232 results about "Soil column" patented technology

Disclosed in the present invention is a foundation deformation calculation method based on numerical model stress extraction. First, a numerical model is established to calculate the vertical additional stress distribution and horizontal additional stress distribution of foundation soil, wherein the elastic modulus of the foundation soil is selected within a range of two to five times the compression modulus on the basis of engineering experience; a layer-wise summation method is used, in which layered settlement is directly calculated for a natural foundation, settlement in a reinforced zone and settlement in an underlying layer are both calculated for a composite foundation, and layered settlement amounts are superimposed and multiplied by a settlement empirical correction coefficient to obtain a final settlement amount; the projection of a horizontal displacement calculation point on the ground and a vertical soil column below the horizontal displacement calculation point are taken as a vertically placed finite elastic long beam, the cross section of the soil column is square, the side length of the soil column is preferably 0.1 m or below, the modulus of the beam is the same as that of the soil, one end is located in a ground surface plane, and the other end is located in a plane where a calculation depth is located; and a distributed load is dispersed into several concentrated loads, a foundation bed coefficient is determined on the basis of a specification, and the horizontal displacement of the calculation point is obtained by means of a beam-on-elastic-foundation method.

The invention belongs to the technical field of data processing, and particularly relates to a rice field soil emission reduction potential estimation method and system based on carbon-nitrogen coupling and a medium, and the method comprises the steps: collecting rice field nitrogen application information in a target area through literature statistics, dividing rice fields with similar nitrogen application into the same type, and selecting a plurality of typical areas from each type; carrying out soil sampling at fixed intervals in the typical rice field area, analyzing the nitrogen concentration level of the soil, and obtaining representative samples; performing soil column experimental simulation by using the representative sample, and estimating the average emission of specific gas; and determining significant influence factors, setting different carbon-nitrogen coupling situations to carry out an orthogonal simulation experiment, quantifying factor importance, carrying out weighted accumulation to obtain a comprehensive emission estimation value, and evaluating the carbon-nitrogen coupling-based biochar rice field emission reduction capability. The method can effectively estimate the rice field soil emission reduction potential.

The invention discloses a rapid reconstruction method, device and equipment for a soil mass freeze-thaw hydrothermal field and a storage medium, and the method comprises the steps: building a one-dimensional soil column frost heaving-thaw collapse calculation model through finite element software, carrying out the simulation calculation to obtain a soil mass one-dimensional freeze-thaw transient temperature field and a moisture field, and obtaining a source domain data set containing the position, time, temperature and saturation; the position and time in the source domain data set serve as input, temperature and saturation serve as output, a deep neural network is established, and a loss function comprises data loss and physical loss and also relates to a temperature field and a moisture field; training the source task model to obtain neural network parameters; and training the target task model. On the basis of numerical simulation and deep transfer learning, the problem of multi-field coupling under the background of machine learning is solved, and meanwhile, the generalization performance of the model is improved, so that rapid reconstruction of the transient temperature field and the moisture field of the one-dimensional frost heaving-thaw collapse test of the soil body under the condition of sparse measuring points is realized.

The invention discloses a testing device and a testing method for a permeability coefficient characteristic curve of wicking geotextile, and belongs to the technical field of permeability coefficient testing. A to-be-tested wicking geotextile and a soil layer are laid between an upper plate body and a lower plate body of a test unit of the test device; the two sealing covers are located at the two ends of the upper plate body and the two ends of the lower plate body respectively. Each of the first hollow column and the second hollow column comprises a hollow column section positioned above the upper plate body and below the lower plate body, the hollow column sections distributed up and down are communicated with a gap between the upper plate body and the lower plate body, and each hollow column section is filled with a soil body and forms a test soil column; the load output end of the load applying unit is used for applying a vertical load to the top of the test soil column and the upper plate body. The test device disclosed by the invention can really simulate the occurrence condition of the wicking geotechnical cloth in the roadbed engineering; the testing method based on the testing device can rapidly test the permeability coefficient of the wicking geotextile, and a characteristic curve of the permeability coefficient of the wicking geotextile is obtained.

The invention discloses a hydrothermal salt migration determination test device and method for simulating an external environment, and the device comprises a constant temperature box which is used for providing a constant temperature test environment; the rainfall simulation device is arranged at the top of the constant-temperature box and used for simulating an external rainfall environment, and the rainfall simulation device controls the rainfall capacity, the rainfall speed and the rainfall duration through an external controller; the soil column model device is arranged on the inner side of the constant-temperature box and used for containing a test soil sample, a soil column model is arranged in the soil column model device and serves as the test soil sample, a heat preservation layer is arranged on the outer surface of the soil column model, and a glass cover covers the outer side of the soil column model in an attached mode. By integrating the rainfall simulation device, the solar radiation simulation device and the water level simulation device, comprehensive simulation of various external environment factors is realized, the limitation that only a single environment factor can be simulated in the prior art is overcome, the test condition is closer to the actual engineering environment, and the test efficiency is improved. And the reliability and the practical value of a test result are improved.

The invention discloses a method for safely irrigating saline water with different mineralization degrees and reducing salt in a plough layer, and relates to the technical field of agricultural irrigation, and the method is characterized by comprising the following steps: monitoring the mineralization degree of irrigation water and soil moisture and salt dynamic states under various irrigation mode conditions; through a soil column simulation test, a saline water mineralization degree threshold value suitable for irrigation of saline-alkali cultivated lands with different soil properties and salt contents is found; performing a plot test in the field, and establishing an irrigation water-soil water-underground water salt migration model under various irrigation modes; hYDRUS-1D software is adopted for dynamic simulation and prediction of soil hydrothermal salt coupling migration under different saline water irrigation conditions. The method can be suitable for different soil texture types, crop types and underground water conditions, the salt content of the saline-alkali cultivated land can be effectively reduced, on the premise that crop growth is guaranteed, salt water resources are utilized to the maximum extent, irrigation cost is reduced, sustainable utilization of the saline-alkali cultivated land is achieved, and the method has important practical application value.

The invention discloses a soil column porosity dynamic inversion system and method and a sensor array structure, and belongs to the technical field of environmental soil tests. The system comprises a test soil column system; the acoustic monitoring module is used for acquiring ultrasonic travel time and amplitude information in the soil column; the resistivity monitoring module is used for acquiring resistivity information in the soil column; and the data processing host receives data of the acoustic monitoring module and the resistivity monitoring module, executes a joint inversion algorithm based on a rock physical coupling model, and dynamically inverts spatial distribution and time evolution of the three-dimensional porosity in the soil column by constructing a target function containing ultrasonic travel time / amplitude data and resistivity data at the same time. According to the invention, real-time, three-dimensional, high-resolution and high-adaptability soil column internal structure monitoring can be realized, and solid data support is provided for environmental rock and soil pollution migration mechanism research and restoration effect evaluation.

The invention discloses a frozen soil column test device and method based on thermoelectric refrigeration and DIC monitoring, the device comprises a transparent soil column container, a temperature control system and a digital image acquisition system, the transparent soil column container is used for containing a soil column sample, and the transparent soil column container is formed by combining two double-layer cylinder wall acrylic semicircular cylinders; the frozen soil freezing process and the frost heaving behavior are visualized, and real-time monitoring and analysis are facilitated. During an experiment, internal and external temperatures are accurately adjusted through a temperature control system to simulate a frozen soil freezing process; the digital image acquisition system shoots a soil column surface image in real time through a high-resolution camera, digital speckles are combined, real-time monitoring and analysis of the soil body frost heaving amount and the freezing frontal surface position are carried out through a digital image related technology, and the soil body frost heaving characteristic and the freezing frontal surface dynamic change can be measured with high precision.

The utility model relates to a test device convenient for observing the soil loosening effect of a fertilizer. Comprising at least one cylinder used for containing fertilizer and soil and a detachable funnel screen piece matched with an opening in the top of the cylinder. The detachable upper barrel cover is matched with the opening in the top of the barrel body; the cylinder body is made of a transparent material, and scales convenient for observation are arranged on the outer surface of the transparent cylinder body; the device has the advantages that the change of a flocculation aggregate structure in the soil falling process can be directly observed, meanwhile, the soil porosity can be analyzed by observing the height of a soil column, and the device is reasonable in design, easy to clean and convenient to carry.

The invention relates to the technical field of soil pollution treatment, and discloses a phosphate passivation condition-based soil cadmium vertical migration law analysis method, which comprises the following steps: selecting a cadmium-polluted soil column, applying a calcium magnesium phosphate fertilizer as a passivator to the soil column part, carrying out a soil column solute penetration experiment, collecting pore water at different depths through side sampling holes, and determining the vertical migration law of cadmium in the soil column; measuring a measured value; the method comprises the following steps: establishing a one-dimensional migration-reaction model based on a Hydrus-Phreeqc coupling module, simulating migration and transformation of cadmium in soil and chemical reaction with phosphate, and obtaining a simulation value; according to the actual measurement value and the simulation value, the Hybrid-Phreeqc coupling module is corrected, and the vertical migration characteristics of cadmium are analyzed; after the soil column experiment is finished, soil samples are collected from top to bottom, and the distribution of cadmium in the soil is detected and analyzed. According to the method, the soil column experiment is combined with the Hydrus-Phreeqc coupling model, so that the influence of applying the calcium magnesium phosphate fertilizer on the vertical migration of the soil cadmium can be more systematically analyzed; the method is easy to operate, high in practicability and capable of being applied to remediation research of different heavy metals.

The present invention relates to the technical field of soil column water seepage models. Disclosed are a multifunctional soil column model device and a using method. According to the multifunctional soil column model device and the using method, by extending an electric push rod, a pressing plate moves downward to approach the soil; as one end of each rope is connected to a fixing plate, rope reels are enabled to release the corresponding ropes and rotate, a rotating shaft drives cams to rotate, and the cams and pulleys compress each other to move and drive, in cooperation with first springs, a fixing sheet to shake in a reciprocating mode, so that the fixing sheet drives, by means of a second spring, a threaded disc and the pressing plate to vibrate in a reciprocating mode, the pressing plate advances downward in a vibrating mode, and the pressing plate makes contact with the soil and maintains vibration to perform compaction operation, thereby improving the soil compaction quality, better simulating subgrade soil, and enhancing experimental accuracy; moreover, by assembling multiple model barrels for use, experimental data at different heights can be simulated, and by means of assembly, the space occupied by model barrels can be reduced, thereby facilitating transportation.

The invention provides a method for improving the removal rate of heavy metals in cohesive soil based on a freeze-thaw method. The method comprises the steps of pretreatment, water replenishing saturation, freezing and freezing, heating thaw settlement, leachate collection, repeated leaching and the like. Wherein the pretreatment step comprises the steps of filling a compacted cohesive soil column with akadama soil and compacting the akadama soil in a layered manner to prepare a mixed soil column, that is, the akadama soil and the cohesive soil are filled in a layered manner, the akadama soil with strong frost heaving property is used as admixture soil, the akadama soil structure is seriously broken after freezing and thawing circulation, the number of pores is increased, and migration and storage of water are facilitated; meanwhile, the adsorption capacity of the akadama soil to lead, cadmium and other heavy metal elements is weak, and the akadama soil can be repeatedly used for repairing the heavy metal polluted cohesive soil, so that the method provided by the invention can effectively improve the intake of the eluting agent, improve the removal rate of the heavy metal elements and shorten the soil repairing period, and is beneficial to outdoor large-scale popularization and application.

The utility model relates to the technical field of rare earth resource exploration, in particular to a comprehensive measuring device for hydraulic parameters and various electric responses, which comprises a constant-pressure water supply component, an adjusting valve, a measuring soil column container, a collecting and measuring component, a pressure sensor, a recorder and an electric response measuring instrument. The soil column measuring container comprises a container main body, a microporous baffle plate, two current electrodes and two measuring electrodes, the water inlet end and the water outlet end of the constant-pressure water supply assembly are respectively communicated with the container main body through pipelines, and the storage and collection assembly is arranged on the pipeline between the water outlet and the constant-pressure water supply assembly; a sample cavity between the two microporous baffles in the container main body is used for filling a sample; the adjusting valve is used for adjusting the flow; the pressure sensor, the collecting and measuring assembly, the measuring electrode and the current electrode are used for measuring hydraulic parameters and flowing electric response. According to the utility model, the hydraulic parameters and various electric responses of the sample can be accurately measured, and the electric responses under different hydraulic conditions can be measured.

The invention provides a test device for simulating a pollutant migration process under a temperature-moisture coupling effect, and belongs to the field of soil environment scientific research. The test device comprises variable-pressure gas supply equipment, a soil column pipe, exhaust equipment, a rainfall simulation system, evaporation and illumination simulation equipment and a data acquisition and analysis system. The variable-pressure gas supply equipment comprises a pollution gas storage tank and a pressure controller; the soil column pipe comprises an air inlet cavity, a simulated soil column cavity and an exhaust cavity, and a sampling hole is reserved in the simulated soil column cavity; the data acquisition and analysis equipment comprises a distributed optical fiber, a data acquisition instrument, a computer and a gas chromatograph. The test device and the test method provided by the invention can accurately control temperature and humidity, simulate rainfall, evaporation and illumination, are suitable for various soil types, record data in real time through a high-precision monitoring system, and reveal diffusion, convection and adsorption rules of gas in the soil.

The invention relates to the technical field of soil body tests, in particular to a sectional type full-automatic soil column temperature control system and method based on soil body temperature control. The system comprises a temperature control module, a model cavity, a rainfall simulation module and a measurement module, the model cavity comprises a container, a blocking net and a soil column, drainage holes are formed in the bottom of the container, the blocking net is laid on the inner side of the bottom of the container, the container is filled with soil, the soil column is evenly divided into multiple layers of soil layer structures with the same thickness, and the contact faces between soil layers are stricken off. The container is provided with an overflow port at a position higher than a specified height of the surface of the soil column, the rainfall simulation module provides rainfall to the surface of the soil column, the measurement module is butted with the soil column and the overflow port to collect soil column data, and the temperature control module controls the temperature of the soil column. According to the device and the method, the aim of accurately controlling the temperature at different depths of the soil column is fulfilled, so that the requirement of researching the seepage characteristics of the plant-green soil covering layer under different temperature conditions is met.

The invention belongs to the field of soil environment pollution simulation and prediction, and provides a prediction method based on a two-point chemical unbalanced model, which is used for quantitatively evaluating the effect of regulating and controlling the migration behavior of p-nitrophenol in acid red soil by straw stalk biochar. According to the method, a biochar-red soil composite medium system is constructed, a soil column leaching experiment is carried out to obtain penetration curve data, a two-point chemical unbalance model in CXTFIT software is utilized to carry out parameter inversion, and key parameters such as a retardation factor, a two-region distribution coefficient, a mass transfer coefficient and a liquid phase degradation coefficient are accurately identified. Model verification shows that the goodness of fit is high, and a parameter change rule reveals the inherent mechanism of enhancing the pollutant retention capacity, changing the proportion of fast and slow adsorption sites and influencing mass transfer kinetics by the biochar. Based on the verified model, the long-term migration behavior and pollution risk of p-nitrophenol under different environmental conditions can be simulated, and a scientific basis is provided for groundwater pollution control and remediation strategy optimization.

The invention discloses a shield tunnel stratum type identification method and device and a program product, and belongs to the technical field of shield tunnels, the method comprises the steps that exploration parameters and shield parameters of a target stratum slice are acquired, and the target stratum slice is obtained by slicing a target soil column located in a shield tunnel area; feature extraction is carried out on the shield parameters to obtain shield parameter features of the target stratum slice, and the shield parameter features indicate the stratum strength of the target stratum slice; type feature extraction is carried out according to the exploration parameters of the exploration hole soil column adjacent to the target stratum slice, the stratum type feature of the target stratum slice is obtained, the stratum type feature indicates the distribution condition of the stratum type of the exploration hole soil column adjacent to the target stratum slice, and the exploration hole soil column is located in the shield tunnel area; and inputting the shield parameter characteristics, the stratum type characteristics, the exploration parameters and the shield parameters into a stratum type identification model to obtain the stratum type of the target stratum slice. According to the invention, the stratum type identification precision is improved.

The invention discloses a mountainous area surface matrix physical property prediction method, and relates to the technical field of geological exploration, and the method comprises the steps: obtaining mountainous area surface point cloud data, separating vegetation from ground points through a point cloud classification algorithm, and generating a digital elevation model and a digital surface model; based on the digital elevation model and the digital surface model, a quantum gravity gradiometer is adopted to move along a contour line for measurement, a gravity gradient tensor is obtained, terrain interference signals are eliminated, and a vertical density profile is obtained through inversion; identifying a density abnormal region according to the vertical density profile, acquiring an undisturbed soil column sample by adopting a drilling unit, determining a grain composition and moisture characteristic curve, performing DNA extraction and microorganism sequencing on the undisturbed soil column sample, and calculating the relative abundance of the nitro spirillum phylum. According to the method, the dynamic coupling model is constructed through fusion of quantum gravity gradient measurement and microbiological omics data, and the problem of insufficient vertical density-permeability coefficient coupling modeling precision of a traditional method is solved.

The invention provides an experimental device for simulating migration of micro-plastic in an undisturbed soil column under a rainfall condition and application, and belongs to the technical field of soil micro-plastic migration. Comprising a Markov bottle and a simulated soil column, the right side of the upper end of the Markov bottle is provided with a water inlet with a stainless steel cover, and the left side of the upper end of the Markov bottle is provided with an exhaust pipe with scale marks on the surface; the bottom of the Markov bottle is higher than the top of the simulated soil column rainfall tray; the simulated soil column comprises a rainfall disc and a column body arranged below the rainfall disc, the rainfall disc is of a dial type, exhaust holes are formed in the surface of the rainfall disc, a needle head is arranged in the rainfall disc, and the rainfall disc is connected with the upper end of the column body through a flange plate; the column body is divided into an air layer, an undisturbed soil column filling layer and a quartz sand layer which are sequentially connected through flange plates, a water outlet is formed in the bottom of the flange plate at the lower end, and the column body is a hollow cylinder with an upper opening and a lower opening.

The invention belongs to the field of soil dissolved organic matter analysis, and provides a multispectral-based DOM detection and reclamation influence evaluation method, which comprises the following steps: step 1, collecting dry farmland soil samples of different reclamation years, and obtaining soil column samples of a plough layer, a plow pan and subsoil; 2, extracting, centrifuging and filtering the soil sample to obtain a DOM solution; 3, detecting the DOM solution by adopting an ultraviolet-visible absorption spectrum; step 4, adopting a three-dimensional fluorescence spectrum and combining parallel factor analysis to obtain fluorescence components and source characteristics of the DOM solution; step 5, analyzing molecular composition and characteristic parameters of the DOM solution by adopting solid-phase extraction in combination with Fourier transform ion cyclotron resonance mass spectrometry; and step 6, based on the detection data in the steps 3-5, evaluating the influence of reclamation years on the composition, structure and degradation characteristics of the DOM. According to the method, multi-dimensional detection of soil DOM is realized through a multi-spectrum and mass spectrum combined technology, and DOM is comprehensively analyzed from a macrostructure to molecular composition.

The invention discloses a method, system, equipment and medium for predicting regional soil moisture, and relates to the technical field of soil moisture diagnosis and prediction.The method comprises the steps that a regional surface soil moisture model driven by unmanned aerial vehicle data is established through a random forest algorithm on the basis of unmanned aerial vehicle multispectral data and in-situ data synchronously collected on the ground; dividing a research area plane into a plurality of grids, regarding each grid as a one-dimensional vertical soil column, and predicting the surface soil moisture content of each grid by using the trained area surface soil moisture model; and for one-dimensional soil columns of all grids, by utilizing an ensemble Kalman filtering method, the predicted surface soil moisture of the grids is regarded as observation and independently and synchronously assimilated into a one-dimensional vertical soil moisture physical model of the grids, so that a regional quasi-three-dimensional soil moisture prediction model jointly driven by the multi-spectral data of the unmanned aerial vehicle and the physical model is formed. Therefore, accurate prediction of soil moisture at any space-time node in the research area is realized.

The invention discloses a detection system and method of a sand lysimeter, and belongs to the technical field of sand lysimeters, the detection system comprises an acquisition module, an analysis module, a calculation module and an output module; the acquisition module is used for acquiring the mass of the inner barrel and the soil column in the barrel through a sensor on the outer barrel; the mass of water in the water receiving basin is obtained through a sensor of the water receiving basin; the analysis module is used for carrying out anomaly analysis on the quality data of the sensor and marking the abnormal quality data; the calculation module is used for calculating evaporation capacity according to metering interval selection of man-machine interaction; and the output module outputs the evaporation capacity as a detection result of the sand lysimeter. Abnormal data caused by wind and sand interference can be effectively judged and marked and adjusted, and deviation of evaporation capacity calculation caused by abnormal values is avoided.

The invention provides a device for simulating the vertical migration rule of oil and gas field ground pollutants and a simulation method, and relates to the technical field, the device comprises a soil column leaching module, a spraying module and an underground water control module, the soil column leaching module and the underground water control module are both arranged in an underground foundation pit, and the soil column leaching module comprises a soil column experiment device; a sensor device is inserted into the soil column experimental device, the sensor device is electrically connected with the data acquisition device, the soil column experimental device is provided with a soil sampling window, the spraying module comprises a spraying pipe, one end of the spraying pipe is communicated with the reservoir, and the other end of the spraying pipe extends above the soil column experimental device. On the basis that only surface water is concerned to drive pollutant migration originally, the underground water control module and the water supply Markov bottle are additionally arranged, and fluctuation of the underground water level can be achieved; long-term and continuous in-situ monitoring of soil moisture in-situ data can be achieved in real time, non-destructive collection of samples can be achieved, and the research quality of the vertical migration rule of oil and gas field ground pollutants is improved.

The utility model relates to a sampling device for paddy field deep soil in an irrigation period, and relates to the technical field of soil sampling devices. The sampling device for the deep soil of the paddy field in the irrigation period comprises a cylinder body, a soil column cutting part and a bulldozing device, wherein a sampling hole penetrating through the two ends in the axial direction of the cylinder body is formed in the cylinder body; an overflow port communicated with the sampling hole is formed in the upper end of the cylinder body or the side wall close to the upper end; an inserting channel is formed in one side of the cylinder body, and the soil column cutting-off piece comprises a connecting part and a cutting-off shovel fixedly connected to the end of the connecting part; the cutting shovel can penetrate through the insertion channel to be inserted into the sampling hole and is used for cutting the soil column in the sampling hole; the bulldozer comprises a push rod and a piston push block fixedly connected to the end of the push rod, and the piston push block can stretch into the sampling hole to be used for pushing out the soil column in the sampling hole. The whole sampling device is simple in structure, low in manufacturing and using cost and convenient and reliable to use.

The utility model provides a soil acidification control experiment soil column, and relates to the technical field of soil acidification detection sampling. The soil acidification control experiment soil column comprises an experiment soil column body, a sampling pipeline is fixedly connected to the interior of the experiment soil column body, the two ends of the sampling pipeline are open, and a movable baffle is hinged to the interior of the sampling pipeline through a pin shaft. According to the device, an experimental soil column is inserted into a potted plant, one end of a sampling pipeline is shielded through a movable baffle and a fixed barrier strip, external soil is prevented from entering the sampling pipeline, and when the potted plant needs to be subjected to acidification detection, a connecting sliding block is driven to slide away from a connecting pull rod; under the connecting action of the connecting pull rod, the movable baffle is pulled to turn over to open one end of the sampling pipeline, so that soil in a potted plant is conveniently sampled through the sampling pipeline, the pH condition of the soil is measured, the vertical change trend of acidification is known, and the soil structure and potted crops are not damaged.

The invention relates to the technical field of underground water simulation, and provides a shallow underground water quality change simulation device in a multi-supply mode, comprising a soil column for storing soil; the high-pressure oxygen-free bottle is used for conveying water to the soil column; one end of the first matrix pipe is communicated with the high-pressure oxygen-free bottle; the soil column is used for conveying water to the low-pressure oxygen-free bottle; and the other end of the second matrix pipe is communicated with the low-pressure oxygen-free bottle. The simulation device can comprehensively simulate lateral replenishment and more truly restore the groundwater replenishment process in the natural environment, through cooperation of the soil columns and the matrix pipes, the water replenishment path and flow can be controlled, observation by researchers is facilitated, and deep understanding of the dynamic change rule of groundwater is facilitated. Wherein the high-pressure oxygen-free bottle and the low-pressure oxygen-free bottle can completely simulate an oxygen-free environment in a real environment. By means of the technical scheme, the problem that in the prior art, the reconstruction precision of the underground reducing environment of an underground water simulation device is insufficient is solved.

The utility model discloses a kind of for simulating root litter in situ sustained input device and its application, through the design of the soil column with stainless steel handle, 1 μm aperture nylon net, the PVC pipe with hole in bottom and multi-generation root litter in situ sustained input simulation system, the dynamic simulation of root litter sustained input process under soil profile scale is realized.The device solves the limitation of traditional decomposition experiment, can dynamically add root litter without destroying soil structure, while effectively blocking exogenous interference, ensuring the accuracy and consistency of experiment.The utility model provides key technical platform for studying the influence of root litter in situ sustained input on soil carbon stability, and is suitable for ecology, carbon cycle research and ecological system management and other fields.

The invention discloses a soil column test device and method for plant root zone micro-ecology simulation research. The soil column test device comprises a soil column test model module and a solution collection module. The soil column experimental model module comprises a soil filling container with an upper cover and a lower cover, a plant root simulation device, a simulated root exudate sampling device, a soil oxidation-reduction potential monitoring device and a gas collection device, and the solution collection module is used for collecting liquid in the simulation process. According to the device, the plant root simulating device, the root exudate simulating and sampling device, the soil oxidation-reduction state monitoring device and the gas and soil solution collecting device are integrated, so that comprehensive simulation and monitoring of multiple factors of a plant root zone are realized. The device is low in processing cost, convenient to use and easy to operate, all parts are detachable and reusable, multiple pieces of environmental parameter information can be obtained, and the device has important significance on plant root zone micro-ecology research.

The invention discloses a soil organic carbon mineralization rate determination method, and relates to the technical field of soil carbon circulation and greenhouse gas monitoring. The method comprises the following steps: carrying out hydrochloric acid back titration on an absorption liquid by adopting an automatic potentiometric titration method, converting to obtain the mass of a carbon element contained in carbon dioxide, calculating the mineralization rate by combining the dry soil weight and the culture interval, and finally subtracting an inactivation control value to obtain the organic carbon mineralization rate driven by pure microorganisms. A thin-wall stainless steel undisturbed soil drill matched with the inner diameter of a culture bottle is used for collecting soil columns in a layered manner, PVC liner tube sealing and constant-temperature transportation are matched, and a cold chamber for simulating the in-situ temperature is combined, so that the in-situ structure and the microbial habitat of the loose high-water-content peat soil are reserved to the maximum extent, and damage of traditional pretreatment to soil pores and microbial communities is avoided.

The utility model discloses a soil sampling device that is convenient for sample extraction, and specifically relates to the field of soil sampling technology, including: a limit plate, a pedal is provided on one side of the limit plate, a retaining cone is provided at the bottom of the pedal, a first motor is provided on the top of the limit plate, a first threaded rod is provided at one end of the first motor, a retaining plate is sleeved on the surface of the first threaded rod, a second motor is provided at the bottom of one end of the retaining plate, a connecting frame is provided at one end of the second motor, and a sampling assembly is provided at the bottom of the connecting frame. The soil sampling device that is convenient for sample extraction is provided with a sampling assembly, and after the sampling tube is embedded in the soil column, the second hand wheel can be turned to further rotate the cutting plate toward the axis of the sampling tube, so as to cut the soil column inside the sampling tube to avoid the original soil from being connected, and at the same time, the soil column is supported.