Fast treatment method for spartina alterniflora based on micp

Abstract

The application discloses a Spartina alterniflora rapid treatment method based on MICP and belongs to the technical field of Spartina alterniflora treatment. The Spartina alterniflora rapid treatment method based on MICP comprises the following steps: step one, cutting Spartina alterniflora by using a mower; step two, scattering quicklime powder into a treatment area, and turning the quicklime powder and the cut Spartina alterniflora straw into soil; step three, uniformly inserting a plurality of degradable hollow bamboo poles into the soil, connecting the hollow bamboo poles with a grouting pump, and injecting a reaction solution into the soil through the hollow bamboo poles; step four, after the injection of the reaction solution is completed, blowing a layer of sea mud on the soil; and step five, planting local plant species on the sea mud. The method can utilize microorganisms to induce the generation of calcium carbonate precipitation. After the calcium carbonate precipitation, the calcium carbonate precipitation is adsorbed in soil particle pores to block soil pores, a dense hardened layer is formed to hinder the growth of Spartina alterniflora, Spartina alterniflora can be treated rapidly at one time, and the rapid repair of a tidal flat wetland ecosystem can be realized.

Description

Technical Field

[0001] This invention relates to the field of Spartina alterniflora control technology, and in particular to a rapid control method for Spartina alterniflora based on MICP. Background Technology

[0002] MICP technology is a biogeological process that utilizes microbial activity to promote calcium carbonate precipitation. This method is environmentally friendly, sustainable, and fast, and is widely used in soil stabilization, pollution remediation, and other fields.

[0003] Spartina alterniflora, belonging to the genus Spartina in the family Poaceae, possesses a well-developed root system and a high tolerance for salinity, which has facilitated its rapid spread in tidal flats and wetlands. Therefore, Spartina alterniflora has become one of the invasive species that seriously impacts the ecological environment of estuaries and coastal ecosystems. Currently, the most common methods for controlling Spartina alterniflora are physical methods such as mowing and flooding. While these physical methods are safe and environmentally friendly, their overall control efficiency is relatively low, requiring continuous management over a period of 3 months to 1 year. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a rapid control method for Spartina alterniflora based on MICP, which can block soil pores, inhibit the growth of Spartina alterniflora, and achieve rapid control of Spartina alterniflora.

[0005] According to a first aspect of the present invention, a rapid control method for Spartina alterniflora based on MICP includes...

[0006] Step 1: Use a lawnmower to cut Spartina alterniflora;

[0007] Step 2: Spread quicklime powder in the treated area of ​​Spartina alterniflora, and use tillage equipment to turn the quicklime powder and the cut Spartina alterniflora straw into the soil;

[0008] Step 3: Insert several biodegradable hollow bamboo poles evenly into the soil, connect the hollow bamboo poles to the grouting pump, and inject the reaction solution into the soil through the hollow bamboo poles.

[0009] Step four: After the reaction solution is injected, a layer of marine mud is blown onto the soil.

[0010] Step 5: Plant native plant species on the sea mud.

[0011] The MICP-based rapid control method for Spartina alterniflora according to embodiments of the present invention has at least the following beneficial effects: adding quicklime powder to the soil and allowing it to react rapidly with water in the soil to release heat and evaporate the moisture in the soil, thereby increasing the looseness of the soil. On the one hand, this provides conditions for injecting the reaction solution, and on the other hand, it provides a calcium source for the microorganisms in the reaction solution. Then, the microorganisms induce the production of calcium carbonate precipitation. After the calcium carbonate precipitation, it is adsorbed into the pores of soil particles and blocks the soil pores, forming a dense hardened layer that hinders the growth of Spartina alterniflora. This method can quickly control Spartina alterniflora in one go and achieve rapid restoration of the tidal flat wetland ecosystem.

[0012] According to some embodiments of the present invention, in step two, the amount of quicklime powder used is 10 to 15 kg / m³. 2 .

[0013] According to some embodiments of the present invention, in step two, the tillage depth of Spartina alterniflora is 30 to 50 cm.

[0014] According to some embodiments of the present invention, in step three, the reaction solution consists of a high-urease-producing bacterial solution and a urea solution.

[0015] According to some embodiments of the present invention, in step three, the activity of the high-yield urease-producing bacteria is 3 × 10⁻⁶. 8 The concentration of urea solution is 4 to 8 g / L, with cells / mL.

[0016] According to some embodiments of the present invention, in step three, the hollow bamboo pole has several through holes along its length, and the reaction liquid can be injected into the soil at different depths through the several through holes.

[0017] According to some embodiments of the present invention, in step three, the injection volume of the reaction solution is 5 to 10 L / m2.

[0018] According to some embodiments of the present invention, in step three, the injection rate of the reaction solution is 5 to 10 L / min.

[0019] According to some embodiments of the present invention, in step three, the treatment area of ​​Spartina alterniflora is divided into several unit areas, and several unit areas are grouted in sequence.

[0020] According to some embodiments of the present invention, in step four, the thickness of the dredged mud is 0.8 to 1.5 m.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a flowchart illustrating the rapid control method for Spartina alterniflora based on MICP according to an embodiment of the present invention. Detailed Implementation

[0024] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0025] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0026] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0027] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0028] refer to Figure 1 A rapid control method for Spartina alterniflora based on MICP is described according to an embodiment of the present invention.

[0029] like Figure 1 As shown, the rapid control method for Spartina alterniflora based on MICP according to an embodiment of the present invention includes:

[0030] Step 1: Use a lawnmower to cut Spartina alterniflora;

[0031] Step 2: Spread quicklime powder in the treated area of ​​Spartina alterniflora, and use tillage equipment to turn the quicklime powder and the cut Spartina alterniflora straw into the soil together;

[0032] Step 3: Divide the treatment area of ​​Spartina alterniflora into several unit areas. Insert several biodegradable hollow bamboo poles evenly into the soil of each unit area. Connect the hollow bamboo poles and the grouting pump to each unit area. Inject the reaction solution into the soil through the hollow bamboo poles and grout the unit areas in sequence.

[0033] Step four: After the reaction solution is injected, a layer of marine mud is blown onto the soil.

[0034] Step 5: Plant native plant species on the sea mud.

[0035] In some specific embodiments of the present invention, in step two, the amount of quicklime powder sprinkled into the soil is 10 to 15 kg / m2. After the quicklime powder is tilled, it reacts with water, generating a large amount of heat that causes the water in the soil to evaporate rapidly. As the water evaporates, voids are created in the soil, providing conditions for the subsequent injection of the reaction solution into the soil.

[0036] In some specific embodiments of the present invention, in step two, the Spartina alterniflora is tilled to a depth of 30 to 50 cm. The tilled Spartina alterniflora straw is evenly mixed with the soil. When the reaction solution enters the soil through the hollow bamboo pole, the Spartina alterniflora straw can serve as an injection channel for the reaction solution. The reaction solution disperses and flows in the soil through the Spartina alterniflora straw, thereby further improving the uniformity of the reaction solution in the soil.

[0037] It should be noted that mowing can break the roots and above-ground parts of Spartina alterniflora, disrupting its growth environment. Mixing the Spartina alterniflora stalks with the soil makes it difficult for the plant to regrow roots. At the same time, mixing the Spartina alterniflora stalks with the soil helps to accelerate the decomposition and degradation process of Spartina alterniflora. The more the stalks are in contact with the soil, the easier they are to be decomposed by microorganisms. Spartina alterniflora is converted into organic matter, thereby promoting soil improvement and restoration. It can change the soil structure, increase soil aeration, water retention and fertility, which is beneficial to the growth and restoration of subsequent vegetation, thus further inhibiting the regeneration of Spartina alterniflora.

[0038] In some specific embodiments of the present invention, the reaction solution consists of a high-urease-producing bacterial solution and a urea solution, wherein the activity of the high-urease-producing bacteria is 3 × 10⁻⁶. 8 The concentration of urea solution is 4 to 8 g / L, with cells / mL.

[0039] In some specific embodiments of the present invention, a number of through holes are opened along the length direction at the end of the hollow bamboo pole inserted into the soil. Specifically, two through holes are opened every 10 to 15 cm along the length direction of the hollow bamboo pole to ensure that the reaction liquid can be injected into the soil at different depths through the through holes at different heights.

[0040] In some specific embodiments of this invention, if the injection rate of the reaction solution is too fast, the liquid may erode soil particles, damage the soil structure, thereby increasing soil porosity, exacerbating the loss of the reaction solution, affecting the biogeological process of calcium carbonate precipitation, and impacting soil calcification. Conversely, if the injection rate is too slow, the reaction solution may not be evenly distributed to the area to be treated, resulting in uneven treatment effects. Some areas may receive higher concentrations of treatment while others receive lower concentrations, thus weakening the treatment effect. Therefore, when the injection rate of the reaction solution is 5 to 10 L / m³, 2 The best results can be achieved when the injection rate is 5 to 10 L / min.

[0041] In some specific embodiments of this invention, the thickness of the marine mud fill is 0.8 to 1.5 m. It should be noted that marine mud refers to sediment from the ocean floor, mainly composed of suspended particles, organic matter, and minerals. Because marine mud is rich in organic matter and nutrients, it can provide nutrients and energy sources for the marine ecosystem. Similarly, marine mud can also be used for soil improvement. The organic matter and nutrients in marine mud can provide the nutrients and trace elements needed for plant growth, thereby improving soil structure and fertility. When native species are planted on marine mud, the plants can grow healthily in the marine mud environment, not only promoting the regeneration of Spartina alterniflora but also facilitating the rapid restoration of tidal flat wetland ecosystems.

[0042] The following is a specific implementation example to illustrate this rapid control method for Spartina alterniflora based on MICP:

[0043] The sample plot in this embodiment is located in a typical distribution area of ​​Spartina alterniflora in the coastal waters of the Haozhigang-Tanglugang area in Nantong City, Jiangsu Province, and a 500m wide sample plot was selected on the beach surface. 2 The Spartina alterniflora community was designated as the treatment area.

[0044] Step 1: In April or May, during the flowering period of Spartina alterniflora, after the tide recedes, use a lawnmower to cut and remove the above-ground living parts of Spartina alterniflora, so that the height of the above-ground Spartina alterniflora plant remains after cutting is less than 5cm.

[0045] Step two, after the above-ground parts are cut, spread 15 kg / m² of fertilizer in the treated area. 2 The quicklime powder was then used in combination with a water excavator and a land excavator to plow the above-ground living parts of Spartina alterniflora and the quicklime powder to within 50cm of the ground.

[0046] Step 3: Select 50cm long hollow bamboo poles and make two through holes every 15cm on each pole. Vertically insert one hollow bamboo pole into the soil every 50cm within the treatment area. Bury the hollow bamboo poles in the soil with their tops protruding 5cm above the soil surface. Then, divide the treatment area into several unit areas. Connect a grouting pump to the hollow bamboo poles in each unit area to pump the reaction solution into the soil through the hollow bamboo poles.

[0047] Step 4: Two days after injecting the reaction solution, the marine mud outside the treatment area is dredged into the treatment area by a dredger, with a dredging thickness of 1m.

[0048] Step 5: After the reclamation is completed, plant local species Suaeda salsa and Imperata cylindrica on the surface of the sea mud at a density of 10 plants per square meter.

[0049] It should be noted that the flowering period refers to the time when a plant's flowers begin to open and display their blossoms. In the plant's life cycle, the flowering period is usually an important stage. The opening of the flowers attracts pollinators to spread pollen, and the pollination and fertilization process of the flowers also leads to the formation of seeds. Therefore, it marks the beginning of the plant's reproductive stage.

[0050] If plants suffer damage during this critical period, such as damaged flowers or impaired pollen dispersal, pollinators may face obstacles in attracting and utilizing plant resources, affecting pollination efficiency. Furthermore, plants typically undergo growth and metabolic adjustments during flowering to support flower development and reproduction; stem injuries or leaf damage result in significant energy and nutrient losses, inhibiting or delaying plant growth. Therefore, controlling Spartina alterniflora during its flowering period can biologically suppress its regeneration.

[0051] Two days after the injection of the reaction solution, the topsoil in the treated area was basically completely solidified, and the soil porosity decreased significantly. One year after the completion of all treatment processes, Spartina alterniflora did not reappear in the treated area, and the coverage of native species was restored to 90%. Therefore, the method of this embodiment completely eradicated Spartina alterniflora in the treated area and completed the restoration of native species.

[0052] Therefore, by adding quicklime powder to the soil and allowing it to react rapidly with the water in the soil, heat is released to evaporate the moisture in the soil, thereby increasing the looseness of the soil. On the one hand, this provides conditions for injecting the reaction solution, and on the other hand, it provides a calcium source for the microorganisms in the reaction solution. Then, the microorganisms induce the production of calcium carbonate precipitation. After the calcium carbonate precipitates, it is adsorbed into the pores of soil particles and blocks the soil pores, forming a dense hardened layer that hinders the growth of Spartina alterniflora. This method can quickly control Spartina alterniflora in one go and achieve rapid restoration of the tidal flat wetland ecosystem.

[0053] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A rapid control method for Spartina alterniflora based on MICP, characterized in that, include: Step 1: During the flowering period of Spartina alterniflora, use a lawnmower to cut Spartina alterniflora. Step 2: Spread quicklime powder in the treated area of ​​Spartina alterniflora, and use tillage equipment to turn the quicklime powder and the cut Spartina alterniflora straw into the soil; Step 3: Insert several biodegradable hollow bamboo poles evenly into the soil, connect the hollow bamboo poles to the grouting pump, and inject the reaction solution into the soil through the hollow bamboo poles. Step four: After the injection of the reaction solution is completed, a layer of sea mud is blown onto the soil. Step 5: Plant native plant species on the sea mud; In step two, the amount of quicklime powder used is 10 to 15 kg / m²; In step three, the hollow bamboo pole has several through holes along its length at the end inserted into the soil. The reaction solution can be injected into the soil at different depths through these through holes. The reaction solution consists of high-yield urease bacteria solution and urea solution.

2. The rapid control method for Spartina alterniflora based on MICP according to claim 1, characterized in that, In step two, the Spartina alterniflora is tilled to a depth of 30 to 50 cm.

3. The rapid control method for Spartina alterniflora based on MICP according to claim 1, characterized in that, In step three, the activity of the high-urease-producing bacteria is 3 × 10⁻⁶. 8 The concentration of urea solution is 4 to 8 g / L, with cells / mL.

4. The rapid control method for Spartina alterniflora based on MICP according to claim 1, characterized in that, In step three, the injection volume of the reaction solution is 5 to 10 L / m².

5. The rapid control method for Spartina alterniflora based on MICP according to claim 1, characterized in that, In step three, the injection rate of the reaction solution is 5 to 10 L / min.

6. The rapid control method for Spartina alterniflora based on MICP according to claim 1, characterized in that, In step three, the treatment area of ​​Spartina alterniflora is divided into several unit areas, and several of the unit areas are grouted in sequence.

7. The rapid control method for Spartina alterniflora based on MICP according to claim 1, characterized in that, In step four, the thickness of the dredged mud is 0.8 to 1.5 m.

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