931 results about "Edaphic" patented technology

The invention relates to the technical field of intelligent control, and discloses a water-saving fertilization variable control method suitable for sandy soil, and the method comprises the steps: obtaining collection data based on a sensor; and establishing and updating an infiltration-storage-leaching loss prediction model of the sandy soil according to the collected data, performing state estimation on soil moisture and nutrient states, and calculating root layer moisture deviation, fertilizer concentration deviation and deep seepage risk. And executing model predictive control in the rolling time domain to obtain a control result. And executing water-saving fertilization operation according to the control result. In the execution process, the soil volume moisture content, the soil water potential, the soil conductivity and shallow layer leakage observation data are fused, the prediction model is corrected, the control result is dynamically adjusted according to the correction result, and when the environment wind speed exceeds a set threshold value, the spray irrigation parameters are corrected. The fine level of control is improved, deep layer leakage can be inhibited under the sandy soil condition, water and fertilizer balance of a root layer is guaranteed, and external disturbance is coped with.

The invention provides a mining area surrounding soil heavy metal spatial distribution inversion method based on hyperspectral data, and the method comprises the steps: processing multi-source monitoring data of mining area surrounding soil, and obtaining a consistent reflectivity data set; performing soil spectrum purification based on the consistent reflectivity data set to obtain a pure soil signal; spectrum key features are screened out from the pure soil signals; obtaining a modeling data set in combination with the spectrum key features and the heavy metal concentration labels so as to construct a multi-task inversion model, and outputting each metal prediction interval and an over-standard risk probability graph; and outputting a multi-layer package based on the model, performing global and local interpretation and mechanism verification, and generating an interpretation report and traceable evidence. According to the method, full-link unification and purification can be achieved, domain deviation and mixed pollution are remarkably reduced, the accuracy and interpretability of feature screening can be considered, and the model generalization ability, prediction accuracy and space credibility are improved.

The invention relates to an organic matter near infrared spectrum inversion method and device for removing moisture based on radiation. The method comprises the steps that after a soil sample is pretreated, multiple moisture content gradients are regulated and controlled, the natural moisture permeation state is simulated, visible light-near infrared spectrum data and the organic matter content are collected, and a soil spectrum library is constructed; quantifying the interference weight of moisture on the spectrum by using a physical radiation transmission model to obtain a preliminary correction spectrum; moisture and organic matter features are extracted through a deep learning multi-branch architecture, a moisture characterization index is constructed, cross-domain feature alignment is realized in combination with a domain adversarial network, and an accurate correction spectrum is obtained; all the modules are integrated to construct a soil moisture elimination reconstruction spectrum model, after layered verification and iterative optimization, a to-be-detected soil spectrum is input into the model, organic matter content near infrared spectrum inversion is completed, and a result is output. According to the method, moisture interference is removed through combination of physical radiation and deep learning, the inversion precision is improved, and the method is suitable for rapid detection of organic matters in various moisture-containing soil.

The invention relates to the technical field of mountain afforestation, provides an efficient nursery stock planting method suitable for mountain afforestation, and aims at solving the problems that in existing mountain afforestation, planting is not standard, the survival rate is low, the water and soil conservation capacity is weak, and the labor intensity is high. The forest space layout is optimized, and the water and soil conservation capability is enhanced; the mellow soil and immature soil layered stacking and backfilling technology is adopted, the natural structure of the soil is recovered, and the root zone microenvironment quality is improved; a fertilizer isolation layer is arranged and degradable container seedlings are implanted, so that the risk of root burning is avoided, the integrity of root systems is protected, and the survival rate of the seedlings is remarkably increased; by combining root fixing water slow irrigation, water retention covering and slope water collection and soil conservation structures, natural rainfall is effectively utilized, evaporation and runoff are reduced, and water saving and drought resisting are achieved; the whole process flow is standard, the replicability is high, and the dependence on artificial experience is reduced.

A leaching and desalinating system for sandy soil in estuarine land reclaimed by sand blowing before planting greenery is provided. The leaching and desalinating system comprises a water pump and pipe assembly, a freshwater storage tank and a main diverting and draining channel. The water pump and pipe assembly lifts freshwater from a river to the freshwater storage tank through a water delivery pipe, multiple infiltration parts in which greenery is planted are provided on the waterside slope, the infiltration parts are connected to each other via multiple drainage infiltration channels. The present disclosure can quickly desalinate the sandy soil in land reclaimed by sand blowing at a low cost, improve the physicochemical properties of the soil, and provide a basic guarantee for the subsequent greenery planting on the sandy soil in land reclaimed by sand blowing.

The invention discloses a grounding grid electric heating power multi-field coupling modeling method and system considering soil nonlinear breakdown, and belongs to the technical field of power system grounding grids. The method comprises the following steps: establishing a three-dimensional geometric model containing a soil domain and a grounding grid conductor; defining non-linear conductivity characteristics of the soil; setting multi-physical field parameters and corresponding boundary conditions of the three-dimensional geometric model; and establishing a multi-physical field coupling control equation set including an electric field equation, a heat conduction equation and a thermal stress equation, and solving by adopting a finite element method to obtain three-dimensional space distribution data of the grounding grid under lightning current impact. According to the invention, on the basis of fully considering the nonlinear breakdown characteristic of the soil, the accurate simulation of the electric heating power multi-physical field behavior of the grounding grid under the impact current effect is realized, and the accuracy of impact impedance, potential distribution and temperature rise prediction is obviously improved.

The invention provides a method suitable for water retention of soil with different textures. In order to better perform size matching between the biochar and soil particles, particle size grading is performed on the biochar according to the size of soil aggregates, and three kinds of biochar with the particle size larger than 2.0 mm, the particle size ranging from 0.25 mm to 2.0 mm and the particle size smaller than 0.25 mm are obtained. The three kinds of biochar with different particle sizes are used in different types of soil respectively, and 5% of biochar with the particle size of 0.25-2.0 mm is selectively applied according to the water retention requirement of the arid area loam farmland; according to the drainage requirements of loam waterlogging areas with more rainfall, 5% of biochar with the particle size larger than 2.0 mm is selectively applied; and 5% of biochar with the particle size smaller than 0.25 mm is selectively applied for water and soil conservation of sandy soil in the arid region. By scientifically regulating and controlling the particle size and the application amount of the biochar, the biochar is matched with the specific properties of the soil, so that the water retention capacity of the soil is improved, and the soil efficiency is improved.

An unmanned aerial vehicle (UAV), such as a multicopter, can be equipped with unique tools for use in agricultural operations. For example, the tools can be acquisition tools that can acquire a physical sample from a growing plant, such as a crop. The tools could also acquire physical specimens from areas around the plants. In addition, the UAV could be equipped with sensors, such as imagery acquiring devices (e.g., cameras, LIDAR, time of flight sensors, etc.) to acquire even additional information. The tools can be equipped via movable arms and / or end effectors to be able to directly contact the plants and / or soil. The longevity of the flight time of the UAV can be improved by tethering, improved batteries, or other add-ons to be able to acquire more information.

The invention discloses a dense-phase carbon dioxide pipeline leakage simulation system and method.The experimental device comprises a carbon dioxide injection device, a pressure-bearing container, a pressure-bearing pipeline, a temperature monitoring device and a temperature collecting device, and the carbon dioxide injection device is provided with a fluid outlet used for outputting dense-phase carbon dioxide; the pressure-bearing container is provided with a pressure-bearing cavity used for being filled with soil, the pressure-bearing pipeline is arranged in the pressure-bearing cavity, the pressure-bearing pipeline is connected with the fluid outlet, the pressure-bearing pipeline is provided with a leakage opening, the temperature monitoring device comprises a plurality of temperature sensors, the temperature sensors are arranged in the pressure-bearing cavity at intervals, and the temperature sensors are all electrically connected with the temperature collecting device. And the temperature acquisition device is used for receiving and processing the soil temperature monitored by the temperature sensor. The experimental device provided by the embodiment of the invention can simulate and verify the influence and diffusion rule of dense-phase carbon dioxide pipeline transportation leakage on soil temperature distribution, and provides a theoretical basis for dense-phase carbon dioxide leakage prevention and control and emergency disposal in practical application.

A method for simulating cross-seasonal heat storage of a buried pipe well group in a geothermal reservoir is characterized in that hot water and cold water are respectively injected in different seasons by arranging different injection ports in a countercurrent cross injection mode, so that a relatively balanced temperature distribution pattern of a'hot area 'and a'cold area' is formed in a stratum, and the volume structure of a buried pipe is simplified into a line unit model; discretizing the pipeline area by adopting a finite element method; on the basis, initial temperature field distribution of soil and initial parameters of fluid in a buried pipeline unit are set, a proper numerical solution method is selected to solve the pipeline unit model, and the stability of the calculation process and the accuracy of the result are ensured through real-time monitoring; in order to further analyze the influence of underground water seepage on the system performance, an underground water seepage module is introduced, and the difference between summer refrigeration and winter heat supply effects under the seepage condition or not is compared and researched; the invention further comprises a system, equipment and a storage medium for implementing the method.

The invention provides a soil health evaluation method. The method comprises the following steps: acquiring community characteristics of soil arthropods of to-be-evaluated soil; the soil arthropods are selected from at least one of diptera arthropods, arthropods of arachnids, coleoptera arthropods, hymenoptera arthropods and lepidoptera arthropods; the community characteristics comprise species composition and relative abundance of species; predicting soil indexes according to the community characteristics; the soil index is selected from at least one of a soil physicochemical index, a soil degradation index and a soil health index; the soil physical and chemical indexes are soil pH, soil total carbon, soil organic carbon and soil total nitrogen; the soil degradation indexes comprise a soil pH degradation index, a soil total carbon degradation index, a soil organic carbon degradation index and a soil total nitrogen degradation index; the soil health index is determined based on soil pH, soil microbial biomass nitrogen, soil respiration rate, soil total carbon, soil organic carbon, soil total nitrogen and soil bulk density; and performing soil health evaluation based on the soil indexes.

The invention provides a soil sampling device for soil analysis, and relates to the technical field of soil analysis. A depth sensing module, an intelligent sampling rod, an analysis and feedback module and a reinforcement learning module are integrated. The optimal sampling depth is predicted through the ultrasonic detection and near infrared scanning technology and the deep learning model. The intelligent sampling rod controls the sampling depth, the sampling amount, the vertical rotating force and the vertical rotating direction according to set parameters. The analysis and feedback module integrates various types of microsensors, monitors the pH value, conductivity and moisture of soil in real time, pretreats a sample, and obtains a soil component overview through spectral analysis. And the reinforcement learning module continuously updates and optimizes a sampling strategy through real-time data feedback and cloud computing. The display module visually displays real-time data, supports mode switching, planning and recording, and is simple and convenient to operate. According to the method, multiple methods such as deep learning and reinforcement learning are combined, the accuracy and efficiency of soil sampling are improved, and powerful technical support is provided for soil analysis.

The invention provides an undisturbed soil collecting device which comprises a drill rod capable of being driven to rotate, and a sampling barrel concentric with the drill rod is inserted into the bottom of the drill rod in a protruding mode. And a first ring cutting head synchronously rotating with the drill rod sleeves the outer side of the sampling barrel. The first girdling head can downwards and annularly cut soil, so that the soil positioned on the inner side of the first girdling head enters the sampling barrel to form an undisturbed soil sample. The soil discharging assembly can be driven by rotation of the drill rod to grind soil on the periphery after annular cutting and then convey the soil to the spiral blade, and the soil is directionally conveyed to the outside of the earth surface through the spiral blade. The drill rod adopts a downward annular soil cutting mode, the centripetal extrusion force on soil during soil sampling is reduced, compaction of an undisturbed soil sample is avoided, the undisturbed property of the undisturbed soil sample is kept, the redundant peripheral soil after annular cutting is rapidly ground and conveyed out of the earth surface in cooperation with the use of the soil discharging assembly and the spiral blades, and the soil sampling efficiency is improved. And the resistance of the drill rod during downward annular cutting and soil sampling is greatly reduced, so that the sampling barrel achieves the effect of sliding downwards into the soil during downward soil sampling.

A system is provided.SOLUTION: A system including means for acquiring image data of a plant or soil using a camera mounted on a smart device, means for communicating with a server including artificial intelligence for analyzing the acquired image data and receiving an analysis result, means for feeding back a growth state of the plant or presence or absence of a pest to a user based on the received analysis result, and software means for providing a growth prediction of the plant and an optimal coping method.SELECTED DRAWING: Figure 1

The invention relates to the technical field of soil treatment, in particular to an integrated saline grainfield soil improvement and remediation method. According to the method, precise irrigation, concealed pipe drainage, salt-tolerant crop planting and bioremediation technologies are comprehensively applied, and systematic treatment of the salinized soil is achieved. Precise irrigation dynamically regulates and controls the leaching depth and frequency on the basis of real-time soil salinity and moisture data, the underground water level is intelligently controlled in combination with an underground pipe drainage network, salt accumulation is effectively reduced, and water resource waste is avoided; according to the salt-tolerant crop and green manure rotation mode, salt damage is reduced through plant salt absorption and root system nitrogen fixation, soil organic matter accumulation and microbial community reconstruction are promoted through application of a microbial agent and biochar, and a sustainable soil improvement mechanism is formed. The intelligent monitoring system integrates multiple types of sensors, collects key indexes such as salinity, nutrients and pH values in real time, predicts the salinization trend and regulates and controls irrigation, fertilization and drainage equipment in a linkage mode, full-process automatic management is achieved, and the management precision and efficiency are remarkably improved.

The invention discloses preparation of a microbial compound element-based fertilizer and application of the microbial compound element-based fertilizer in saline-alkali soil treatment, and relates to the technical field of saline-alkali soil improvement. The preparation method comprises the following steps: inoculating lactic acid bacteria, rhodopseudomonas, phosphate-solubilizing bacillus, nitrogen-fixing bacillus, halophilic bacillus and halomonas into a composite culture medium in proportion, and carrying out stepped sequential fermentation culture under the conditions that the pH value is 7.5 and the temperature is 28 DEG C until the bacterial count is greater than or equal to 1010 CFU / mL. According to the preparation of the fertilizer based on the microbial compound elements and the application of saline-alkali soil treatment, a synergistic system of the compound functional flora, the chelated mineral substances and the intelligent organic carrier is constructed, so that multi-dimensional improvement of saline-alkali soil is realized, the limitation of a traditional single improvement mode is broken through, the salinity and pH value of the soil are effectively reduced, and the soil quality is improved. The soil fertility and biological activity are remarkably improved, the salt stress resistance of crops is enhanced, the effective period is prolonged, and the preparation cost is low.

The invention discloses a grounding resistance thermal-electric coupling prediction method and system suitable for various soil scenes. The method comprises the following steps: acquiring an electrode parameter, a soil parameter, a grounding fault parameter and initial temperatures of an electrode and soil; calculating an electrode current and a soil leakage current of the time step based on the electrode and soil resistivity of the time step; based on the electrode current and the soil leakage current of the time step, calculating the electrode temperature, the soil radial temperature distribution and the grounding potential rise of the time step by adopting a finite difference method; based on the electrode temperature and soil radial temperature distribution of the time step, updating the electrode resistivity and the soil resistivity of the time step + 1; if the end of the fault time is not reached, returning to continuously calculate the temperature of the electrode and the soil at the time step + 1; otherwise, outputting the electrode temperature and soil radial temperature distribution of each time step. According to the invention, thermal-electric dynamic coupling is considered, and accurate evaluation of the performance of the grounding system is realized.

The invention discloses a Mars soil simulant performance evaluation method based on spectrum-mechanics combined characterization, which comprises the following steps: acquiring surface soil chemical components and physical and mechanical reference data of a target Mars area, taking basalt, magnetite and hematite as raw materials, solving the optimal mass ratio by adopting an optimization algorithm, and preparing a sample. Then, systematic spectrum characterization is carried out on the sample, and components and spectrum characteristic data of the sample are obtained; and meanwhile, carrying out physical and mechanical property test on the sample to obtain mechanical property data. Further, spectrum and component data serve as independent variables, mechanical data serve as dependent variables, an associated data set is constructed, the influence weight is analyzed, and a component-structure-performance quantitative relation is established. And finally, based on all the data and the internal association thereof, calculating the comprehensive similarity between the simulant and the real Mars soil, and generating a comprehensive performance evaluation report. According to the method, multi-dimensional and standardized quantitative evaluation of chemical, mineral and mechanical properties of the Mars soil simulants is realized.

The invention discloses a multi-element conditioning fertilizer suitable for acid soil and a preparation method thereof, and the multi-element conditioning fertilizer suitable for acid soil comprises the following components by mass: 8-18 parts of diatomite; 20 to 30 parts of calcium humate; 25-35 parts of a silicon calcium magnesium phosphate fertilizer; 10 to 20 parts of chitosan modified humic acid; 5-10 parts of amino acid chelated medium trace elements; 15 to 25 parts of a biochar-based complex microbial inoculant; 3-8 parts of modified zeolite; 3-8 parts of polyglutamic acid; the multi-element conditioning fertilizer suitable for the acid soil contains various innovative components, chitosan modified humic acid improves the stability and adsorption performance of humic acid, amino acid chelated medium trace elements improves the absorption and utilization rate of the medium trace elements, polyglutamic acid enhances the water and fertilizer retention capacity of the fertilizer, and the water and fertilizer retention capacity of the fertilizer is improved. The diatomite and the modified zeolite significantly increase the porosity of the soil and improve the air permeability and drainage of the soil, and the components cooperate with each other, so that the physicochemical properties and biological activity of the acid soil can be comprehensively adjusted.

The present technology is directed to climate control systems suitable for studying plant growth in open-air fields and associated methods of operation. In one example, a method includes exposing a test specimen of a crop in an open-air field to substantially the same sunlight, precipitation, and / or pestilence conditions as a control specimen in the same open-air field for a test period. The test specimen is at least partially enclosed by a structure while the control specimen is outside of the structure. The structure has a first opening toward the soil of the open-air field and second opening exposed to ambient air. During the test period, a test temperature profile is maintained in the internal space of the structure while an air curtain is placed across the second opening of the structure to limit or prevent thermal interactions between the internal space of the structure and the ambient air.

The invention relates to the technical field of soil spectral analysis, in particular to a hyperspectral soil classification method, which comprises the following steps: acquiring hyperspectral images of various types of soil to be detected, and extracting a spectral feature group and a texture feature group from the hyperspectral images; obtaining topographic data, and extracting a topographic feature group from the topographic data; calculating separability indexes of the three feature groups among different soil classes; weighting the three feature groups based on a separability index to obtain an input feature vector; simplifying the input feature vector by adopting a recursive feature deletion method to obtain an optimal feature vector; and inputting the optimal feature vector into a middle layered random forest model for soil type detection to obtain a predicted soil type. According to the method, hyperspectral spectral features, spectral indexes, texture features and topographic features are integrated, a high-dimensional multi-source feature optimization mechanism based on factor weighting and recursive feature screening is introduced, and classification precision and model robustness are improved while feature dimensions are remarkably compressed.

The invention relates to the field of agricultural fertilizers and particularly provides a compound fertilizer for increasing the content of organic matters in soil and a preparation process thereof. The fertilizer comprises a humic acid activation carrier, a biochar-based material, a microbial agent, nitrogen-phosphorus-potassium inorganic nutrients and a coated controlled release agent. Through synergistic modification of humic acid and biochar, the stability of organic matters is enhanced, nutrient slow release is realized in combination with the decomposition effect of microbial flora on organic matters and a coating controlled release technology, and the accumulation efficiency of soil organic matters is remarkably improved. After being applied, the fertilizer can improve the granular structure of soil, improve microbial activity and reduce fertilizer loss, and is suitable for improving organic matter barren soil.

The invention relates to the technical field of digital soil mapping and soil information extraction, and discloses a soil type texture map deduction method, device and equipment of surface soil and a medium. The soil type texture map deduction method comprises the steps of obtaining mechanical composition of field sampling points, obtaining environment covariants of a target area, and obtaining the environment covariants of the target area; modeling the environment covariables of the target area into a plurality of spatial point elements, and modeling the soil type map into a plurality of spatial surface elements; establishing a machine learning model, and predicting the mechanical composition corresponding to the environment covariable array of all spatial point elements; assigning a corresponding soil texture to each space surface element based on a mechanical composition mean value of all space point elements in each space surface element surface; and drawing a continuously distributed soil type texture map according to the soil type textures corresponding to all the spatial surface elements. The soil type texture map inference method, device and equipment and the medium are used for assisting soil type naming in a soil classification system, the prediction precision is high, the prediction efficiency is high, and the cost is low.

The invention relates to a combined seed and fertilizer drill and an anti-blocking device and method suitable for wet and sticky soil, the combined seed and fertilizer drill comprises the anti-blocking device suitable for the wet and sticky soil, and the device comprises a vibration mechanism which is connected with a seed and fertilizer operation device and clamps a seed guide pipe and a fertilizer guide pipe at the same time; by applying high-frequency vibration, the cohesive soil attached inside and outside the seed guide pipe and / or the fertilizer guide pipe is loosened and falls off; the soil cleaning mechanism is mounted at the tail end of the seed and fertilizer operation device and forms a protective air curtain through high-speed airflow; the blockage monitors are respectively arranged in the seed guide pipe and the fertilizer guide pipe and are used for monitoring the material circulation state in real time; the controller is respectively connected with the vibration mechanism and the blockage monitor, receives the real-time monitoring signal and switches a conventional blockage prevention mode or a collaborative soil cleaning mode, and the conventional prevention mode is that the soil cleaning mechanism continuously blows air to prevent blockage during normal operation; the cooperative soil cleaning mode is that when blockage occurs, the vibration mechanism and the soil cleaning mechanism vibrate at the same time and conduct air-blowing cooperative soil cleaning. The invention further provides an anti-blocking method for the device.

The invention discloses a method for enhancing the biological nitrogen fixation capacity of soil based on micro-plastics, which comprises the following steps: adding poly (adipic acid-butylene terephthalate) micro-plastics into target soil, and the addition amount is 0.2-2% of the mass of the soil. The activity of dehydrogenase and urease of rhizosphere microorganisms is activated through the degradation process of the poly (butylene adipate-co-terephthalate) micro-plastic in soil, and microorganism groups with a nitrogen fixation function are specifically enriched, so that the expression of nitrogen fixation genes is up-regulated, the biological nitrogen fixation capacity of the soil is enhanced, and the nitrogen condition of the soil is improved.

The invention relates to the technical field of biology, and particularly discloses bacillus megaterium LLH-B2 and application thereof. The invention relates to bacillus megaterium LLH-B2, which is preserved in China Center for Type Culture Collection in Wuhan University, Wuhan, China on November 14, 2022, and is named as bacillus megaterium LLH-B2, and the preservation number is CCTCC NO: M 20221787. The bacillus megaterium LLH-B2 is named as bacillus megaterium LLH-B2. The bacillus megaterium LLH-B2 can stably survive for a long time in a sandy soil drought environment, heavy metal treatment of sandy soil is efficiently treated, meanwhile, the soil fertility is improved, and plant growth is promoted.

The invention relates to the technical field of improvement of coastal saline-alkali land, in particular to a soil conditioner for salt-control fertile soil of coastal fishery reclamation saline-alkali land and a preparation method of the soil conditioner. The invention relates to a soil conditioner for salt-control fertile soil of coastal fishery receding reclamation saline-alkali land. The soil conditioner comprises the following raw material components in parts by mass: 40-60 parts of urea, 25-45 parts of calcium superphosphate, 30-45 parts of potassium sulfate, 20-25 parts of modified oyster shell powder, 10-15 parts of humic acid, 3-5 parts of a compound microbial agent, 10-20 parts of desulfurized gypsum and 25-35 parts of a biochar composite material, the biochar composite material is prepared from the following raw material components in parts by mass: 1 to 2 parts of sodium alginate, 1 to 2 parts of chitosan, 3 to 8 parts of biochar, 1 to 5 parts of calcium chloride, 10 to 20 parts of tuff stone powder, 0.25 to 2 parts of acidified attapulgite, 0.01 to 0.08 part of graphene oxide, 1 to 5 parts of ferric nitrate, 0.6 to 3 parts of copper nitrate and 0.1 to 0.5 part of silane coupling agent. By adopting the soil conditioner prepared by the invention, the pH value of soil, the volume weight of the soil and the total amount of water-soluble salts can be remarkably reduced, meanwhile, the organic matters of the soil are increased, and the porosity of the soil is increased.

The invention relates to the technical field of soil remediation, and discloses a soil remediation material for targeted adsorption of perfluoroalkyl acid organic pollutants and a preparation method of the soil remediation material. The soil remediation material is prepared from the following raw materials: microorganisms, a porous carrier, cationic gel, anionic gel and ferrite, wherein the microorganisms have the capability of driving a nitric acid reduction-ferrous oxidation process. According to the soil remediation material provided by the invention, the microorganisms with the capability of driving the nitric acid reduction-ferrous oxidation process, the porous carrier, the cationic gel, the anionic gel and the ferrite are used as raw materials, and the mechanical strength change of the material in different application stages is dynamically regulated and controlled through the valence change of iron ions and the mineralization process of the microorganisms; according to the soil remediation material disclosed by the invention, the miscibility of the soil remediation material and soil and the specific adsorption of the medium-short-chain perfluoroalkyl acid are enhanced, and meanwhile, the conversion of pollutants from an extractable state to a non-extractable state can be promoted, so that the deep fixation of the pollutants is realized, and the secondary release risk after fixation is reduced.

The invention provides a mining ground fracture erosion prediction method, device and equipment under a freeze-thaw condition, and belongs to the field of geological research, and the method comprises the steps: obtaining the related data of a target mining ground fracture; calculating a frost heaving stress field and a mining-induced tensile stress field based on the related data, and performing superposition to obtain a total tensile stress field; when the total tensile stress field is greater than the tensile strength of the soil, calculating the coupling damage degree; based on the coupling damage degree, the effective cohesion and the effective internal friction angle of the soil are determined, and then the critical starting shear stress of the crack and the average flow velocity of the scouring critical state are determined; based on the critical starting shear stress and the average flow velocity, total energy consumed for erosion and collapse of the soil body in unit area is determined, and actual water flow power is calculated; and calculating the ratio of the total energy to the actual water flow power to obtain a physical index of the anti-erosion comprehensive capability of the soil so as to judge the erosion risk state of the soil crack. Therefore, space-time prediction and accurate early warning of the erosion risk can be realized.

The invention relates to the field of soil improvement, in particular to a method for improving saline-alkali soil through an alkali-reducing fertility-improving stress-resistant saline-alkali soil improver and application. According to the method, a three-factor four-level orthogonal soil improvement experiment is designed through desulfurization gypsum, wormcast and straw compost, the soil improvement effect is further verified in a crop cultivation mode, the optimal improvement proportion of the composition is calculated and determined through an entropy weight-topsis model, and through the mode of combined application of three substances, the soil improvement effect is improved by improving the most basic soil environment. Therefore, the stress damage of the saline-alkali soil to the plants is effectively reduced, and the purpose of improving the saline-alkali soil is achieved.