayed into a fluidized bed to uniformly coat the PU hydrogel film layer, thereby forming a solid powder coating layer on the surface of the PU hydrogel film layer.

[0037]

Preparation Example 2-3

Preparation Example 2-1

[0038]

Preparation Example 2-4

Preparation Example 2-1

[0039]

Preparation Example 2-5

Preparation Example 2-1

[0040]

Example 1

Preparation Example 1-1

Preparation Example 2-1

[0041]

Example 2

Preparation Example 1-2

Preparation Example 2-2

[0042] Comparative Example

Comparative Example 1

Example 1

Preparation Example 1-3

[0043]

Comparative Example 2

Example 1

Preparation Example 1-4

[0044]

Comparative Example 3

Example 1

Preparation Example 1-5

[0045]

Comparative Example 4

Example 1

Preparation Example 2-3

[0046]

Comparative Example 5

Example 1

Preparation Example 2-4

[0047]

Comparative Example 6

Example 1

Preparation Example 2-5

[0048]

Comparative Example 7

Example 1

Preparation Example 1-1

Preparation Example 2-1

[0049]

Comparative Example 8

Example 1

Preparation Example 2-1

Preparation Example 1-1

[0050] Performance test The soil with salinity (measured by salinity after the soil sample is sieved, mixed with soil-water ratio 1:5, and centrifuged) of 0.6%, 1.5%, and 3% and the composition in each example and comparative example are mixed at a weight ratio of 100:35, then loaded into a degradable bag to prepare a nutrient bag, which is used to cultivate the seedlings of Suaeda salsa. The height of the seedlings of Suaeda salsa is 20-25 cm. Each nutrient bag is used as a test sample with 50 seedlings of Suaeda salsa. The survival rate and growth promoting effect of different nutrient bags on Suaeda salsa under different salinity (represented by the average height increase value of the survival samples) are tested under the same fresh water irrigation condition. The cultivation period is 30 days. Then, the Suaeda salsa is transplanted into the same beach soil (the salinity of the beach soil is 2.5-3.0%) with the bag. The beach soil is regularly irrigated with fresh water. After 60 days of transplantation, the survival rate and average height increase value of the seedlings of Suaeda salsa after transplantation are recorded.

[0051] Table 1 Table 2 According to the test data of Example 1 and Example 2 and Table 1-Table 2, it can be known that the slow-release composition A and the slow-release composition B with different release speeds prepared by two specific raw materials, the microbial preparation, and the porous adsorption material can effectively promote the growth of Suaeda salsa in the seedling stage and the transplantation stage, improve the root burning problem of Suaeda salsa in the high-salt environment, and improve the survival rate of Suaeda salsa in the high-salt environment.

[0052] According to the test data of Example 1 and Comparative Example 1-3 and Table 1-Table 2, it can be known that the composition, amount of hydrophilic chain extender A, and amount of water A in the slow-release composition A affect the survival rate and growth speed of Suaeda salsa in the seedling stage and the transplantation stage.

[0053] According to the test data of Example 1 and Comparative Example 4-5 and Table 1-Table 2, it can be known that the composition and amount of hydrophilic chain extender B in the slow-release composition B affect the growth speed of Suaeda salsa in the seedling stage and the transplantation stage, and the amount of water B affects the survival rate and growth speed of Suaeda salsa in the seedling stage and the transplantation stage.

[0054] According to the test data of Example 1 and Example 7-8 and Table 1-Table 2, it can be known that when the slow-release composition A or the slow-release composition B is used alone, the survival rate and growth speed of Suaeda salsa in the seedling stage and the transplantation stage are decreased.

[0055] The specific embodiment is only an explanation of the present application, which is not a limitation of the present application. Those skilled in the art can make modifications to the specific embodiment without creative contribution after reading the present specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A composition for promoting growth of high salinity mangrove plants, characterized by: The application relates to a slow-release composition A, a slow-release composition B, a microbial preparation and a porous adsorption material; the slow-release composition A and the slow-release composition B both comprise a basic nutrient layer, a PU hydrogel film layer and a solid powder coating layer; The difference between the slow-release composition A and the slow-release composition B lies in that the PU hydrogel film layers are different, the raw materials of the PU hydrogel film layer in the slow-release composition A comprise isocyanate-terminated polyurethane prepolymer A, hydrophilic chain extender A and water A; the molar ratio of the isocyanate-terminated polyurethane prepolymer A to the hydrophilic chain extender A is 1: (1-1.1), and the amount of water A is 0.01-0.02% of the total weight of the isocyanate-terminated polyurethane prepolymer A; The raw materials of the PU hydrogel film layer in the slow-release composition B comprise isocyanate-terminated polyurethane prepolymer B, hydrophilic chain extender B and water B; the molar ratio of the isocyanate-terminated polyurethane prepolymer B to the hydrophilic chain extender B is 1: (1.3-1.5), and the amount of water B is 0.01-0.02% of the total weight of the isocyanate-terminated polyurethane prepolymer B; The isocyanate-terminated polyurethane prepolymer A is obtained by reacting polyethylene glycol with an excess of diisocyanate components; and the isocyanate-terminated polyurethane prepolymer B is obtained by reacting polyethylene glycol, long-chain alkyl glycol and an excess of diisocyanate components.

2. The composition for promoting growth of high salinity tidal marsh plants according to claim 1, characterized in that: The hydrophilic chain extender A and the hydrophilic chain extender B respectively comprise small-molecule diol, small-molecule diamine and dimethylol propionic acid, and the molar ratio of the small-molecule diol, the small-molecule diamine and the dimethylol propionic acid is 1: (0.5-1): (3-3.5).

3. The composition for promoting growth of high salinity tidal marsh plants according to claim 1, characterized in that: In the isocyanate-terminated polyurethane prepolymer A, the molar ratio of polyethylene glycol to diisocyanate components is 1: (1.05-1.1); and in the isocyanate-terminated polyurethane prepolymer B, the molar ratio of polyethylene glycol, long-chain alkyl glycol and diisocyanate components is (0.8-0.9): (0.1-0.2): (1.05-1.15), and the long-chain alkyl glycol is alkyl glycol with 10-18 carbon atoms.

4. The composition for promoting the growth of high-salinity tidal marsh plants according to any one of claims 1-3, characterized in that: The basic nutrient layer comprises nitrogen fertilizer, potassium fertilizer, phosphorus fertilizer and polyvinyl alcohol aqueous solution with a mass concentration of 1.5-3%, and the mass ratio of the nitrogen fertilizer, the potassium fertilizer, the phosphorus fertilizer and the polyvinyl alcohol aqueous solution with a mass concentration of 1.5-3% is (5-10):(10-15):(10-15):(8-12); and the solid powder coating layer comprises at least one of diatomite, kaolin, mica powder and talc powder.

5. The composition for promoting growth of high salinity tidal marsh plants according to claim 4, characterized in that: The preparation method of the slow-release composition A / slow-release composition B comprises the following steps: S1, uniformly mixing nitrogen fertilizer, potassium fertilizer, phosphorus fertilizer and water-soluble binder, granulating and obtaining a basic nutrient layer; S2, dissolving isocyanate-terminated polyurethane prepolymer A / isocyanate-terminated polyurethane prepolymer B in a solvent, uniformly spraying the isocyanate-terminated polyurethane prepolymer A / isocyanate-terminated polyurethane prepolymer B on the surface of the basic nutrient layer, then spraying hydrophilic chain extender A / hydrophilic chain extender B and water A / water B, crosslinking after reaction, and removing residual solvent, so as to form a PU hydrogel film layer on the surface of the basic nutrient layer; S3, the product of S2 is warmed to 50-60℃, then solid powder is sprayed in fluidized bed or rotary drum, the solid powder is evenly coated on the surface of PU hydrogel film layer, so as to form a solid powder coating layer on the surface of PU hydrogel film layer.

6. The composition for promoting growth of high salinity tidal marsh plants according to claim 1, characterized in that: The microbial preparation comprises salt-tolerant Pseudomonas and salt-tolerant Streptomyces, and the weight ratio of the salt-tolerant Pseudomonas and the salt-tolerant Streptomyces is 1: (1-1.5).

7. The composition for promoting growth of high salinity tidal marsh plants according to claim 1, characterized in that: The porous adsorption material adopts biochar with a porosity of 60-80%.

8. The composition for promoting growth of high salinity tidal marsh plants according to claim 1, characterized in that: The weight ratio of the slow-release composition A, the slow-release composition B, the microbial preparation, and the porous adsorption material is 1: (3-4): (0.1-0.2): (40-50).

9. A nutrient bag for promoting growth of high salinity tidal marsh mangrove plants, characterized by: The soil and the composition for promoting growth of high-salinity tidal wetland mangrove plants according to any one of claims 1-8, and the weight ratio of the tidal wetland soil and the composition for promoting growth of high-salinity tidal wetland mangrove plants is 100: (30-40).

10. The nutrient pouch for promoting the growth of high salinity tidal marsh plants according to claim 9, wherein: The salinity of the soil is 0.6-3%.

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