Reef body device for constructing seaweed bed in special environment and preparation and use method of reef body device

Abstract

The invention discloses a reef body device for constructing a sea grass bed in a special environment and a preparation and use method thereof.The device comprises a reef body frame, an inverted filter layer and a vegetation layer, the reef body frame comprises a lower circular-truncated-cone-shaped supporting frame and an upper cylindrical vegetation space, and the supporting frame and the vegetation space form an integrated hollow frame structure; the support frame is provided with a plurality of through holes with different sizes to form biological channels, the support frame is also provided with a plurality of water flow channels, the bottom surface of the vegetation space divides the support frame and the vegetation space into two parts through a bottom plate, the inverted filter layer is arranged on the bottom plate of the bottom surface of the vegetation space, and the inverted filter layer is arranged on the bottom plate of the vegetation space. The vegetation layer is arranged on the inverted filter layer. According to the method, the prepared reef body device is used for cultivating in the initial stage of sea grass transplanting in a cultivation pond, and after sea grass is completely fixed to the reef body, the reef body is put in. According to the method, the feasibility of constructing the sea grass bed can be improved in an area with relatively poor substrate type or substrate environment suitability.

Description

Technical Field

[0001] The present invention relates to the technical field of marine ecological restoration, and more specifically, to a reef device suitable for constructing a seagrass bed in a special environment where the bottom is not suitable, and a preparation and use method thereof. Background Art

[0002] Seagrass is a clonal marine angiosperm. The ecosystem formed by the continuous distribution of seagrass is called a seagrass bed. Seagrass beds are precious "undersea forests" with important ecosystem service functions. They can purify water quality, provide food sources and habitats for offshore fish, increase biodiversity, fix the bottom of the sea and protect the coast. They also have an important carbon storage function. It is estimated that the annual carbon fixation of seagrass beds accounts for about 18% of the total carbon fixation in the ocean, and the carbon accumulation rate of seagrass beds is about 83gC / (m 2 •a), higher than most terrestrial systems. Seagrass beds composed of seagrasses are known as the three typical shallow sea ecosystems together with mangroves and coral reefs, and international research results show that the ecological service value of seagrass is significantly higher than the ecological service value of mangroves and coral reefs. However, this ecosystem is also one of the most fragile ecosystems on the earth. The habitat is gradually degrading and losing, and the decline of seagrass around the world is accelerating. The reduction in the area of ​​global seagrass beds has also led to the aggravation of the deterioration of the coastal ecological environment. Therefore, it is of great significance and benefit to take artificial measures to intervene and restore the degraded seagrass beds or build new artificial seagrass beds to expand the area of ​​seagrass beds.

[0003] Seagrass beds have relatively high requirements for the marine environment. Before repairing or constructing seagrass beds, feasibility assessments need to be conducted. Indicators such as coast type, bottom type, bottom environment, ocean hydrology, and seawater quality will affect the results of the marine environment suitability assessment. The current seagrass bed construction or restoration work is mainly carried out in areas with high or relatively high suitability. Existing technologies make it difficult to construct or restore seagrass beds in environments with low suitability, with high economic costs and poor results. Summary of the invention

[0004] One object of the present invention is to provide a reef device for constructing seagrass beds in special environments and a method for preparing and using the same, which can improve the feasibility of constructing seagrass beds in areas with poor suitability of bottom types or bottom environments.

[0005] In order to solve the above technical problems, the present invention provides a reef device for constructing seagrass beds in special environments, including a reef frame and an inverted filtration layer and a vegetation layer arranged in the reef frame, the reef frame including a truncated cone-shaped support frame at the bottom and a cylindrical vegetation space at the top, the support frame and the vegetation space form an integrated hollow frame structure, the support frame is provided with a plurality of through holes of different sizes to form a biological channel, the support frame is also provided with a plurality of water flow channels, the bottom surface of the vegetation space is divided into two parts by a bottom plate, the inverted filtration layer is arranged on the bottom plate of the bottom surface of the vegetation space, and the vegetation layer is arranged on the inverted filtration layer.

[0006] Preferably, the reef frame is cast by a vegetation concrete material to form an integrated structure, and the bottom plate is also cast by a vegetation concrete material to form an integrated structure with the reef frame.

[0007] Preferably, the filter layer is a mixed crushed stone filter layer, which is paved with mixed crushed stones of a set thickness of 10 to 60 mm.

[0008] Preferably, a plurality of rectangular water flow channels are evenly spaced along a circumferential circle on the top of the support frame, and the biological channel is located below the water flow channel.

[0009] Preferably, the vegetation layer includes a vegetation concrete layer, planting soil and seaweed, the vegetation concrete layer and the reef frame are cast on the inverted filter layer using the same material, the planting soil is filled into the pores of the vegetation concrete layer, the rhizomes of the seaweed are fixed in the temporary planting soil at the beginning of the cultivation stage, and are fixed on the vegetation concrete layer after the cultivation stage, and the temporary planting soil is a planting soil layer laid on the vegetation concrete layer.

[0010] Preferably, the thickness of the vegetation layer is at least greater than the length of the seaweed rhizomes to be planted.

[0011] The present invention also provides a method for preparing and using a reef device for constructing a seagrass bed in a special environment. The prepared reef device is used in a breeding pond for the initial cultivation of seagrass transplantation. When the seagrass is completely fixed on the reef, the reef is placed in a set placement area.

[0012] Preferably, the preparation of the reef device includes the following steps: first, integrally cast the reef frame structure or first cast the support frame and the base plate, and then cast the vegetation space structure on the support frame; second, cut several biological channels and water flow channels on the support frame according to the design; third, apply a layer of waterproof coating on the inner wall of the vegetation space wall, and lay a filter layer on the base plate according to the designed thickness, and tamp the gravel to make it dense; then, prepare vegetation concrete, and pour it on the filter layer according to the designed thickness, and form a vegetation concrete layer after solidification; then, prepare planting soil, and fill it into the pores of the vegetation concrete layer; finally, lay temporary planting soil of a set thickness on the vegetation layer, and plant seaweed according to the set transplanting density.

[0013] Preferably, the prepared reef device is hung in a breeding pond for cultivation, seawater is introduced into the breeding pond, and the water depth is controlled to exceed the set height of the overall height of the reef. During the cultivation process, when evaporation causes the water level to drop, fresh water is added to maintain salinity stability; when the transplanted seaweed rhizomes develop and are fixed on the vegetation layer, the reef device can be placed.

[0014] Preferably, the growth of seaweed is continuously monitored after the reef device is deployed. When the survival rate of seaweed is lower than the set range due to force majeure, the substrate wrapping transplantation method is used for replanting. The transplanted plants are wrapped with a beneficial substrate and then placed on the reef vegetation layer.

[0015] The present invention has at least the following beneficial effects: (1) The present invention expands the feasible scope of artificially constructing seagrass beds, and provides a feasible technology for constructing seagrass beds in areas where the bottom mud content is too low, the physical and chemical properties are unfavorable, the bottom is lacking, and the sedimentation is serious, which is not conducive to the construction of seagrass beds. It is conducive to further improving the ecological environment of the above-mentioned areas, and is also conducive to increasing the sink of marine blue carbon and addressing the problem of global climate change; (2) The present invention has strong ecological properties and has both seaweed bed and fish reef effects. Its hard surface is rough and porous and can provide a fixed matrix for attached organisms. The two provide beneficial effects to each other. The seaweed bed can further improve the suitability of fish reproduction and spawning on the fish reef and increase its attractiveness to fish. The excrement and carcasses of fish activities can increase the fertility of the area and improve the growth effect of seaweed. (3) The present invention has a long service life. The reef body is in the shape of a truncated cone, which is stable and not easy to tip over. The vegetation concrete structure has high strength and is not easy to be damaged. Its unique structure protects the planting soil in the pores of the vegetation layer from being lost. The vegetation layer has a certain height relative to the bottom soil, which can keep the vegetation layer from being buried in a silted environment, thus maintaining an environment conducive to the growth of seaweed for a long time. (4) The seaweed of the present invention has a good restoration effect. The initial cultivation of seaweed transplantation is carried out in the aquaculture pond, providing a stable, suitable and friendly environment during its vulnerable period. When the seaweed is completely fixed on the reef, the reef is released, ensuring that the constructed seaweed bed has a high survival rate and a good growth effect.

[0016] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the reef device of the present invention; Figure 2 It is a structural schematic diagram of the reef frame of the present invention; Figure 3 It is a cross-sectional schematic diagram of the reef device of the present invention.

[0018] Description of reference numerals: 1. Reef frame, 2. Mixed gravel filter layer, 3. Vegetation layer, 4. Seaweed, 5. Support frame, 6. Biological channel, 7. Water flow channel, 8. Connecting column, 9. Bottom of vegetation space, 10. Vegetation space wall, 11. Vegetation concrete layer, 12. Planting soil. DETAILED DESCRIPTION

[0019] In order to better understand the purpose, structure and function of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement it according to the description.

[0020] It should be noted that the experimental methods described in the following embodiments are conventional methods unless otherwise specified, and the reagents and materials are commercially available unless otherwise specified; in the description of the present invention, the terms "lateral", "longitudinal", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0021] like Figures 1 to 3 As shown, the present invention provides a reef device suitable for constructing a seagrass bed in a special environment with unsuitable bottom soil, comprising a reef frame 1, a mixed gravel filter layer 2, and a vegetation layer 3.

[0022] The reef frame is an integrated structure cast with vegetation concrete material. The overall lower part is a truncated cone, the lower bottom surface of the truncated cone is hollow, and the overall upper part is cylindrical. Its size and thickness can be designed according to the hydrological conditions of the target area and the scale of deployment. The size of the truncated cone includes the diameter and height of the upper and lower surfaces. The overall stability of the reef body must be ensured, and it will not capsize under the action of waves. The thickness of the reef body must ensure the structural strength of the reef body. When the diameter of the lower bottom surface of the reef body is greater than 5m, the reef body frame can consider reinforcement to improve the strength. The reef body frame includes a support frame 5, a biological channel 6, a water flow channel 7, a connecting column 8, a vegetation space bottom surface 9, and a vegetation space wall 10.

[0023] The vegetation concrete comprises 20 mm to 40 mm crushed stone, PO42.5 cement, and special additives for vegetation concrete.

[0024] The support frame is the side surface of the frustum structure at the lower part of the reef frame.

[0025] The biological channel is arranged on the support frame and is a circular through-hole structure of different sizes.

[0026] The bottom surface of the vegetation space is circular, forming the upper top surface of the lower truncated cone structure of the reef frame and the lower bottom surface of the upper cylindrical structure thereof, forming a bottom plate, which is also integrally cast by the same material as the reef frame.

[0027] The bottom surface of the vegetation space and the support frame are fixed by connecting columns, and the gap between the three forms a water flow channel. The connecting column is composed of the remaining part when the water flow channel is cut out from the upper part of the support frame, that is, the part between adjacent water flow channels is the connecting column, with a width of 200~300mm to ensure that the water flow channel will not be damaged. The water flow channel is rectangular, 100mm high and 1000~1500mm wide.

[0028] The vegetation space enclosure is arranged above the edge of the bottom surface of the vegetation space and has a height of 700 mm.

[0029] The mixed crushed stone filter layer is arranged on the bottom surface of the vegetation space and is paved with 200mm thick 10-60mm mixed crushed stone. The thickness of the filter layer is 150mm-250mm. The function of the filter layer is to prevent the planting soil in the pores of the vegetation concrete from being lost from below.

[0030] The vegetation layer is arranged on the mixed gravel filter layer, with a thickness of 400mm, and includes a vegetation concrete layer 11, planting soil 12 and seaweed 4. The vegetation concrete layer is made of the same material as the reef frame, and the planting soil includes soil, organic matter, and compound fertilizer, which are filled in the pores of the vegetation concrete layer. The length of the rhizome of seaweed basically does not exceed 20cm. As long as the thickness of the vegetation layer is greater than this, it can meet the planting requirements and does not affect the growth effect of seaweed. The thickness can be set to 200~400mm.

[0031] The present invention provides a reef device suitable for constructing a seagrass bed in an environment with unsuitable bottom soil. Through a vegetation concrete frame, a suitable fixing matrix is ​​provided for the rhizomes of seagrass plants in unsuitable environments such as low bottom mud content, unfavorable physical and chemical properties, and lack of bottom soil. The pores of the vegetation concrete are filled with planting soil, and the reef structure is specially designed. A water flow channel is set below the bottom surface of the vegetation space. When the water body flows, the water flow velocity on the lower surface of the bottom surface of the vegetation space is guaranteed. The vegetation layer is planted with seagrass vegetation, and the water flow velocity on its surface is greatly reduced. A pressure difference is formed on the upper and lower surfaces due to the flow velocity difference. The pore water inside the vegetation space seeps from top to bottom, and a mixed gravel filter layer is set below it to protect the planting soil from being lost from below, and to maintain it in the pores of the vegetation concrete layer for a long time, providing nutrients for the seagrass plants for a long time.

[0032] The support frame under the bottom of the vegetation space makes the vegetation layer of seaweed grow at a certain height relative to the bottom, providing space for silt sedimentation, and the seaweed growth layer has good anti-siltation and burial ability. The support frame is provided with a biological channel, which also has the function of artificial fish reef. The material used is more eco-friendly, and its hard surface is rough and porous, which can also provide a matrix for attached organisms, further improve the ecological environment of the sea area, create a good environment for marine organisms to live, and provide fishes with a place to reproduce, grow, feed and shelter from enemies, so as to achieve the purpose of protection, proliferation and increase of fish catch.

[0033] The present invention also discloses a method for preparing and using a reef device suitable for constructing a seagrass bed in a special environment with unsuitable bottom conditions, comprising the following steps: S1. After assembling the truncated cone mold, the dimensions used in this project are 5m in diameter at the bottom, 4m in diameter at the top, 1m in height, and 500mm in thickness. Then mix the vegetation concrete and pour 20mm~40mm crushed stone aggregate into the concrete mixer. 3Add 250-350kg of PO42.5 cement to the crushed stone, add an appropriate amount of special additives for vegetation concrete, mix well and pour into the mold to form a hollow truncated cone frame at the bottom. The side of the truncated cone is the support frame, and the top of the truncated cone is the bottom of the vegetation space. After the concrete solidifies, remove the mold. The main purpose of the vegetation concrete additive is to reduce alkali, and it also has the function of increasing the structural strength of the vegetation concrete. 3 Adding 25-30 kg of gypsum or silica fume and other additives to the crushed stone, as well as various additives available on the market, can meet the requirements. The special additives for vegetation concrete in this application project are "per m 3 Adding 25-30kg of silica fume as an additive to the crushed stone can reduce alkali and improve the structural strength of the green concrete to a certain extent.

[0034] S2. Use a concrete cutter to cut circular biological channels of different sizes on the support frame, and cut a water flow channel with a height of 100mm and a width of 1000-1500mm at the connection between the support frame and the bottom surface of the vegetation space. The interval between adjacent water flow channels is 200-300mm, and the remaining part is the connecting column.

[0035] S3, arranging a mold at the bottom edge of the vegetation space, mixing vegetation concrete according to the same formula as in step S1 and pouring to form the vegetation space wall, and removing the mold after the concrete solidifies. A layer of waterproof coating is applied to the inner wall of the vegetation space wall.

[0036] S4. A mixed crushed stone filter layer with a graded particle size of 10 mm to 60 mm is laid on the bottom surface of the vegetation space with a thickness of 200 mm, and the crushed stone is compacted by manual tamping.

[0037] S5. Pour 20mm~40mm diameter crushed stone into the concrete mixer. 3 Add 250-350kg of PO42.5 cement to the crushed stone, add an appropriate amount of special additives for vegetation concrete (the same as for casting the reef frame), mix evenly and pour it onto the mixed crushed stone filter layer. The pouring thickness is 400mm, and the upper surface is manually smoothed. Curing for 28 days until the concrete is completely solidified to form the vegetation concrete layer.

[0038] S6, in every m 3Add 35-45kg of organic matter (rice husks, straw, crushed rice straw) and 5-7kg of compound fertilizer to the soil (if the nutrients in the selected soil are relatively abundant, compound fertilizer may not be added). The type and amount of compound fertilizer added are determined by measuring the nutrient content of the soil used, and then according to the optimal nutrient content range described in the relevant specifications for seagrass bed restoration. Stir evenly to make planting soil. Take an appropriate amount of the planting soil, add water and an appropriate amount of water reducer to prepare a planting soil slurry. The water reducer is used to increase the fluidity of the slurry and facilitate the filling of the planting soil into the pores of the vegetation concrete. The optimal amount of addition varies according to the properties of the planting soil. Use a cement gun to fill the planting soil into the pores of the vegetation concrete layer. Since the planting soil slurry will shrink after losing water, multiple grouting can be performed.

[0039] The total nitrogen and total phosphorus concentrations in the seawater in the project area are 0.2691 mg / L and 0.0387 mg / L respectively, and the total nitrogen and total phosphorus contents of the sediments used are 0.187 g / kg and 0.034 g / kg respectively. The nutrient content is relatively poor compared to the main distribution areas of seagrass beds along the coast of my country. 3 40kg of organic matter consisting of 15kg of rice husk, 15kg of straw and 10kg of crushed rice straw is added to the soil, and 5-7kg of compound fertilizer is applied to each cubic meter of soil, which is a nitrogen, phosphorus and potassium compound fertilizer of 15-15-15. The water reducer is a polycarboxylic acid high-performance water reducer, and the addition amount is per m 3 4.6~11.5kg of planting soil, such as 8.5kg, and 175kg of water.

[0040] S7. Lay 50mm thick temporary planting soil on the vegetation layer. The temporary planting soil can be the same as the planting soil filled in the pores of the vegetation concrete layer. Select seaweed species that are suitable for the hydrology, water quality, and climatic conditions of the target area, and select wild or artificially cultivated plants to be transplanted in the waters near the target area. In this application project, the seaweed selected is the suitable Japanese eel grass. Wild Japanese eel grass plants are collected in the waters near this project, and their rhizomes are fixed in the temporary planting soil using the nail method. The planting density of seaweed on the reef body is determined according to the selected seaweed species, which is the same as the transplantation density generally used when constructing artificial seaweed beds in natural substrates. In this application project, 600 plants are planted on each reef body.

[0041] S8. The reef is suspended in a breeding pond for cultivation. Seawater is introduced into the pond and the water depth is controlled to be about 0.5m higher than the overall height of the reef, at 2.6-2.8m. During the cultivation process, evaporation causes the water level to drop. When water is needed, fresh water is added to maintain salinity stability. In this application project, after one month of cultivation in the breeding pond, the seaweed rhizomes are well developed, the colonization process is completed, and they are fixed on the vegetation layer. The average length of the new roots reaches 20mm, and the average plant height reaches 350mm. The survival rate of seaweed in the breeding pond cultivation stage reaches 100%, and the stem and branch density increases by about 3.7%.

[0042] S9. When the transplanted seaweed rhizomes develop and are fixed on the vegetation layer, the reef placement can begin. Before placement, temporary buoys are set at the edge of the placement area. The number of buoys in the reef placement area is determined according to the area and shape of the reef area. Generally, 4 to 8 buoys are set so that all reefs are within the polygon formed by the buoys until the reef placement is completed. After using satellite positioning equipment to determine the preset placement position, the reef is transported to the reserved position in the target sea area. The positioning accuracy error should be controlled to be less than 5m. Use four-point lifting to lift it to the seabed and then unhook it for placement, ensuring that the bottom of the reef is at the bottom and the vegetation layer is at the top. In order to ensure the safety of ship navigation, fishing boat operations and reefs, internationally accepted marine buoys should be installed as special buoys in the reef placement area. The placement location and density of the reef can be comprehensively considered based on regional hydrological conditions, habitat potential, and restoration scale.

[0043] This application project applies the technical solution of the present invention to construct a seagrass bed with a width of 50m on a 1km long coastline. The weight percentage of the bottom mud content in this area is less than 50%, which is not suitable for restoring the seagrass bed. The reefs are arranged in a square array with 67 columns, 3 reefs in each column, and the spacing between adjacent reefs is 10m. Before deployment, temporary buoys are set at the edge of the deployment area. The number of buoys in the reef deployment area is determined according to the area and shape of the reef area. This project sets 4 buoys so that all reefs are within the rectangle formed by the buoys until the reefs are deployed.

[0044] S10. The growth of seagrass should be continuously monitored within one year after the reef is placed. When the survival rate of seagrass is too low due to natural disasters or other factors, the substrate wrapping transplantation method can be used for replanting. The transplanted plants should be wrapped with a beneficial substrate and then placed on the reef vegetation layer.

[0045] One year after the reef was deployed, the survival rate of seagrass reached 82.7%, the seagrass coverage on the reef increased by 9.3% compared with the deployment, the stem density increased by 8.2%, and the average height of seagrass plants reached 400mm. Shellfish, snails and other organisms attached to the hard surface of the reef, among which oysters were the most numerous, with an average shell height of 19.88mm, an average fatness of 4.11%, and an average density of oysters of 83 / m 2 , the regional large benthic biomass increased by 7.4%, and the average dissolved oxygen in the water increased by 5.2 mg / L. The regional fish aggregation rate increased significantly. One year after the project was implemented, the fishery output value of the region increased by 5.7%.

[0046] The test results of the above project show that the project of this application applied the technology of the present invention and successfully constructed an artificial seagrass bed in an area with unsuitable bottom soil. The constructed seagrass bed grew well, combined with the fish reef function of the reef body and the function of providing a matrix for attached organisms, it has played a very high ecological benefit and improved the ecological and economic value of the coastline.

[0047] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation mode, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, other modifications can be easily implemented, so without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A reef device for constructing seagrass beds in special environments, characterized in that: It includes a reef frame and an inverted filtration layer and a vegetation layer arranged in the reef frame. The reef frame includes a truncated cone-shaped support frame at the bottom and a cylindrical vegetation space at the top. The support frame and the vegetation space form an integrated hollow frame structure. The support frame is provided with a plurality of through holes of different sizes to form a biological channel. The support frame is also provided with a plurality of water flow channels. The bottom surface of the vegetation space divides the support frame and the vegetation space into two parts through a bottom plate. The inverted filtration layer is arranged on the bottom plate of the bottom surface of the vegetation space, and the vegetation layer is arranged on the inverted filtration layer.

2. The reef device for constructing seagrass beds in special environments as claimed in claim 1, characterized in that: The reef frame is cast by vegetation concrete material to form an integrated structure, and the bottom plate is also cast by vegetation concrete material to form an integrated structure with the reef frame.

3. The reef device for constructing seagrass beds in special environments as claimed in claim 1, characterized in that: The filter layer is a mixed crushed stone filter layer, which is paved with mixed crushed stones of a set thickness of 10-60 mm.

4. The reef device for constructing seagrass beds in special environments as claimed in claim 1, characterized in that: A plurality of rectangular water flow channels are evenly spaced along a circumferential circle on the top of the support frame, and the biological channel is located below the water flow channel.

5. The reef device for constructing seagrass beds in special environments as claimed in claim 2, characterized in that: The vegetation layer includes a vegetation concrete layer, planting soil and seaweed. The vegetation concrete layer and the reef frame are cast on the inverted filter layer using the same material. The planting soil is filled into the pores of the vegetation concrete layer. The rhizomes of the seaweed are fixed in the temporary planting soil at the beginning of the cultivation stage and are fixed on the vegetation concrete layer after the cultivation stage. The temporary planting soil is a planting soil layer laid on the vegetation concrete layer.

6. The reef device for constructing seagrass beds in special environments as claimed in claim 1, characterized in that: The thickness of the vegetation layer is at least greater than the length of the seaweed rhizomes to be planted.

7. The method for preparing and using a reef device for constructing a seagrass bed in a special environment according to any one of claims 1 to 6, characterized in that: The prepared reef device is placed in the breeding pond for the initial cultivation of seaweed transplantation. When the seaweed is completely fixed on the reef, the reef is placed in the designated placement area.

8. The method for preparing and using a reef device for constructing a seagrass bed in a special environment as claimed in claim 7, characterized in that: The preparation of the reef device includes the following steps: first, integrally cast the reef frame structure or cast the support frame and the base plate first, and then cast the vegetation space structure on the support frame; second, cut several biological channels and water flow channels on the support frame according to the design; third, apply a layer of waterproof paint on the inner wall of the vegetation space wall, and lay a filter layer on the base plate according to the designed thickness, and tamp the gravel to make it dense; then, prepare vegetation concrete, and pour it on the filter layer according to the designed thickness, and form a vegetation concrete layer after solidification; then, prepare planting soil, and fill it into the pores of the vegetation concrete layer; finally, lay temporary planting soil of a set thickness on the vegetation layer, and plant seaweed according to the set transplanting density.

9. The method for preparing and using a reef device for constructing a seagrass bed in a special environment as claimed in claim 7, characterized in that: The prepared reef device is hung in a breeding pond for cultivation. Seawater is introduced into the breeding pond and the water depth is controlled to exceed the set height of the overall height of the reef. During the cultivation process, when the water level drops due to evaporation, fresh water is added to maintain salinity stability. When the transplanted seaweed rhizomes develop and are fixed on the vegetation layer, the reef device can be deployed.

10. The method for preparing and using a reef device for constructing a seagrass bed in a special environment as claimed in claim 9, characterized in that: After the reef device is deployed, the growth of seagrass is continuously monitored. When the seagrass survival rate is lower than the set range due to force majeure, the substrate wrapping transplantation method is used for replanting. The transplanted plants are wrapped with a beneficial substrate and then placed on the reef vegetation layer.

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