Method for improving soil stability of coastal wetland mangrove planting substrate

Abstract

The application discloses a method for improving the stability of a coastal wetland mangrove planting substrate soil, which comprises the following steps: taking a mangrove planting substrate soil and reserving; then stirring and adjusting the substrate soil in a sufficient amount of adjusting liquid, and then performing filtration and drying; preparing a chitosan solution according to a weight ratio of 4:9:1 of chitosan, deionized water and a phosphate buffer solution; and fully blending and stirring 4-7 parts of modified rice husk ash, 1-3 parts of sodium humate and 2-4 parts of the chitosan solution with a mass fraction of 5% to obtain a stabilizing modifier. The stability of the mangrove planting substrate soil is improved by adjusting the substrate soil through stirring and adjusting, and then by cooperating with the stabilizing modifier prepared by blending the modified rice husk ash, the sodium humate and the chitosan solution, so that the soil can be optimized in terms of the stability of soil salinization and the stability of soil organic matter content, and the soil property stability is improved.

Description

Technical Field

[0001] This invention relates to the field of substrate soil improvement technology, specifically to a method for improving the stability of substrate soil for planting mangroves in coastal wetlands. Background Technology

[0002] Mangroves grow in the mudflats and shallows at the boundary between land and sea. They are a special ecosystem that transitions from land to sea and are the only woody plants in the current coastal wetland ecosystem. They have functions such as land reclamation, shore protection, and dike protection. They can also effectively purify seawater, protect marine ecosystems, and provide habitats for marine life, thus having enormous social, ecological, and economic benefits.

[0003] The substrate soil used for existing coastal wetland mangrove planting is prone to salinization, and the soil organic matter content deteriorates, resulting in low soil property stability, making it difficult to improve mangrove planting. Based on this, the present invention further improves the treatment. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the purpose of this invention is to provide a method for improving the soil stability of planting substrate for mangroves in coastal wetlands, so as to solve the problems mentioned in the background art.

[0005] The present invention solves the technical problem by adopting the following technical solution:

[0006] This invention provides a method for improving the soil stability of planting substrates for mangroves in coastal wetlands, comprising the following steps:

[0007] Step 1: Take the planting substrate soil from the mangrove forest and set it aside;

[0008] Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried.

[0009] Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:1. Then, mix 4-7 parts of modified rice husk ash, 1-3 parts of sodium humate and 2-4 parts of 5% chitosan solution by mass and stir thoroughly to obtain a stabilizing modifier.

[0010] Step four: Add 10-15% of the total dry soil volume of the stabilizer to the dry soil, then mix thoroughly.

[0011] Preferably, the pH value of the phosphate buffer solution is 5.5-6.0.

[0012] Preferably, the stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 30-40 min.

[0013] Preferably, the method for preparing the conditioning liquid is as follows:

[0014] S1: Heat-treat bentonite at 210-220℃ for 10-15 minutes, then cool it to room temperature at a rate of 2-4℃ / min for later use;

[0015] S2: Mix 3-6 parts of spare bentonite, 1-3 parts of nano silica sol, 2-5 parts of sodium lignosulfonate solution and 3-7 parts of sodium citrate solution thoroughly to obtain bentonite agent;

[0016] S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until homogeneous, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully homogeneous to obtain the conditioning solution.

[0017] Preferably, the sodium lignosulfonate solution has a mass fraction of 2-5%; the sodium citrate solution has a mass fraction of 10-15%.

[0018] Preferably, the hydrochloric acid solution has a mass fraction of 2%.

[0019] Preferably, the ball milling speed is 1000-1500 r / min and the ball milling time is 1-2 h.

[0020] Preferably, the modification method of the modified rice husk ash is as follows:

[0021] S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 150-160℃ at a rate of 1-3℃ / min, keep it at that temperature for 5-10min, and then lower the temperature to 55℃ at a rate of 2-5℃ / min.

[0022] S12: Mix 4-7 parts of S11 rice husk ash, 1-3 parts of silane coupling agent, 10-15 parts of sodium alginate solution, and 1-3 parts of stearic acid thoroughly, then wash with water and dry to obtain modified rice husk ash.

[0023] The inventors of this invention discovered that without conditioning solution treatment and without the addition of modified rice husk ash, the salt content and soil organic matter content of the product changed significantly. Furthermore, without the addition of dried hydroxyapatite to the conditioning solution, without the addition of spare bentonite to the conditioning solution, without the use of S11 treatment in the preparation of modified rice husk ash, and without the use of S12 treatment in the preparation of modified rice husk ash, the performance of the product tended to deteriorate. Only the conditioning solution treatment and modified rice husk ash prepared using the method of this invention resulted in the most significant performance improvement of the product.

[0024] Preferably, the silane coupling agent is silane coupling agent KH560.

[0025] Preferably, the sodium alginate solution has a mass fraction of 10-15%.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] This invention relates to the soil stability of mangrove planting substrates. The substrate soil is regulated by stirring with a conditioning solution, and then further regulated by a stabilizing modifier composed of modified rice husk ash, sodium humate, and chitosan solution. This optimizes soil salinity and organic matter content, improving soil property stability. The bentonite in the conditioning solution is first heat-treated at 210-220℃ for 10-15 minutes, then cooled to room temperature at a rate of 2-4℃ / min to optimize the interlayer spacing of the bentonite and enhance its effectiveness in the system. The mixture of nano-silica sol, sodium lignosulfonate solution, and sodium citrate solution further improves the system. Finally, the bentonite agent is synergistically formulated with hydroxyapatite to obtain the desired conditioning solution. The synergistic effect of bentonite and hydroxyapatite enhances the stability of the system. Furthermore, the addition of a stabilizing modifier, modified rice husk ash, utilizes the high specific surface area of ​​rice husk ash. This modified rice husk ash is thoroughly mixed with potassium permanganate solution, then washed and dried. The dried rice husk ash is first heated to 150-160℃ at a rate of 1-3℃ / min and held for 5-10 min, then cooled to 55℃ at a rate of 2-5℃ / min to optimize its activity and dispersibility. Further improvements are achieved through blending with silane coupling agents, sodium alginate solution, and stearic acid, further enhancing the synergistic effect between the modified rice husk ash and the conditioning solution in the system. Consequently, soil salinization and organic matter content stability are significantly improved. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to specific examples. 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.

[0029] This embodiment of a method for improving the soil stability of planting substrate for mangroves in coastal wetlands includes the following steps:

[0030] Step 1: Take the planting substrate soil from the mangrove forest and set it aside;

[0031] Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried.

[0032] Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:1. Then, mix 4-7 parts of modified rice husk ash, 1-3 parts of sodium humate and 2-4 parts of 5% chitosan solution by mass and stir thoroughly to obtain a stabilizing modifier.

[0033] Step four: Add 10-15% of the total dry soil volume of the stabilizer to the dry soil, then mix thoroughly.

[0034] The pH value of the phosphate buffer solution in this embodiment is 5.5-6.0.

[0035] In this embodiment, the stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 30-40 min.

[0036] The preparation method of the conditioning liquid in this embodiment is as follows:

[0037] S1: Heat-treat bentonite at 210-220℃ for 10-15 minutes, then cool it to room temperature at a rate of 2-4℃ / min for later use;

[0038] S2: Mix 3-6 parts of spare bentonite, 1-3 parts of nano silica sol, 2-5 parts of sodium lignosulfonate solution and 3-7 parts of sodium citrate solution thoroughly to obtain bentonite agent;

[0039] S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until homogeneous, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully homogeneous to obtain the conditioning solution.

[0040] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 2-5%; the sodium citrate solution has a mass fraction of 10-15%.

[0041] The hydrochloric acid solution in this embodiment has a mass fraction of 2%.

[0042] In this embodiment, the ball milling speed is 1000-1500 r / min, and the ball milling time is 1-2 h.

[0043] The modification method of the modified rice husk ash in this embodiment is as follows:

[0044] S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 150-160℃ at a rate of 1-3℃ / min, keep it at that temperature for 5-10min, and then lower the temperature to 55℃ at a rate of 2-5℃ / min.

[0045] S12: Mix 4-7 parts of S11 rice husk ash, 1-3 parts of silane coupling agent, 10-15 parts of sodium alginate solution, and 1-3 parts of stearic acid thoroughly, then wash with water and dry to obtain modified rice husk ash.

[0046] The silane coupling agent in this embodiment is silane coupling agent KH560.

[0047] The sodium alginate solution in this embodiment has a mass fraction of 10-15%.

[0048] Example 1.

[0049] This embodiment of a method for improving the soil stability of planting substrate for mangroves in coastal wetlands includes the following steps:

[0050] Step 1: Take the planting substrate soil from the mangrove forest and set it aside;

[0051] Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried.

[0052] Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:1. Then, mix 4 parts of modified rice husk ash, 1 part of sodium humate and 2 parts of 5% chitosan solution by mass and stir thoroughly to obtain a stabilizing modifier.

[0053] Step four: Add 10% of the total dry soil volume of the stabilizer modifier to the dry soil, and then mix thoroughly.

[0054] The pH value of the phosphate buffer solution in this embodiment is 5.5.

[0055] In this embodiment, the stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 30-40 min.

[0056] The preparation method of the conditioning liquid in this embodiment is as follows:

[0057] S1: Heat-treat the bentonite at 210℃ for 10 min, then cool it to room temperature at a rate of 2℃ / min for later use;

[0058] S2: Mix 3 parts of prepared bentonite, 1 part of nano silica sol, 2 parts of sodium lignosulfonate solution and 3 parts of sodium citrate solution thoroughly to obtain bentonite agent;

[0059] S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until homogeneous, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully homogeneous to obtain the conditioning solution.

[0060] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 2%; the sodium citrate solution has a mass fraction of 10%.

[0061] The hydrochloric acid solution in this embodiment has a mass fraction of 2%.

[0062] In this embodiment, the ball milling speed is 1000 r / min and the ball milling time is 1 h.

[0063] The modification method of the modified rice husk ash in this embodiment is as follows:

[0064] S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 150℃ at a rate of 1℃ / min, keep it at that temperature for 5min, and then lower the temperature to 55℃ at a rate of 2℃ / min.

[0065] S12: Mix 4 parts of S11 rice husk ash, 1 part of silane coupling agent, 1 part of sodium alginate solution and 1 part of stearic acid thoroughly, and finally wash and dry to obtain modified rice husk ash.

[0066] The silane coupling agent in this embodiment is silane coupling agent KH560.

[0067] The sodium alginate solution in this embodiment has a mass fraction of 10%.

[0068] Example 2.

[0069] This embodiment of a method for improving the soil stability of mangrove planting substrate includes the following steps:

[0070] Step 1: Take the planting substrate soil from the mangrove forest and set it aside;

[0071] Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried.

[0072] Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:1. Then, mix 7 parts of modified rice husk ash, 3 parts of sodium humate and 4 parts of 5% chitosan solution by mass and stir thoroughly to obtain a stabilizing modifier.

[0073] Step four: Add 10-15% of the total dry soil volume of the stabilizer to the dry soil, then mix thoroughly.

[0074] The pH value of the phosphate buffer solution in this embodiment is 6.0.

[0075] In this embodiment, the stirring speed for the stirring adjustment process is 550 r / min, and the stirring time is 40 min.

[0076] The preparation method of the conditioning liquid in this embodiment is as follows:

[0077] S1: Heat-treat the bentonite at 220℃ for 15 minutes, then cool it to room temperature at a rate of 4℃ / min for later use;

[0078] S2: Mix 6 parts of prepared bentonite, 3 parts of nano silica sol, 5 parts of sodium lignosulfonate solution and 7 parts of sodium citrate solution thoroughly to obtain bentonite agent;

[0079] S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until homogeneous, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully homogeneous to obtain the conditioning solution.

[0080] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 5%; the sodium citrate solution has a mass fraction of 15%.

[0081] The hydrochloric acid solution in this embodiment has a mass fraction of 2%.

[0082] In this embodiment, the ball milling speed is 1500 r / min and the ball milling time is 2 h.

[0083] The modification method of the modified rice husk ash in this embodiment is as follows:

[0084] S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 160℃ at a rate of 3℃ / min, keep it at that temperature for 10min, and then lower the temperature to 55℃ at a rate of 5℃ / min.

[0085] S12: Mix 7 parts of S11 rice husk ash, 3 parts of silane coupling agent, 15 parts of sodium alginate solution and 3 parts of stearic acid thoroughly, and finally wash and dry to obtain modified rice husk ash.

[0086] The silane coupling agent in this embodiment is silane coupling agent KH560.

[0087] The sodium alginate solution in this embodiment has a mass fraction of 15%.

[0088] Example 3.

[0089] This embodiment of a method for improving the soil stability of planting substrate for mangroves in coastal wetlands includes the following steps:

[0090] Step 1: Take the planting substrate soil from the mangrove forest and set it aside;

[0091] Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried.

[0092] Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:1. Then, mix 5.5 parts of modified rice husk ash, 2 parts of sodium humate and 3 parts of chitosan solution with a mass fraction of 5% with thorough stirring to obtain a stabilizing modifier.

[0093] Step four: Add 12.5% ​​of the total dry soil volume of the stabilizer to the dry soil, then mix thoroughly.

[0094] The pH value of the phosphate buffer solution in this embodiment is 5.8.

[0095] In this embodiment, the stirring speed for the stirring adjustment process is 500 r / min, and the stirring time is 35 min.

[0096] The preparation method of the conditioning liquid in this embodiment is as follows:

[0097] S1: Heat-treat the bentonite at 215℃ for 12 minutes, then cool it to room temperature at a rate of 3℃ / min for later use;

[0098] S2: Mix 4.5 parts of spare bentonite, 2 parts of nano silica sol, 3.5 parts of sodium lignosulfonate solution and 5 parts of sodium citrate solution thoroughly to obtain bentonite agent;

[0099] S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until homogeneous, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully homogeneous to obtain the conditioning solution.

[0100] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 3.5%; the sodium citrate solution has a mass fraction of 12.5%.

[0101] The hydrochloric acid solution in this embodiment has a mass fraction of 2%.

[0102] In this embodiment, the ball milling speed is 1250 r / min and the ball milling time is 1.5 h.

[0103] The modification method of the modified rice husk ash in this embodiment is as follows:

[0104] S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 155℃ at a rate of 2℃ / min, keep it at that temperature for 7.5min, and then lower the temperature to 55℃ at a rate of 3.5℃ / min.

[0105] S12: 5.5 parts of S11 rice husk ash, 2 parts of silane coupling agent, 12.5 parts of sodium alginate solution and 2 parts of stearic acid are thoroughly mixed, and finally washed with water and dried to obtain modified rice husk ash.

[0106] The silane coupling agent in this embodiment is silane coupling agent KH560.

[0107] The sodium alginate solution in this embodiment has a mass fraction of 10-15%.

[0108] Example 4.

[0109] This embodiment of a method for improving the soil stability of planting substrate for mangroves in coastal wetlands includes the following steps:

[0110] Step 1: Take the planting substrate soil from the mangrove forest and set it aside;

[0111] Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried.

[0112] Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:1. Then, mix 5 parts of modified rice husk ash, 2 parts of sodium humate and 3 parts of 5% chitosan solution by mass and stir thoroughly to obtain a stabilizing modifier.

[0113] Step four: Add 12% of the total dry soil volume of the stabilizer to the dry soil, then mix thoroughly.

[0114] The pH value of the phosphate buffer solution in this embodiment is 5.6.

[0115] In this embodiment, the stirring speed for the stirring adjustment process is 460 r / min, and the stirring time is 32 min.

[0116] The preparation method of the conditioning liquid in this embodiment is as follows:

[0117] S1: Heat-treat bentonite at 212℃ for 12 minutes, then cool it to room temperature at a rate of 3℃ / min for later use;

[0118] S2: Mix 4 parts of prepared bentonite, 2 parts of nano silica sol, 3 parts of sodium lignosulfonate solution and 4 parts of sodium citrate solution thoroughly to obtain bentonite agent;

[0119] S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until homogeneous, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully homogeneous to obtain the conditioning solution.

[0120] In this embodiment, the sodium lignosulfonate solution has a mass fraction of 3%; the sodium citrate solution has a mass fraction of 12%.

[0121] The hydrochloric acid solution in this embodiment has a mass fraction of 2%.

[0122] In this embodiment, the ball milling speed is 1200 r / min and the ball milling time is 1.2 h.

[0123] The modification method of the modified rice husk ash in this embodiment is as follows:

[0124] S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 152℃ at a rate of 2℃ / min, keep it at that temperature for 6min, and then lower the temperature to 55℃ at a rate of 3℃ / min.

[0125] S12: Mix 5 parts of S11 rice husk ash, 2 parts of silane coupling agent, 12 parts of sodium alginate solution and 2 parts of stearic acid thoroughly, and finally wash and dry to obtain modified rice husk ash.

[0126] The silane coupling agent in this embodiment is silane coupling agent KH560.

[0127] The sodium alginate solution in this embodiment has a mass fraction of 10-15%.

[0128] Comparative Example 1.

[0129] Unlike Example 3, no conditioning solution was used.

[0130] Comparative Example 2.

[0131] Unlike Example 3, dried hydroxyapatite was not added to the conditioning solution.

[0132] Comparative Example 3.

[0133] Unlike Example 3, no spare bentonite was added to the conditioning solution.

[0134] Comparative Example 4.

[0135] Unlike Example 3, no modified rice husk ash was added.

[0136] Comparative Example 5.

[0137] Unlike Example 3, S11 treatment was not used in the preparation of modified rice husk ash.

[0138] Comparative Example 6.

[0139] Unlike Example 3, S12 treatment was not used in the preparation of modified rice husk ash.

[0140] The soils from Examples 1-4 and Comparative Examples 1-6 were applied to environmental soil, and their performance was measured after 48 days. Simultaneously, the salt content of the original soil used as the planting substrate was measured to be 0.35%, and the soil organic matter content was measured to be 1.02%. The results are as follows.

[0141]

[0142]

[0143] From Examples 1-4 and Comparative Examples 1-6, it can be seen that the product of Example 3 of the present invention has excellent performance stability in terms of salt content and soil organic matter content. However, without the conditioning solution treatment and without the addition of modified rice husk ash, the salt content and soil organic matter content of the product change more significantly. Furthermore, without the addition of dried hydroxyapatite to the conditioning solution, without the addition of prepared bentonite to the conditioning solution, without the use of S11 treatment in the preparation of modified rice husk ash, and without the use of S12 treatment in the preparation of modified rice husk ash, the performance of the product tends to deteriorate. Only the product with conditioning solution treatment and modified rice husk ash prepared by the method of the present invention has the most significant performance effect.

[0144] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

[0145] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for improving the soil stability of planting substrate for mangroves in coastal wetlands, characterized in that, Includes the following steps: Step 1: Take the planting substrate soil from the mangrove forest and set it aside; Step two: Then, the substrate soil is first mixed and conditioned in a sufficient amount of conditioning solution, then filtered and dried. Step 3: Prepare a chitosan solution by mixing chitosan, deionized water and phosphate buffer solution in a weight ratio of 4:9:

1. Then, mix 4-7 parts of modified rice husk ash, 1-3 parts of sodium humate and 2-4 parts of 5% chitosan solution by mass and stir thoroughly to obtain a stabilizing modifier. Step 4: Add 10-15% of the total dry soil volume of the stabilizer to the dry soil, then mix thoroughly. The preparation method of the conditioning liquid is as follows: S1: Heat-treat bentonite at 210-220℃ for 10-15 minutes, then cool it to room temperature at a rate of 2-4℃ / min for later use; S2: Mix 3-6 parts of spare bentonite, 1-3 parts of nano silica sol, 2-5 parts of sodium lignosulfonate solution and 3-7 parts of sodium citrate solution thoroughly to obtain bentonite agent; S3: Stir hydroxyapatite in a sufficient amount of hydrochloric acid solution until uniform, then wash with water and dry. Ball mill the dried hydroxyapatite and bentonite agent at a weight ratio of 3:2 until fully mixed to obtain the conditioning solution. The modification method of the modified rice husk ash is as follows: S11: Mix the rice husk ash thoroughly in a sufficient amount of 5% potassium permanganate solution, then wash and dry it. Heat the dried rice husk ash to 150-160℃ at a rate of 1-3℃ / min, keep it at that temperature for 5-10min, and then lower the temperature to 55℃ at a rate of 2-5℃ / min. S12: Mix 4-7 parts of S11 rice husk ash, 1-3 parts of silane coupling agent, 10-15 parts of sodium alginate solution, and 1-3 parts of stearic acid thoroughly, then wash with water and dry to obtain modified rice husk ash.

2. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 1, characterized in that, The pH value of the phosphate buffer solution is 5.5-6.

0.

3. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 1, characterized in that, The stirring speed for the stirring adjustment process is 450-550 r / min, and the stirring time is 30-40 min.

4. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 3, characterized in that, The sodium lignosulfonate solution has a mass fraction of 2-5%; the sodium citrate solution has a mass fraction of 10-15%.

5. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 4, characterized in that, The hydrochloric acid solution has a mass fraction of 2%.

6. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 5, characterized in that, The ball milling speed is 1000-1500 r / min, and the ball milling time is 1-2 h.

7. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 6, characterized in that, The silane coupling agent is silane coupling agent KH560.

8. The method for improving the soil stability of planting substrate for mangroves in coastal wetlands according to claim 7, characterized in that, The sodium alginate solution has a mass fraction of 10-15%.

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