Degradable multi-layered seagrass bed sediment carbon sequestration enhancement device

Abstract

The utility model discloses degradable multilayer seagrass bed sediment carbon sequestration enhancement device: including self -sinking formula composite structure main part, the composite structure main part has the scouring surface layer, slow -release nutrient module layer, microbial carrier layer and bottom quality anchoring layer from top to bottom in proper order, the scouring surface layer adopts three -dimensional weaving degradable fiber material to make, and the surface is distributed with water -permeable hole, three -dimensional weaving fiber structure of scouring surface layer mixes and spins basalt fiber reinforced filament and top hemispherical convex, can reduce 30% 40% water flow velocity, reduces sediment resuspension to reach 60% or above, effectively restrains the degradation of seagrass bed due to the water flow erosion. The hierarchical filtration design of water -permeable hole diameter 1 2 millimeter can not only keep 0.5 millimeter below fine particle sediment beneficial to seagrass seedling bed, but also can block coarse sand and block the lower structure, forms " anti -erosion - bottom quality " double protective layer.

Description

Technical Field

[0001] This utility model relates to carbon in seagrass bed sediments, specifically a biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device. Background Technology

[0002] Insufficient resistance to erosion and protection of seabed: Traditional devices use a single material and have a simple structure, with a water flow velocity reduction rate of only 10%-20%. Coarse sand easily clogs the pores, resulting in a low implantation rate of seaweed seedlings and poor aging resistance, making it difficult to provide long-term stable protection.

[0003] Nutrient supply is inefficient and risky: the loss rate of fertilizers applied by artificial seeding exceeds 60%, which can easily lead to eutrophication; the degradation cycle of existing slow-release materials does not match the growth of seagrass, and the increase in root biomass is limited.

[0004] Defects of microbial regulation carriers: lack of efficient habitat carriers, low inoculation density and poor survival rate of microbial communities, sulfide degradation efficiency of less than 40%, and inability to stably maintain the anaerobic environment required for carbon sequestration.

[0005] Issues related to the integration of materials and ecology: Non-degradable material residues affect seagrass growth, while periodic misalignment of degradable materials leads to root damage; the anchoring structure has weak resistance to currents, and the device has a high displacement rate.

[0006] Limitations of engineering applications: Installation relies on large machinery, resulting in high costs and low efficiency; fixed parameters make it difficult to adapt to complex sea conditions; and operation and maintenance costs account for more than 40%.

[0007] To address the aforementioned shortcomings, this solution systematically solves the problem of low carbon sequestration efficiency caused by seagrass bed degradation through three-dimensional structural design, functional layer synergy, and material cycle matching, providing an environmentally friendly and cost-effective innovative solution for blue carbon ecological restoration. Utility Model Content

[0008] The technical problem to be solved by this invention is to overcome the defects of the above-mentioned technology and provide a biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device.

[0009] To solve the above-mentioned technical problems, the technical solution provided by this utility model is a biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device: it includes a self-sinking composite structure main body, which is provided with an anti-erosion surface layer, a slow-release nutrient module layer, a microbial carrier layer and a bottom sediment anchoring layer from top to bottom; the anti-erosion surface layer is made of three-dimensional woven biodegradable fiber material and has water-permeable pores distributed on the surface;

[0010] The sustained-release nutrient module layer contains sustained-release particles coated with polylactic acid;

[0011] The microbial carrier layer has a honeycomb porous structure and is loaded with desulfurization bacteria and Bacteroidetes microbial communities inside.

[0012] Anchoring teeth are provided on the bottom surface of the substrate anchoring layer.

[0013] As an improvement, the three-dimensional woven fiber material of the anti-erosion surface layer is mixed with basalt fiber reinforcing filaments, and the water-permeable pores are uniformly arranged; the slow-release granules of the slow-release nutrient module layer contain nitrogen, phosphorus and potassium compound fertilizer with a mass ratio of N:P:K = 14:14:14, and the degradation cycle of the coating material is 60-90 days.

[0014] The inoculation density of the microbial community is 1×10⁻⁶. 7 CFU / g carrier material.

[0015] As an improvement, the anchoring teeth of the substrate anchoring layer have an inverted triangular pyramidal structure.

[0016] As an improvement, the top surface of the erosion-resistant surface layer is provided with hemispherical protrusions, the interior of which is filled with calcium carbonate whiskers; a breathable separator membrane is provided between the slow-release nutrient module layer and the microbial carrier layer, the separator membrane being made of cellulose nanofibers with a breathability of 50-100 mL / (m²). 2 •s); The overall degradation cycle of the main body of the composite structure is 12-18 months, which is synchronized with the expansion cycle of the seagrass root system.

[0017] The advantages of this invention compared to existing technologies are: synergistic effect of ecological protection and carbon sequestration.

[0018] Three-dimensional erosion resistance and sediment stabilization: The three-dimensional woven fiber structure of the erosion-resistant surface, reinforced with basalt fiber and featuring hemispherical protrusions on the top surface, reduces water flow velocity by 30%-40% and decreases sediment resuspension by over 60%, effectively curbing seagrass bed degradation caused by water erosion. The tiered filtration design with permeable pores of 1-2 mm diameter retains fine sediment particles smaller than 0.5 mm, facilitating seagrass seedling implantation, while preventing coarse sand from clogging the underlying structure, forming a dual protective layer of "erosion resistance and bottom sediment retention."

[0019] Targeted slow-release nutrition and precise supply: The polylactic acid-coated slow-release granules of the slow-release nutrient module layer have a degradation cycle of 60-90 days, achieving a uniform release of 0.5-1 mg / cm² / day of nitrogen, phosphorus, and potassium (N:P:K = 14:14:14), reducing nutrient loss by 40% compared to traditional fertilizer application and preventing localized eutrophication. Nutrients diffuse directionally to the microbial carrier layer and substrate through the 0.2-0.5 micrometer pore size of the breathable separator membrane, increasing seagrass root absorption efficiency by 35% and root biomass by 25% compared to the control group, significantly enhancing seagrass's carbon fixation capacity.

[0020] Microbial regulation optimizes the carbon sequestration environment: the honeycomb porous structure of the microbial carrier layer has a porosity ≥70% and is composed of desulfurizing bacteria and Bacteroidetes, with an inoculation density of 1×10⁻⁶.7 CFU / g provides an efficient habitat, degrading over 60% of harmful sulfides in sediments, stabilizing the redox potential in the -100 to -50 mV anaerobic range, and promoting the sequestration of organic carbon in solid form, increasing sequestration efficiency by 40% compared to the natural state. Simultaneously, extracellular polymers produced by microbial metabolism increase the diameter of sediment particle aggregates by 2-3 times, further reducing carbon release into the water. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device of this utility model. Figure 1 .

[0022] Figure 2 This is a three-dimensional structural diagram of the biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device of this utility model. Figure 2 . Detailed Implementation

[0023] To facilitate understanding of this application, a more complete description will be provided below with reference to the accompanying drawings, which illustrate embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of this application will be thorough and complete.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0025] It is understood that spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., can be used here to describe the relationship between one element or feature shown in the figure and other elements or features. It should be understood that, in addition to the orientation shown in the figure, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figure is flipped, the element or feature described as "below" or "under" or "below" of the other element or feature will be oriented "over" the other element or feature. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations, such as being rotated 90 degrees or other orientations, and the spatial descriptive terms used herein will be interpreted accordingly.

[0026] It should be noted that when one element is considered to be "connected" to another element, it can be directly connected to the other element or connected to the other element through an intermediary element. In the following embodiments, "connection" should be understood as "electrical connection," "communication connection," etc., if the connected circuits, modules, units, etc., have the transmission of electrical signals or data between them.

[0027] When used herein, the singular forms of “a,” “an,” and “the” may also include the plural forms unless the context clearly indicates otherwise. It should also be understood that the terms “comprising,” “including,” or “having,” etc., specify the presence of the stated feature, whole, step, operation, component, part, or combination thereof, but do not preclude the possibility of the presence or addition of one or more other features, wholes, steps, operations, components, parts, or combinations thereof.

[0028] Referring to the attached figures, the biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device includes a self-sinking composite structure main body 1. The composite structure main body 1 is provided with an anti-erosion surface layer 11, a slow-release nutrient module layer 12, a microbial carrier layer 13, and a bottom sediment anchoring layer 14 from top to bottom. The anti-erosion surface layer 11 is made of three-dimensional woven biodegradable fiber material, and the surface is distributed with water-permeable holes 111.

[0029] The sustained-release nutrient module layer 12 includes sustained-release particles 121 coated with polylactic acid;

[0030] The microbial carrier layer 13 has a honeycomb porous structure and is loaded with desulfurized bacteria and Bacteroidetes microbial community 131 inside.

[0031] Anchoring teeth 141 are provided on the bottom surface of the substrate anchoring layer 14.

[0032] As an improvement, the three-dimensional woven fiber material of the erosion-resistant surface layer 11 is mixed with basalt fiber reinforcing filaments 112, and the water-permeable pores 111 are uniformly arranged; the slow-release granules 121 of the slow-release nutrient module layer 12 contain nitrogen, phosphorus and potassium compound fertilizer, with a mass ratio of N:P:K = 14:14:14, and the degradation cycle of the coating material is 60-90 days;

[0033] The inoculation density of the microbial community 131 is 1×10⁻⁶. 7 CFU / g carrier material.

[0034] As an improvement, the anchoring teeth 141 of the substrate anchoring layer 14 have an inverted triangular pyramidal structure.

[0035] As an improvement, the top surface of the erosion-resistant surface layer 11 is provided with hemispherical protrusions 113, the protrusions 113 being filled with calcium carbonate whiskers; a breathable separator membrane 18 is provided between the slow-release nutrient module layer 12 and the microbial carrier layer 13, the separator membrane 18 being made of cellulose nanofibers with a breathability of 50-100 mL / (m 2 ·s); The overall degradation cycle of the composite structure 1 is 12-18 months, which is synchronized with the seagrass root expansion cycle.

[0036] I. Preparations before installation:

[0037] Site selection and environmental survey:

[0038] First, conduct a bottom sediment survey of the target sea area, such as estuaries, lagoons, or degraded shallow seagrass beds. Use side-scan sonar or underwater exploration to determine the sediment type, preferably silty clay or muddy sediment. The water depth should be between 1-5 meters to ensure that the hemispherical protrusion 113 on the top surface of the erosion-resistant surface layer 11 does not protrude above the water surface at low tide, thus preventing accelerated material degradation due to ultraviolet radiation. Use a GPS locator to mark installation points, with a spacing of 1.5-2 meters to ensure water flow connectivity between devices while avoiding overlap of nutrient release areas in the slow-release nutrient module layer 12.

[0039] Pretreatment of the device:

[0040] Remove the main composite structure 1 from the moisture-proof transport box and check the integrity of each layer: the permeable holes 111 of the erosion-resistant surface layer 11 must be unblocked, and the basalt fiber reinforcing filaments 112 blended in the three-dimensional woven fiber must be unbroken; the inverted triangular cone anchoring teeth 141 of the bottom anchoring layer 14 must be undeformed. Gently press the tip of the anchoring tooth by hand to ensure that its hardness can penetrate the surface sediment to a compaction level of about 2-3 cm. When temporarily storing the device on the shore, it should be laid flat on the impermeable cloth to prevent the bottom anchoring layer 14 from contacting mud and sand, which could cause the anchoring teeth 141 to become contaminated with debris.

[0041] II. Device placement and fixation:

[0042] Self-sinking submersion operation:

[0043] The composite structure is transported to the designated location by barge or raft. It is then lowered to the water surface at a uniform speed using nylon ropes (8-10 mm in diameter, with a load capacity of ≥50 kg) secured to the edge of the erosion-resistant surface 11 of the main body 1, avoiding the area around the permeable holes 111. The density of the main body 1 is designed to be 1.05-1.1 g / cm³. 3 Slightly denser than seawater, the device will automatically and slowly sink after entering the water. During the sinking process, observe whether it remains horizontal. If it tilts more than 15°, adjust the position of the suspension rope to correct it.

[0044] Substrate anchoring and fixing:

[0045] When the device comes into contact with seabed sediment, operators confirm the adhesion between the bottom anchoring layer 14 and the seabed using diving or an underwater robot. Using specialized ballast tools, such as hydraulic jacks with rubber pads, light pressure is applied to the top surface of the erosion-resistant surface layer 11 to ensure the anchoring teeth 141 are inserted 5-8 cm into the seabed. The inverted triangular cone is designed with a cone height of 10 cm to ensure that the exposed portion after insertion is ≤5 cm, avoiding interference with seagrass root expansion. The insertion depth of the anchoring teeth 141 at each of the four corners of the device must be checked for consistency, with an error not exceeding 1 cm.

[0046] III. Functional Layer Collaborative Operation Process of the Device:

[0047] Working mechanism of anti-erosion surface layer 11:

[0048] After the device is installed, when water flows through the erosion-resistant surface layer 11, the hemispherical protrusions 113 on the top surface, 2 cm high and 3 cm in diameter, first disrupt the laminar flow, reducing the flow velocity by 30%-40%. Hydrodynamic simulations have verified this, reducing sediment resuspension. The permeable holes 111, 1-2 mm in diameter and 5 mm apart, are evenly arranged to allow suspended particles ≤0.5 mm in diameter to pass through, while blocking large silt particles to prevent clogging of the underlying structure. The basalt fiber reinforcing yarns 112, blended at 15%, provide structural support under water impact, preventing excessive deformation of the fiber material and ensuring the erosion resistance continues until the overall degradation cycle of 12-18 months.

[0049] Slow-release nutrient module layer 12 nutrient release:

[0050] When seawater seeps into the slow-release nutrient module layer 12 through the permeable holes 111, the polylactic acid coated slow-release particles 121 have a particle size of 2-3 mm and a bulk density of 0.8 g / cm³. 3 It begins to absorb moisture and expand. The coating material, 0.1-0.2 mm thick, gradually degrades under seawater erosion, completing nutrient release within 60-90 days. The N:P:K compound fertilizer (N:P:K = 14:14:14) slowly dissolves at a rate of 0.5-1 mg / cm² per day, separated by a breathable 18-cellulose nanofiber membrane with a permeability of 50-100 mL / (m²). 2 The micropores of ·s) with a diameter of 0.2-0.5 micrometers are evenly diffused into the microbial carrier layer 13 and the substrate, promoting the absorption of seagrass roots, especially widely distributed species such as eelgrass and Tylosus, while avoiding excessive release of nutrients in a short period of time that could lead to algal blooms.

[0051] Metabolic activity of microbial carrier layer 13:

[0052] The honeycomb-like porous structure has a pore size of 5-10 mm and a porosity ≥70%, and contains desulfurization bacteria and Bacteroidetes microorganisms. The inoculation density is 1×10⁻⁶. 7The CFU / g carrier material provides habitat. Microorganisms decompose organic carbon in the sediment, producing extracellular polymers that promote particle aggregation. Simultaneously, desulfurizing bacteria degrade sulfides, a common inhibitory factor in seagrass beds, converting them into elemental sulfur or sulfate, lowering the sediment redox potential to a target range of -100 to -50 mV, creating an anaerobic environment conducive to carbon sequestration. The breathable separator membrane 18 allows limited permeability with oxygen concentrations ≤2 mg / L, maintaining the aerobic-anaerobic transition zone for microorganisms and optimizing metabolic efficiency.

[0053] Long-term stabilizing effect of substrate anchoring layer 14:

[0054] The inverted triangular cone anchoring tooth 141 has a base side length of 3 cm and a cone angle of 60°. After being inserted into the substrate, its inclined design effectively resists the horizontal drag force generated by tidal currents and is calculated to withstand continuous scouring at a flow velocity of 0.5 m / s. Over time, seagrass roots grow from the periphery of the device towards the substrate anchoring layer 14. After 12-18 months, the main root diameter ≥1 mm can wrap around the anchoring tooth 141, forming a biological-mechanical dual anchoring structure. At this time, the main body 1 of the composite structure begins to degrade. The three-dimensional woven fibers and polylactic acid coating gradually decompose into CO2 and water, while calcium carbonate whiskers fill the hemispherical protrusion 113 and slowly dissolve, releasing Ca. 2+ This promotes the synthesis of seaweed cell walls and achieves a cycle synchronization error of ≤15 days between device degradation and seaweed root expansion.

[0055] IV. Monitoring and maintenance during use:

[0056] Regular inspection cycle:

[0057] For the first month after installation, the device will be inspected weekly by diving, and then monthly thereafter. The main observations will be:

[0058] If the erosion-resistant surface 11 has a large algae coverage rate >30%, it needs to be cleaned with a soft brush to avoid clogging the permeable holes 111;

[0059] If the exposed part of the anchoring tooth 141 is loosened and the displacement is greater than 5 cm due to the bottom erosion, additional ballast sandbags are required. Each bag weighs 10-15 kg and should be placed within 50 cm of the device.

[0060] The N and P concentrations of seawater in zone 12 of the slow-release nutrient module were measured using a portable multi-parameter water quality analyzer. Target value: NH4. + -N 0.5-1.0 mg / L, PO4 3- -P 0.05-0.1 mg / L. When the concentration exceeds the range, the nutrient distribution can be optimized by adjusting the spacing between adjacent devices.

[0061] Microbial activity assessment:

[0062] Sediment samples were collected quarterly from below the device using a 10 cm diameter sediment column sampler at a depth of 20 cm. The abundance of microbial community 131 was determined using quantitative real-time PCR, with a target value ≥5 × 10⁻⁶. 6 CFU / g dry weight. If the number of desulfurized bacteria decreases by more than 20%, supplement the inoculation density of the bacterial agent with a diameter of 5 mm through the pre-reserved injection hole on the top surface of the device hidden in the gap of the hemispherical protrusion 113, and ensure the carbon sequestration efficiency remains stable.

[0063] V. Device Degradation and Ecological Integration:

[0064] Approximately 12 months after the main body 1 of the composite structure enters the late stage of degradation, the fibers of the erosion-resistant surface layer 11 begin to break. At this point, the seaweed coverage should reach over 60%, as monitored by drone remote sensing. The average leaf length should be ≥30 cm, and the root network should completely cover the bottom area of ​​the device with a root density ≥5 roots / cm². 2 The small organic molecules produced by the degradation of the device, such as lactic acid monomers, are used as carbon sources by seaweed and microorganisms and eventually decompose completely within 18 months. The remaining basalt fiber reinforcing filaments 112 have a degradation cycle of 24 months. Due to their small size (10 micrometers in diameter) and non-toxicity, they can exist in the sediment for a long time. Tests showed that they have no inhibitory effect on seaweed growth and have a germination rate of >95%, which is consistent with the control group.

[0065] Example Table:

[0066]

[0067] Synergistic Effects of Ecological Protection and Carbon Sequestration:

[0068] Three-dimensional erosion resistance and sediment stabilization: The three-dimensional woven fiber structure of the erosion-resistant surface layer 11, reinforced with basalt fiber filaments 112 and hemispherical protrusions 113 on the top surface, can reduce water flow velocity by 30%-40% and reduce sediment resuspension by more than 60%, effectively curbing the degradation of seagrass beds caused by water erosion. The graded filtration design of the permeable holes 111 with a diameter of 1-2 mm can retain fine sediment particles smaller than 0.5 mm to facilitate the implantation of seagrass seedlings, while preventing coarse sand from clogging the lower structure, forming a double protective layer of "erosion resistance and bottom sediment protection".

[0069] Targeted slow-release nutrition and precise supply: The polylactic acid-coated slow-release particles 121 of the slow-release nutrient module layer 12 have a degradation cycle of 60-90 days, achieving a uniform release of 0.5-1 mg / cm² / day of nitrogen, phosphorus, and potassium (N:P:K) at a ratio of 14:14:14. This reduces nutrient loss by 40% compared to traditional fertilizer application, preventing localized eutrophication. Nutrients diffuse directionally through the 0.2-0.5 μm pores of the breathable separator membrane 18 to the microbial carrier layer 13 and the substrate, increasing seagrass root absorption efficiency by 35% and root biomass by 25% compared to the control group, significantly enhancing seagrass's carbon fixation capacity.

[0070] Microbial regulation optimizes the carbon sequestration environment: the honeycomb porous structure of microbial carrier layer 13 has a porosity ≥70% and is composed of desulfurizing bacteria and Bacteroidetes phylum 131. The inoculation density is 1×10⁻⁶. 7 CFU / g provides an efficient habitat, degrading over 60% of harmful sulfides in sediments, stabilizing the redox potential in the -100 to -50 mV anaerobic range, and promoting the sequestration of organic carbon in solid form, increasing sequestration efficiency by 40% compared to the natural state. Simultaneously, extracellular polymers produced by microbial metabolism increase the diameter of sediment particle aggregates by 2-3 times, further reducing carbon release into the water.

[0071] Material degradation synchronized with ecological cycles:

[0072] Environmentally friendly material design: The main body of the composite structure 1 uses fully biodegradable materials: three-dimensional woven fibers degrade in 12-18 months, and the polylactic acid coating decomposes into CO2 and water in 60-90 days. Calcium carbonate whiskers fill the protrusions 113, releasing Ca. 2 + It can promote the synthesis of seaweed cell walls and realize the material cycle of "material degradation - seaweed growth". The remaining basalt fiber reinforcing filaments 112 with a diameter of 10 micrometers are small in size and non-toxic. Tests have shown that they have no effect on the seaweed germination rate (>95%), avoiding plastic residue pollution from traditional artificial devices.

[0073] Long-term stability through dual biological and mechanical anchoring: After the inverted triangular cone anchoring teeth 141 of the bottom anchoring layer 14 with a cone angle of 60° are inserted into the bottom, they can withstand continuous scouring at a flow rate of 0.5 m / s, increasing the drag resistance by 50% compared to traditional flat-plate anchoring structures. As the seagrass roots wrap around the anchoring teeth for 12-18 months to form biological anchoring, the risk of device displacement is reduced by 80%, achieving a seamless transition from "initial mechanical fixation to later biological replacement," avoiding a decrease in carbon sequestration efficiency due to device displacement.

[0074] Advantages of engineering applications:

[0075] Easy installation and low-cost maintenance: Self-sinking design with a density of 1.05-1.1 g / cm³ 3 No additional counterweight is required, and the tilt during the sinking process can be corrected in real time with a ≤15° error via the hoisting rope, reducing the installation time of a single device to less than 10 minutes. The monitoring and maintenance cycle is flexible: weekly inspections in the first month, followed by monthly inspections. Portable water quality analyzers are used to detect N / P concentrations, and quantitative PCR is used to monitor bacterial abundance for precise assessment of functional status, reducing operation and maintenance costs by 30% compared to traditional seagrass restoration projects.

[0076] Improved adaptability and versatility: The device is suitable for silty clay / muddy seabeds with water depths of 1-5 meters. By adjusting the insertion depth of the anchoring teeth (5-8 cm) and the spacing between devices (1.5-2 meters), it can adapt to seagrass bed restoration scenarios with different tidal intensities (semi-diurnal, diurnal) and current velocities (0.2-0.8 m / s). Field measurements show that after use in degraded seagrass bed areas, seagrass coverage increased by an average of 20%-30% annually, and sediment organic carbon content increased by 15%-20%, significantly outperforming similar structureless reinforcement devices.

[0077] Support for the carbon neutrality goal:

[0078] Through the synergistic effect of multiple layers of the device, a single standard-sized device (1m×1m×0.2m) can enhance sediment carbon sequestration by 0.8-1.2 tons / hectare per year. Combined with its effective cycle of 12-18 months, the carbon sequestration capacity of a single hectare of seagrass bed is increased by 35%-45% compared to the natural state. This technology complements the natural carbon sequestration process of seagrass, providing a replicable and easily scalable engineering solution for carbon sequestration in coastal wetlands, and contributing to the protection and restoration of blue carbon ecosystems under the "dual carbon" goal.

[0079] The present invention and its embodiments have been described above. This description is not restrictive, and the accompanying drawings are only one embodiment of the present invention; the actual structure is not limited thereto. In conclusion, if those skilled in the art are inspired by this description and design similar structures and embodiments without departing from the inventive spirit of the present invention, such designs should fall within the protection scope of the present invention.

Claims

1. A biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device, characterized in that: The structure includes a self-sinking composite main body (1), which is provided with an anti-erosion surface layer (11), a slow-release nutrient module layer (12), a microbial carrier layer (13), and a substrate anchoring layer (14) from top to bottom; the anti-erosion surface layer (11) is made of three-dimensional woven biodegradable fiber material and has water-permeable holes (111) distributed on its surface. The sustained-release nutrient module layer (12) contains sustained-release particles (121) coated with polylactic acid; The microbial carrier layer (13) has a honeycomb porous structure and is loaded with desulfurized bacteria and Bacteroidetes microbial communities (131). Anchoring teeth (141) are provided on the bottom surface of the substrate anchoring layer (14).

2. The biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device according to claim 1, characterized in that: The three-dimensional woven fiber material of the erosion-resistant surface layer (11) is mixed with basalt fiber reinforcing filaments (112), and the water-permeable pores (111) are uniformly arranged; the slow-release nutrient module layer (12) contains nitrogen, phosphorus and potassium compound fertilizer with a mass ratio of N:P:K = 14:14:14, and the degradation cycle of the coating material is 60-90 days; The inoculation density of the microbial community (131) was 1×10⁻⁶. 7 CFU / g carrier material.

3. The biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device according to claim 2, characterized in that: The anchoring teeth (141) of the substrate anchoring layer (14) have an inverted triangular pyramid structure.

4. The biodegradable multi-layer seagrass bed sediment carbon sequestration enhancement device according to claim 3, characterized in that: The top surface of the erosion-resistant surface layer (11) is provided with hemispherical protrusions (113), and the interior of the protrusions (113) is filled with calcium carbonate whiskers; a breathable separator membrane (18) is provided between the slow-release nutrient module layer (12) and the microbial carrier layer (13), and the separator membrane (18) is made of cellulose nanofibers with a breathability of 50-100 mL / (m 2 ·s); The overall degradation cycle of the composite structure (1) is 12-18 months, which is synchronized with the seagrass root expansion cycle.

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