48 results about "Wetland soils" patented technology

The invention relates to the technical field of ecological environment monitoring and geographic information, in particular to a coastal wetland soil sample point quality evaluation method and system based on multi-source environmental data. According to the method, remote sensing, climate, terrain, ocean and historical land coverage data are fused, and indexes are extracted and standardized; an environment similarity score (weighted Markov / neighbor weighted Euclidean), a historical consistency score (multi-temporal coverage + transfer penalty) and a source reliability score (metadata integrity + anomaly detection + NDVI-SOC residual) are constructed respectively; comprehensive scores are obtained through self-adaptive weight fusion, A / B / C grades are divided, and a report and a high-quality sample point set are output. The system comprises a data access module, a scoring engine module and a visualization module, and the precision and robustness of soil mapping and carbon storage evaluation can be remarkably improved.

The invention discloses a method and system for predicting methane emission flux based on a data coupling model, and the method comprises the steps: downloading remote sensing, soil, hydrology, observation and meteorological data of a target wetland region, and carrying out the data preprocessing; the TECO model and the Wetland-DNDC model are coupled, and hourly underground water level data output by the TECO model are transmitted to the DNDC model; preprocessing the wetland soil data, and calculating the water content change of the soil profile; operating the coupling model, and simulating methane generation, oxidation and emission; based on actually measured data, assimilating and optimizing key parameters by adopting Bayesian data, quantifying uncertainty through Monte Carlo simulation, and performing methane emission flux prediction data; and finally, carrying out precision verification on a prediction result and an actual measurement result. According to the method, high-precision prediction of the wetland methane emission flux is realized through the coupling model.

Various examples are provided related to root system analysis of a three-dimensional (3D) volume of a soil core sample. In one example, a method for root system analysis of a three-dimensional (3D) volume of a soil core sample includes normalizing image slices of an x-ray computed tomography (XCT) scan of the soil core sample and segmenting image slices of the XCT scan by clustering image features using Gaussian Mixture Model (GMM). The method further includes training a random forest (RF) model using the segmented image slices and in response to accuracy of the trained RF model satisfying a threshold condition, segmenting the 3D volume of the soil core sample using the trained RF model.

The invention relates to the technical field of wetland soil collection, and discloses a wetland soil collection and detection system, which comprises: a sampling mechanism, which comprises a sampling pipe, a ball valve assembly and a hydraulic driving assembly; the sampling pipe is used for feeding a soil sample into wetland soil and storing the soil sample; the ball valve assembly is arranged at the lower end of the sampling pipe and is used for providing lower end support for a collected soil sample; the hydraulic driving assembly is used for providing feeding driving force for the sampling pipe and controlling the feeding speed and pressure of the sampling pipe; the monitoring and analyzing module comprises a monitoring unit and an analyzing unit, and the monitoring unit is used for collecting pressure data borne by the sampling pipe in the feeding process. Through cooperative control of hydraulic driving and intelligent feedback, the sample fidelity problem in wetland soil sampling is solved. A dynamic pressure sensing and self-adaptive adjusting mechanism is adopted, so that accurate sampling control on soil with different flowability is realized.

The application discloses a tidal flow artificial wetland tail water sediment secondary degradation device and a use method, and belongs to the technical field of tidal flow wetland sediment treatment. The device comprises a rigid support and a rotating motor. The top of the rigid support is supported by a rigid supporting plate, and a tail end plate is installed on the rigid supporting plate. A plurality of telescopic mechanisms are installed on the rigid supporting plate. The rotating motor is suitable for driving the plurality of telescopic mechanisms to extend and retract. The output end of the plurality of telescopic mechanisms is provided with a scraper, and the scraper moves on the rigid supporting plate. The rigid supporting plate is arranged to be inclined, and a mounting notched plate is arranged on the side away from the tail end plate. The device further comprises a stirring motor, which is installed in the mounting notched plate. The bottom of the stirring motor is provided with a slurry conveying part, which pumps the stirred slurry to the surface of the wetland soil layer. The application can ensure that the urban tail water can be fully degraded twice by stirring or depositing the mixture in the tidal water flow during the rising tide and the falling tide of the tidal flow artificial wetland, and then conveying the mixture back to the wetland.

The utility model relates to the technical field of wetland soil sampling, in particular to a wetland soil sampling device which comprises an inner cylinder, an outer cylinder, a piston, a push rod, a cutting locking structure and an inflating structure, the inner cylinder is arranged on the inner side of the outer cylinder, the inner cylinder and the outer cylinder are coaxially arranged, the upper end of the outer cylinder is closed, and the piston is arranged on the piston. The push rod movably penetrates through the middle of the upper end of the outer cylinder and extends into the inner cylinder, the piston is arranged in the inner cylinder in a sliding mode and fixed to the lower end of the push rod, the lower end of the inner cylinder is located on the inner side of the outer cylinder, and the space between the lower end of the inner cylinder and the outer cylinder is closed. The cutting locking structure comprises air bags and first cutting blades, the at least three air bags are distributed on the inner side of the outer cylinder in an annular array mode in an up-down staggered mode, one sides of the air bags are fixedly connected with the inner wall of the outer cylinder, the first cutting blades are fixed to the other sides of the air bags, and one ends of the first cutting blades are rotationally arranged. And the air inflation structure is used for inflating the air bag.

The utility model relates to the field of soil detection, in particular to a desert wetland soil evaporation capacity detection device. The desert wetland soil evaporation capacity detection device provided by the utility model can be used for detecting the moisture of soil in the evaporation dish while detecting the moisture of soil at different depths, is convenient to compare, improves the accuracy and reliability of detection and is convenient to use. A desert wetland soil evaporation capacity detection device comprises a placement table, insertion rods and the like, and the left and right parts of the placement table are connected with the front and rear insertion rods. Changes of soil moisture in the evaporation dish are measured at regular time through the weighing device and recorded, meanwhile, the soil moisture sensor is moved to different depths to detect and record the moisture in the soil, and then the evaporation capacity is calculated through data comparison. Therefore, moisture of soil in the evaporation pan can be detected while moisture of soil at different depths is detected, comparison is facilitated, detection accuracy and reliability are improved, and use is convenient.

The utility model discloses a multifunctional ecological unit riparian zone structure for reducing runoff pollution. The multifunctional ecological unit riparian zone structure comprises a green land unit arranged on a high land on the bank side, a gabion unit arranged on a side slope and a water side wetland unit arranged beside a river water body. The greenbelt unit comprises a soil layer, and an ecological plant layer is arranged on the surface of the soil layer; the gabion unit comprises four gabion units, the bottom of the first gabion unit and the bottom of the second gabion unit are located at the same height, and the contact portions of the first gabion unit and the second gabion unit form a viscous flow zone. A 10% first slope is arranged at the top of the second gabion unit, and a controllable water outlet is formed in the bottom of the second gabion unit; and the waterside wetland unit comprises wetland soil and emergent aquatic plants planted in the wetland soil. By optimizing the water flow path and organically combining the multifunctional ecological units, pollutants in rainwater runoff can be efficiently reduced, meanwhile, the ecological function of a riparian zone is recovered, and the water quality purification capacity, the landscape function and the ecological system service capacity of the riparian zone are improved.

The application discloses a kind of wetland protection monitoring equipment, it includes: monitoring column frame, vertical erection is set on wet area soil, the lower portion of the monitoring column frame is fixed with mounting disc, the mounting disc is fixed on ground by multiple insertion rods horizontally;Soil detection component is multiple, and is distributed in circumference, and mixing and conveying device is fixed on the monitoring column frame, and is connected with each soil detection component, the mixing and conveying device can be in wetland soil monitoring to the wetland soil conveyed in one or more soil detection components on the upper conveying;Inspection unmanned aerial vehicle;Unmanned aerial vehicle carries and releases frame, horizontal erection is set on the upper end surface side of the monitoring column frame, for the takeoff of inspection unmanned aerial vehicle, the inspection unmanned aerial vehicle can be sent to the wetland soil sample conveyed in mixing and conveying device;Temperature and humidity monitoring device is installed on the monitoring column frame;And power solar panel is fixed on the monitoring column frame with inclination.

The invention relates to the technical field of surveying and mapping systems, and discloses a wetland territorial surveying and mapping support system based on a multi-angle rotating structure, which comprises a mounting seat, the edge of the lower end of the mounting seat is uniformly and rotatably connected with a supporting mechanism through a connecting seat, and the lower end of the mounting seat is connected with a locking mechanism, the supporting mechanism comprises round rods symmetrically and fixedly connected to the lower end of the connecting base, the lower ends of the two round rods are jointly and rotationally connected with a limiting base, supporting legs are slidably connected to the limiting base, and ground anchors are fixedly connected to the lower ends of the supporting legs. The wetland territorial surveying and mapping support system based on the multi-angle rotating structure can effectively solve the problems that in the prior art, wetland soil is loose, the water content is high, bearing is weak, the contact area of supporting legs of a conventional surveying and mapping support is small, local pressure intensity exceeds the soil limit, sinking is prone to occurring, and supporting is damaged; and simple base plates additionally arranged on part of the bracket and supporting legs are not effectively fixed and are easy to slide, so that the posture of an instrument is deviated and the surveying and mapping precision is influenced.

The present invention provides a method for estimating the soil organic carbon content of wetlands with different restoration years, which relates to the field of wetland carbon sink accounting technology. The method includes: setting up multiple sampling points within the target study area and collecting soil samples; preprocessing satellite image data and determining a first input feature, and determining a second input feature based on the geographic coordinates of the sampling points, and inputting the above features into a regression prediction model to obtain a calculation result; generating a soil organic matter content data distribution based on the calculation result; using space instead of time, dividing sample areas with different restoration years based on land use history or restoration measures records, and within each sample area, statistically calculating the soil organic matter content and total amount based on the soil organic matter content data distribution to determine the soil organic carbon content of different restoration years. The present invention utilizes remote sensing technology and machine learning algorithms to achieve rapid and non-destructive estimation of wetland soil organic carbon content, reducing the workload and cost of field sampling.

The utility model belongs to the field of determination of wetland soil parameters, and particularly relates to a device suitable for coastal wetland soil respiration measurement, in particular to in-situ measurement equipment, which can be used for measuring the respiration of the coastal wetland soil without hindering the release effect of tidal water fluctuation on carbon dioxide in the coastal wetland soil. The interference of accumulated water in the breathing ring on a soil breathing measurement result after ebb tide is prevented. The device comprises a sealing device, a permeable ring, an indication cover and a fixing ring, the sealing device is composed of a stainless steel ring column with a built-in thread and an external hand lifting ring, and the hand lifting ring is fixedly connected with the stainless steel ring column in a welding mode. The permeable ring is composed of an external threaded stainless steel ring column with a hole, and is screwed with the sealer through threads; the indicating cover is composed of a stainless steel disc, and the indicating cover and the water permeable ring are fixedly connected in a welding mode. The fixing ring is composed of a stainless steel ring, and the fixing ring can be directly and completely inserted into soil to be detected.

The invention discloses a method for promoting carbon emission reduction and carbon fixation in wetland soil by using biochar and ferrihydrite, which comprises the following steps: mixing biochar, ferrihydrite and wetland soil to complete the treatment of the wetland soil. According to the method, the biochar and the ferrihydrite are added into the wetland soil, the combined soil improvement effect of the biochar and the ferrihydrite can be utilized, emission of methane and carbon dioxide is inhibited, the overall emission reduction effect of greenhouse gas is good, conversion of organic matter in the stable direction is promoted, and the carbon fixing amount and the carbon fixing effect are improved; and the double-carbon target can be realized. Meanwhile, the method for promoting carbon emission reduction and carbon immobilization in the wetland soil by utilizing the charcoal combined ferrihydrite has the advantages of simple process, convenience in operation, low cost, environmental friendliness and the like, and is convenient for industrial application, high in use value and good in application prospect.

The application discloses a kind of based on blue-green space pattern optimization comprehensive soil remediation method, belong to soil remediation field, especially relate to wetland soil, the remediation method is as follows: (1) the water level of wetland is reduced to lowest point and exposes wetland soil, so that wetland bed is in water unsaturated state;(2) in wetland soil, water floating purification particles are scattered, then covered with thin soil, and plants are planted;(3) after treatment time is greater than 30 days, water can be added or stored, and water floating purification particles are removed from the water surface, and the remediation is completed.The application solves the problem of wetland soil remediation difficulty, helps to improve the ecological benefits of blue-green space, and promotes regional sustainable development.

This invention relates to the fields of ecological environment monitoring and geographic information technology, and particularly to a method and system for quality assessment of coastal wetland soil sampling points based on multi-source environmental data. The method integrates remote sensing, climate, topography, marine, and historical land cover data, extracts and standardizes indicators, and constructs environmental similarity scores (weighted Mahalanobis / nearest neighbor weighted Euclidean), historical consistency scores (multi-temporal cover + migration penalty), and source reliability scores (metadata integrity + anomaly detection + NDVI-SOC residual). An adaptive weighted fusion is used to obtain a comprehensive score and classify the data into A / B / C levels, outputting a report and a high-quality sampling point set. The system includes data access, a scoring engine, and a visualization module, which can significantly improve the accuracy and robustness of soil mapping and carbon storage assessment.

The invention discloses a simulation observation device for coastal wetland soil micro-ecology research, which comprises an observation pool, a simulation wetland planting area, a tide simulation assembly, a wave simulation assembly and a soil sampling port, the simulation wetland planting area is arranged on one side of the interior of the observation pool, and specified to-be-observed plants are planted on the simulation wetland planting area; the other side of the interior of the observation pool is filled with simulated seawater with the horizontal plane lower than the simulated wetland planting area, the tide simulation assembly is arranged on the other side of the observation pool and comprises a piston push plate, and the wave simulation assembly is connected with the piston push plate and comprises a wave push plate and a reciprocating swing assembly. The soil sampling opening is formed in the surface of one side of the observation pool, and a sampling device is arranged in the soil sampling opening. The invention belongs to the technical field of ecological environment, and particularly relates to a simulation observation device for coastal wetland soil micro-ecology research.

The invention discloses an ecological restoration device for a damaged coastal wetland, and belongs to the field of wetland soil restoration. An ecological restoration device for a damaged coastal wetland comprises a vehicle body and further comprises a vehicle frame which is rotationally connected to the vehicle body, an adjusting piece for driving the vehicle frame to rotate is arranged on the vehicle body, a drill rod is installed on the vehicle body, at least two channels are formed in the drill rod, telescopic pipes are arranged in the channels, and the telescopic pipes are connected with the vehicle frame. The liquid outlet end of the telescopic pipe is fixedly communicated with a spray head; through cooperation of the driving part and the linkage part, the positions of the drill rod and the sleeve can be adjusted, soil of different depths can be remedied, meanwhile, in the remediation process, soil and stone can be separated, the diffusion range and quality of remediation liquid are improved, and when the drill rod and the sleeve are reset after remediation is completed, the negative pressure in a telescopic air bag in the injection part can improve the remediation effect. And ventilation of the positioning shell can be achieved, so that the heat dissipation effect on the second motor is achieved, and the service life of the second motor is prolonged.

This invention relates to the field of wetland ecological environment monitoring and greenhouse gas emission reduction technology, specifically to a method for assessing the impact of microplastics on methane emissions from wetland soils based on soil carbon composition. This invention assesses the degree of change in methane emissions from wetland soils after the addition of microplastics by measuring changes in the content of organic carbon components in the soil. Results show that, without relying on the detection of functional genes such as methanogens and methanogens, changes in the content of only two key carbon components—dissolved organic carbon and mineral-bound organic carbon—can accurately and quickly assess the direction and intensity of the impact of microplastics on methane emissions from wetland soils. This demonstrates the feasibility, scientific validity, and practicality of the method, providing a simple, efficient, and easily scalable new approach for assessing methane emissions from greenhouse gases under microplastic pollution stress in ecosystems.

The invention discloses a microbial community monitoring method, system and equipment for wetland soil, and relates to the technical field of microbial monitoring. The method comprises the following steps: acquiring an original monitoring spectrum of a target monitoring point in target wetland soil; correcting the original absorbance in the original monitoring spectrum based on the first calibration curve to obtain a first corrected spectrum; the first calibration curve is used for representing a change curve of the pure moisture simulated absorbance corresponding to each wavelength point along with the moisture content, and the first correction spectrum is used for representing a spectrum after moisture interference is removed; on the basis of the first test fluorescence intensity of each wavelength point at different moments under the humus change condition, correcting the original fluorescence intensity in the first correction spectrum to obtain a second correction spectrum; the humus content is linearly changed under the humus change condition, and the second correction spectrum is used for representing the spectrum after humus interference is removed; and carrying out spectral analysis on the second correction spectrum, and determining the activity indexes of various ecological functions in the target wetland soil.

The invention belongs to the technical field of ecological restoration, and particularly relates to an ecological floating bed and method for restoring sulfate saline-alkali wetland soil. The ecological floating bed comprises a combined floating bed and a hydraulic circulation system, the combined floating bed comprises a floating bed main body and magnetized water treatment equipment, and the salt-reducing and alkali-reducing effects of sulfate saline-alkali wetland soil are realized; the hydraulic circulation system comprises a siphon water pipe and a filtering device, and flowing of a sulfate saline-alkali wetland water body is achieved. By constructing a magnetic effect-microorganism-aquatic plant organic system, the environmental adaptability of microorganisms, the growth amount of aquatic plants and the enrichment capacity of a soil matrix are improved, the sulfate salt and alkali level in the environment is greatly reduced, and in-situ remediation of sulfate salt and alkali wetland soil is achieved; the defect of secondary pollution caused by an additional modifier can be effectively made up, and meanwhile the method has the advantages of being low in cost and wide in application range.

The present invention discloses a field light intensity control experimental device and its application. The device includes a culture chamber with adjustable light intensity, which includes two nested cylindrical lower-open chambers, a sampling tube, and a motor. The two cylindrical lower-open chambers are arranged with alternating transparent and opaque parts of the same shape and size. The sampling tube penetrates through the inner and outer cylindrical lower-open chambers, and the length of the lower end part is adjustable. The motor is arranged at the center of the top of the outer cylindrical lower-open chamber and can rotate the outer cylindrical lower-open chamber relative to the inner cylindrical lower-open chamber. A light intensity sensor is arranged in the inner cylindrical lower-open chamber, and a floating body and a still water ring can also be additionally connected according to needs. The present invention explores the influence of light intensity on the greenhouse gas emissions of the underlying surface by changing its own light transmission intensity. The overall structure is simple, the applicable range is wide, and the use cost is low. It is suitable for on-site light intensity control experiments in various sites such as flowing water bodies, static water bodies, and wetland soils.

The utility model relates to the technical field of soil sampling, and discloses a wetland soil collecting device for soil remediation, which comprises a sampling outer cylinder and an outer-layer blocking pipe, the outer-layer blocking pipe is positioned on the inner side of the sampling outer cylinder, and a bearing end is arranged at the bottom of the outer-layer blocking pipe. According to the utility model, soil sampling storage can be carried out between the sampling outer cylinder and the outer-layer blocking pipe, the sampling outer cylinder and the bearing end are sealed and borne, fluid soil loss is prevented, the telescopic sampling pipe can be used for deep soil collection, and the fan-shaped material blocking sheet is arranged at the bottom of the inner side of the telescopic sampling pipe and is matched with the fan-shaped material blocking sheet to coincide; the bottom of the telescopic sampling pipe is blocked, and the blocking rotating rod is rotated to drive the fan-shaped blocking sheets and the fan-shaped blocking sheets to be distributed in a staggered manner, so that soil collection and loss-prevention storage are facilitated, the device is used for collecting fluid soil, samples are not easy to lose, the storage effect is good, shallow soil and deep soil can be simultaneously collected, and the layered collection capability is excellent.

The present application relates to the technical field of wetland ecological restoration, and particularly relates to a nitrogen reduction, carbon fixation and emission reduction method for coastal wetlands based on iron cycle. The present application mixes biochar raw materials with water, and then performs hydrothermal reaction to obtain biochar precursors; the biochar precursors are immersed in a tannic acid modification solution to perform modification to obtain modified biochar precursors; and the modified biochar precursors are pyrolyzed under the condition of ferrocene vapor and inert atmosphere to obtain modified biochar. The present application uses green algae and cordgrass to prepare biochar, and realizes nitrogen reduction, carbon fixation and emission reduction of coastal wetlands based on iron cycle. After adding the modified biochar, the total nitrogen and greenhouse gas emission of the soil in the coastal wetland are reduced compared with those of the control group, and the total carbon content is increased.

The invention provides a method for enhancing anaerobic methane oxidation capacity of manganese oxide in wetland soil. The divalent iron salt is applied to the wetland soil containing the manganese oxide, so that the anaerobic methane oxidation capacity of the manganese oxide is improved. The methane anaerobic oxidation efficiency of manganese oxide in wetland soil can be obviously improved, the operation is simple, and the cost is low.

The utility model belongs to the technical field of wetland soil remediation, and particularly relates to a wetland soil remediation protection device which comprises a shell with an open top, a wind-up roller is rotatably arranged in the shell, a protection net is wound on the wind-up roller, when one end of the protection net is pulled, the protection net covers the passing wetland soil, and when the other end of the protection net is pulled, the other end of the protection net is pulled. A protective net is arranged on one side of the shell from outside to inside in a penetrating mode, an opening is further formed in one side of the shell from outside to inside in a penetrating mode, one end of the protective net movably penetrates through the opening from inside to outside, a cutter for cutting the protective net is further arranged above the opening, and a cross beam is transversely arranged on the outer wall of the shell. The protective net is wound in the shell through the winding roller, and when the protective net is pulled outwards, the protective net can conveniently cover the passing wetland soil, so that the wetland soil is protected through the protective net, and the soil is prevented from being scattered along with wind.

The invention discloses a device for sampling a soil seed bank of an urban small and micro wetland, which comprises a base body positioned in a land area; the movable rod assembly is installed on the base body and comprises a first movable rod, a second movable rod and a third movable rod, one end of the first movable rod is connected with the base body, one end of the second movable rod is movably connected with the other end of the first movable rod, and one end of the third movable rod is movably connected with the other end of the second movable rod; the sampling head is mounted at the other end of the third movable rod, the sampling head is used for stretching into a water area for sampling, and the first movable rod, the second movable rod and the third movable rod are matched with one another, so that the position of the sampling head can be adjusted in the X-axis direction, the Y-axis direction and the Z-axis direction. The device can be used for sampling the soil seed bank of the urban small and micro wetland, and can also be used for sampling multiple positions and multiple depths in a water area.

The invention provides a preparation method of a carbon-sequestration and sink-increasing wetland soil improvement material and an improvement material.The preparation method comprises the steps that reed biochar and acid-modified attapulgite are subjected to composite granulation, and functional components such as sepiolite, bentonite and a microbial agent are combined, so that a stable organic-inorganic complex can be formed through physical and chemical effects, and the carbon sequestration and sink-increasing wetland soil improvement material is obtained; the soil structure of the wetland is remarkably improved, the carbon immobilization capacity is improved, carbon emission is reduced, the improved material has high mechanical strength and a uniform pore structure, is convenient to apply and not prone to loss, is suitable for complex environments such as estuary wetlands, and the carbon sequestration function is improved, and resources are efficiently utilized.

This invention discloses a method and system for predicting methane emission flux based on a data coupling model. The method includes: downloading remote sensing, soil, hydrological, observational, and meteorological data from a target wetland area and performing data preprocessing; coupling the TECO model with the Wetland-DNDC model, and transmitting hourly groundwater level data output by the TECO model to the DNDC model; processing the wetland soil data to calculate changes in soil profile moisture content; running the coupled model to simulate methane generation, oxidation, and emission; optimizing key parameters using Bayesian data assimilation based on measured data, quantifying uncertainty through Monte Carlo simulation, and predicting methane emission flux data; and finally, verifying the accuracy of the predicted results against the measured results. Through the coupled model, the present invention achieves high-precision prediction of wetland methane emission flux.

The invention relates to the technical field of coastal wetland ecological restoration and improvement, in particular to a plant blanket, a preparation method and application of the plant blanket in coastal wetland ecological restoration. The plant blanket is of a three-layer composite structure comprising a lower high-density fiber layer, a middle mixed fiber layer and an upper sparse fiber layer. The middle mixed fiber layer is loaded with a composite modifier, and the composite modifier comprises biochar, a sepiolite-chitosan composite material, a water-retaining agent and coastal wetland soil, and is integrated with growth-promoting microbial agent microcapsules and salt-tolerant plant seeds. Through physical protection of the plant blanket, salt adsorption and soil improvement of biochar and sepiolite, fixation and slow-release energy supply of chitosan to microorganisms, and moisture regulation and control of the water-retaining agent, the purpose of improving the quality of the wetland in the coastal wetland area with dynamically changed tide and salt is achieved. And synergistic and efficient restoration of bank slope stabilization, soil improvement, microbial activity maintenance and vegetation restoration is realized. The method is convenient to construct and durable in repairing effect and has a good application prospect.

The invention relates to the technical field of wetland ecological restoration, in particular to a coastal wetland nitrogen reduction, carbon sequestration and emission reduction method based on iron circulation. The preparation method comprises the following steps: mixing a biochar raw material with water, and carrying out hydrothermal reaction to obtain a biochar precursor; immersing the biochar precursor into the tannic acid modification solution, and modifying to obtain a modified biochar precursor; under the condition of ferrocene steam and inert atmosphere, pyrolyzing the modified biomass precursor to obtain the modified biochar. According to the method, the biochar is prepared from enteromorpha and spartina alterniflora, nitrogen reduction, carbon sequestration and emission reduction of the coastal wetland are achieved on the basis of iron circulation, compared with control group soil, the total nitrogen and greenhouse gas emission of coastal wetland soil added with the modified biochar is reduced, and the total carbon content is increased.