317 results about "Cadmium pollution" patented technology

The invention discloses a soil cadmium pollution risk identification method based on a spatial information enhancement algorithm, and relates to the field of soil cadmium pollution risk prediction and risk identification, and the method comprises the steps: predicting a constructed soil cadmium pollution data set through employing a machine learning algorithm, and comparing the prediction precision of the machine learning algorithm, selecting an optimal model as a soil cadmium concentration prediction model; dividing a target area into grid units, utilizing a soil cadmium concentration prediction model to perform prediction, outputting soil cadmium concentration spatial distribution data, utilizing a Bayesian information criterion BIC to determine the optimal clustering number of soil cadmium pollution, adopting a Gaussian mixture model to perform clustering on the soil cadmium concentration, obtaining soil cadmium clustering features, and determining the soil cadmium pollution. Identifying and evaluating a soil cadmium pollution risk area; and carrying out overlay analysis on the risk receptor and the soil cadmium pollution risk area, and verifying the accuracy of identifying the risk area by the soil cadmium concentration prediction model. According to the method, accurate identification and reliable evaluation of the soil cadmium pollution risk are realized.

The invention relates to the technical field of soil remediation, and discloses a remediation treatment method and system for simulating cadmium-contaminated soil and a storage medium. The method comprises the following steps: detecting and analyzing the adsorption performance of the remediation material according to soil cadmium content data to obtain remediation material performance data; based on the soil cadmium content data and the remediation material performance data, carrying out data processing on a pollutant migration rule to obtain pollutant migration characteristic data; carrying out data analysis on the repair material combination by utilizing the pollutant migration characteristic data to obtain material combination effect data; according to the material combination effect data, the repair process is dynamically detected, and repair effect data are obtained; and performing data evaluation on the remediation scheme by utilizing the remediation effect data to generate a cadmium-contaminated soil remediation scheme. According to the method, the performance of the repairing material, the pollutant migration rule and the repairing effect are accurately evaluated, and the scientificity and the reliability of the repairing scheme are improved.

The invention discloses a bio-organic fertilizer for repairing heavy metal cadmium in soil and a preparation method of the bio-organic fertilizer, and belongs to the technical field of organic fertilizers. The organic fertilizer is prepared from the following raw materials in parts by weight: 7-12 parts of a compound microbial agent, 30-40 parts of modified charcoal, 3-8 parts of sodium alginate, 6-8 parts of a chelating agent and 60-80 parts of decomposed edible fungus residues. The compound microbial agent is prepared from potassium-solubilizing paenibacillus mucilaginosus MSSW02, pseudomonas plecoglossicida and bacillus aryabhattai; the chelating agent is composed of calcium humate and nano-hydroxyapatite according to the mass ratio of 100: (3-5). The multi-component synergistic effect is achieved, the content of heavy metal in soil is effectively reduced, especially the content of heavy metal Cd, meanwhile, rich organic matter is contained, the physical and chemical properties of the soil can be remarkably improved, the water and fertilizer retention capacity of the soil is improved, and crop growth is promoted; the remediation effect on medium-light cadmium polluted farmland soil is good, and the growth promoting effect on crops is remarkable.

The invention discloses a microbial agent and a method for repairing cadmium-polluted rice field soil by using the microbial agent, relates to the technical field of repairing cadmium pollution of rice field soil, and solves the problem that the cadmium metal enrichment capacity of duckweed is limited due to the fact that the duckweed has certain endurance capacity to cadmium stress. The microbial agent comprises bacillus subtilis ATCC6633 and pseudomonas aeruginosa ATCC27853, and the mass ratio of the bacillus subtilis ATCC6633 to the pseudomonas aeruginosa ATCC27853 is 2: 1, and the method comprises the following steps: step 1, spreading the microbial agent on the surface layer of cadmium-polluted rice field soil, then mixing the microbial agent with the rice field soil, raking the rice field soil, adjusting the water-holding capacity of the rice field soil, applying a base fertilizer, and irrigating the rice field. According to the method, the cadmium tolerance of the duckweed can be promoted, so that the enrichment capacity of the duckweed on cadmium is promoted, the remediation capacity of the duckweed on cadmium-polluted soil is improved, the cadmium content in the soil can be reduced, and the content of metal cadmium in rice is also reduced through a competitive cadmium absorption way.

The invention discloses composite modified pig manure and sludge biochar, relates to the technical field of modified biochar, and mainly comprises pig manure and sludge. The invention also provides a preparation method of the compound modified pig manure and sludge biochar, pig manure and sludge are mixed and pyrolyzed to prepare the pig manure and sludge biochar, and the pig manure and sludge biochar is modified by sulfuric acid and a magnesium chloride solution to prepare the compound modified pig manure and sludge biochar. According to the composite modified pig manure and sludge biochar provided by the invention, pig manure and sludge are subjected to carbonization modification through a composite modification technology, so that heavy metal cadmium pollution is efficiently removed, and meanwhile, a new way is provided for resource utilization of organic wastes.

The remediation method for the moderately and severely cadmium-polluted rice field aims at strictly controlled cadmium-polluted rice fields, and is divided into two stages of strict control and safe utilization for remediation. In the strict management and control stage, an activating agent is applied to the soil in spring, then microalgae are inoculated, cadmium-enriched plants are planted, the plants are collected after being full of the microalgae, the plants are harvested when the plants grow to the enrichment extreme value, stubbles are reserved for growth, and the steps are repeated till winter; applying an activating agent in winter, planting green manure, and harvesting in spring in the next year; the process is cyclically carried out until the cadmium content of the soil is reduced to a safe utilization level. Entering a safe utilization stage, applying an activating agent in spring, inoculating nitrogen-fixing cyanobacteria, collecting the cyanobacteria after the cyanobacteria overgrow, and repeating the steps until the rice seedlings are transplanted; applying nitrogen-fixing blue-green algae, and planting rice; applying an activating agent after rice harvesting, planting winter green manure, and harvesting in next spring; the process is cyclically carried out until the cadmium content of the soil is reduced to a preferential protection level. The method is low in cost, high in remediation efficiency and good in effect, and a new way is provided for cadmium-polluted rice field remediation.

The invention relates to the technical field of soil regeneration, in particular to a method for degrading cadmium-polluted soil based on a heavy metal passivator, which comprises the following steps: S1, preparing PB-MgAl-LDH; s2, carrying out magnetic modification on the PB-MgAl-LDH; s3, preparing a passivating agent; and S4, soil remediation. Solid powder with a good specific surface area and adsorption activity is prepared through steady-state coprecipitation of pine barks and magnesium-aluminum hydrotalcite at a preferable specific growth position, a unique interlayer structure after magnetic modification has magnetism, negative charges are easily generated, adsorption of cadmium is accelerated for balancing the charges, and the adsorption efficiency of cadmium is improved. Meanwhile, lattice diffusion, isomorphous replacement and the like occur, so that the cadmium ion adsorbent shows relatively high ion exchange capacity and adsorption capacity to cadmium ions.

The invention discloses a method for repairing arsenic-cadmium combined polluted rice field soil, which comprises the following steps of: reducing the redox potential Eh value of the soil to-100 to-300mV by controlling the height of a flooded water layer of the polluted soil and adding a reducing agent, reducing arsenic in the soil into trivalent arsenic, and simultaneously constructing an indigenous microbial community with high arsenic methylation capability; oxidizing by draining and drying, methylating trivalent arsenic by indigenous microbial communities, and gradually volatilizing arsenic through methylation; and applying a carbon-based functional biological membrane mainly comprising a cadmium passivation flora to stably passivate cadmium. According to the method, the arsenic methylation capacity of microorganisms is improved by precisely regulating and controlling the Eh value, in-situ passivation of cadmium is enhanced through the synergistic effect of the carbon-based carrier and the composite flora, synchronous enhancement of arsenic methylation volatilization and cadmium biological membrane passivation is achieved, the difficulty that an arsenic and cadmium pollution treatment technology is'helpful 'is converted into an acting point of technical breakthrough, and the method is suitable for large-scale popularization and application. The arsenic and cadmium co-treatment of the combined polluted soil is realized.

The invention discloses stenotrophomonas 215 and application thereof in relieving cadmium stress of crops, and belongs to the technical field of microorganisms. The stenotrophomonas sp. Is separated from paddy field soil, and is named as stenotrophomonas sp. 215, and the preservation number of the stenotrophomonas sp. 215 is GDMCC (China General Microbiological Culture Collection Center) No.65475. The stenotrophomonas 215 provided by the invention is applied to cadmium-contaminated soil, can relieve the toxic action of cadmium stress on crop growth, especially for wheat production, can remarkably reduce the content of cadmium in wheat growing in the cadmium-contaminated soil by utilizing the strain, can remarkably improve the wheat yield, has obvious effects of relieving cadmium stress and promoting growth, and has good application prospects. The method is an environment-friendly alleviation measure.

The invention discloses alkali-producing cadmium-tolerant acinetobacter capable of increasing the pH value of soil and application of the alkali-producing cadmium-tolerant acinetobacter, and belongs to the technical field of microorganisms, the alkali-producing cadmium-tolerant acinetobacter is preserved in the China General Microbiological Culture Collection Center (CGMCC), the number of the alkali-producing cadmium-tolerant acinetobacter is CGMCC No.33619, and the alkali-producing cadmium-tolerant acinetobacter belongs to proteobacteria and pseudomonas. The strain can increase the environmental pH value from 6.0 to 8.0 through metabolism, and stably grows in an environment with the cadmium (Cd < 2 + >) concentration as high as 20 ppm. The strain can be applied to the fields of acid soil improvement, cadmium pollution remediation, industrial wastewater treatment, fermentation engineering and the like. The method has the advantages of being environmentally friendly, efficient, stable, applicable to multiple scenes and the like, and a novel microbial resource is provided for heavy metal pollution treatment and soil ecological restoration.

The invention discloses a method for improving cadmium accumulation and transport capacity of sedum plumbizincicola, and relates to the field of plant heavy metal pollution remediation. The method comprises the following steps: preparing a selenium solution with the selenium ion concentration of 5 [mu] M, adding the selenium solution into the cadmium-polluted water environment, planting sedum plumbizincicola seedlings in the cadmium-polluted water environment, and carrying out cultivation management; plant pretreatment: culturing sedum plumbizincicola seedlings in non-polluted soil for at least three generations, selecting sedum plumbizincicola plants which are uniform in size and healthy in growth vigor, and pre-culturing the sedum plumbizincicola plants in a Hoaglands nutrient solution for two weeks for rooting; the healthy plants are transferred into Hoagland nutrient solution containing selenium solution to be cultured, and the plants are harvested after 28 days. According to the method, the high-concentration cadmium polluted water environment is simulated, and selenium is applied in the growth period of the sedum plumbizincicola, so that absorption and enrichment of the sedum plumbizincicola on cadmium are promoted, the plant biomass is improved, the toxic effect of cadmium on plants is relieved, and efficient remediation of the sedum plumbizincicola on the cadmium polluted environment is achieved.

The invention discloses a cadmium-contaminated soil remediation method which comprises the following steps: performing seedling vernalization prevention treatment on sedum plumbizincicola branches to obtain sedum plumbizincicola seedlings; then the sedum plumbizincicola seedlings are transplanted into the cadmium-contaminated soil, in the planting and growing period of the sedum plumbizincicola seedlings, the environment temperature is controlled to range from 8 DEG C to 25 DEG C, and field management is conducted regularly; and when the branches of the sedum plumbizincicola do not grow obviously within 15-20 days, harvesting the sedum plumbizincicola, and removing the harvested object from the field. According to the method, through anti-vernalization treatment and planting of the sedum plumbizincicola, the phenomenon that most plants die after flowering due to low-temperature vernalization of the sedum plumbizincicola can be avoided, so that the vegetative growth cycle of the sedum plumbizincicola is effectively prolonged, and then the absorption and remediation efficiency of cadmium in the cadmium-contaminated soil is improved.

The invention discloses a cyanide-free cadmium plating bath solution, a preparation method of the cyanide-free cadmium plating bath solution and application of the cyanide-free cadmium plating bath solution in cadmium plating. The cyanide-free cadmium plating bath solution comprises the following components according to the concentration: 50-70 g / L of cadmium chloride, 180-250 mL / L of an etidronic acid aqueous solution, 16-33 g / L of potassium sodium tartrate, 0.01-0.2 g / L of polyethylene glycol, 0.01-0.2 g / L of a brightener and 0.01-0.1 g / L of an additive HY. The method has the advantages that the bath solution is environment-friendly and non-toxic, wastewater treatment is simple, a plating layer is high in deposition speed, fine in crystallization and good in binding force, the problems that cyanide cadmium plating pollutes the environment, EDTA cadmium plating is poor in stability and the like are effectively solved, and the method has good application value and economic and social benefits.

The invention relates to a biochar material for repairing cadmium and tetracycline combined pollution in a water body as well as preparation and application of the biochar material, and belongs to the technical field of water body pollution repairing. Comprising the following steps: (1) cleaning, drying and grinding plant tissues of solanum nigrum plants after the cadmium-polluted soil is repaired by fungi and solanum nigrum, so as to obtain solanum nigrum plant tissue powder; and (2) pyrolyzing the black nightshade plant tissue powder at 400-600 DEG C for 1-3 hours, cooling to 20-30 DEG C, and grinding to obtain the biochar material for repairing cadmium and tetracycline combined pollution in the water body. According to the invention, the plant tissue of the nightshade plant after the cadmium-polluted soil is repaired by the combination of fungi and nightshade is used as the raw material of the biochar material for the first time, so that the resource utilization of the polluted soil repairing plant is realized. The problem of plant treatment after polluted soil remediation is solved, consumption of extra resources is avoided, and the sewage treatment cost is greatly reduced.

The invention relates to the technical field of soil heavy metal pollution remediation, in particular to a heavy metal cadmium pollution remediation neural network model, which comprises the following steps: S1, acquiring and preprocessing environmental factor data; s2, constructing a cadmium content prediction model: establishing an initial model structure, carrying out model training based on the preprocessed environmental factor data, calculating the contribution degree of each environmental factor in the model by utilizing an interpretability analysis method, and constructing an optimization objective function with prediction precision and model complexity by taking the environmental factor contribution degree as an interpretability constraint; performing iterative optimization on the model structure based on the optimization objective function to obtain a cadmium content prediction model; and S3, predicting the cadmium content of the rice based on the cadmium content prediction model, and optimizing agricultural measures based on a prediction result. By means of the scheme, accurate prediction and scientific explanation of the cadmium content of the rice are achieved, and the practicability of the model in farmland heavy metal cadmium pollution remediation is improved.

The invention discloses a method for reducing cadmium accumulation of rice and improving salt tolerance. According to the invention, the CDS sequence expression of the OsRBOHA is driven by the OsNAC4 promoter, so that the avoidance capability of the rice to non-uniform stress is remarkably improved, and the stress exposure of a root system is reduced. A soil culture experiment shows that the pOsNAC4: OsRBOHA strain reduces cadmium accumulation of overground parts and grains in non-uniform cadmium polluted soil, and enhances salt tolerance of the overground parts in non-uniform salt stress soil.

The invention relates to the technical field of soil cadmium remediation, in particular to a soil Cd recognition and remediation method based on mulberry root exudates and microorganisms. According to the method, spatial microscopic image frames of rhizosphere microflora are divided through a community structure, community node increment updating calculation of adjacent time sequences is executed, the transition recombination frequency of the rhizosphere microflora is obtained, and the transition color of the actual concentration content of root exudates is rendered based on a metal pollution level system and the transition recombination frequency. Generating a stress level heat model of the soil cadmium gradient in the target restoration area; and according to the stress level popularity model, carrying out popularity color analysis and identification on the soil cadmium pollution of the target restoration area, and generating a global stress identification result of the soil cadmium. According to the method, rapid identification of cadmium pollution enrichment can be realized by utilizing the synergistic response between mulberry root exudates and rhizosphere microorganisms, and a repair regulation and control plan is made, so that the cadmium pollution degree is reduced, the soil structure and fertility are optimized, and a safer and healthier environment is provided for plant growth.

The invention belongs to the technical field of fertilizers, and particularly relates to an alkaline biochar coated slow release fertilizer and a preparation method and application thereof, the preparation method comprises the following steps: S1, preparing modified biochar: modifying traditional Chinese medicine residues with calcium chloride, drying, and putting into a vacuum tube furnace to prepare the alkaline biochar; s2, preparation of fertilizer glue beads: dissolving a fertilizer in a sodium alginate solution, standing and defoaming, dropwise adding the mixed solution into a calcium chloride solution, and cross-linking to obtain the fertilizer glue beads; s3, coating and granulating: uniformly coating the modified biochar and fertilizer mixture on fertilizer glue beads by using a binder to obtain the fertilizer. The alkaline biochar coated slow-release fertilizer disclosed by the invention is high in utilization rate and lasting in fertilizer efficiency, and can relieve soil acidification, reduce cadmium pollution, reduce fertilization cost and environmental pollution caused by the fertilizer, effectively promote crop growth and improve crop yield and quality.

The invention provides an efficient reduction remediation method for cadmium pollution of rice field soil, and relates to the technical field of soil remediation. The efficient decrement remediation method for rice field soil cadmium pollution comprises the steps that high-cadmium-absorption-accumulation rice is planted in a target rice field; after the cadmium high-absorption accumulation rice turns green in the seedling stage, a deep water management process is conducted on the target rice field till the cadmium high-absorption accumulation rice is mature; the deep water management process comprises the step of repeatedly and periodically carrying out dry-wet alternate treatment and field drying on the target rice field; and harvesting the rice with high cadmium absorption and accumulation and separating from the field. According to the remediation method, on the premise that the structure and attributes of the rice field are not changed, according to the water requirement rule of the rice growth cycle, deep water fine management (water management cycle, frequency, strength and parameter control) is adopted, soil cadmium is activated, rice high absorption and accumulation of cadmium are enhanced, and efficient decrement remediation of soil cadmium pollution of the rice field is achieved.

The invention relates to the field of environment, resource utilization and agricultural biotechnology, in particular to application of a composite solid phosphate-solubilizing bacterial agent to remediation of cadmium-contaminated soil and improvement of soil quality, in the application, the composite solid phosphate-solubilizing bacterial agent comprises phosphate-solubilizing bacteria, bone black, a culture medium and an organic matrix; the phosphate solubilizing bacteria are pantoea agglomerans CT-3 and enterobacter hormaechei HS-6; the composite solid phosphate-solubilizing bacterial agent is applied to Cd-polluted soil, the bio-availability of Cd in the soil is reduced through synergy of pantoea agglomerans CT-3, enterobacter hormaechei HS-6 and micron-nano multi-stage bone black, and meanwhile, the soil quality is improved. On one hand, the application can effectively promote conversion of insoluble phosphate into soluble phosphate, so that the content of available phosphorus in soil is increased by 98.19%; on the other hand, soil heavy metal Cd can be fixed, so that the content of available Cd in the soil is reduced by about 52.50%, and the soil remediation agent has excellent Cd fixation capacity, can relieve Cd stress of crops, and has good application value in the aspects of farmland Cd pollution remediation, soil quality improvement and environmental protection.

The invention provides a method for reducing cadmium content in rice under cadmium stress, a rice adjusting method and application. By adding the exogenous water-soluble organic selenium into the cadmium-polluted farmland soil, the exogenous water-soluble organic selenium is proved to have the effects of promoting the growth of the rice under the cadmium stress and relieving the cadmium stress of the rice; the exogenous water-soluble organic selenium is beneficial for improving the activity of antioxidant enzymes of the rice and reducing oxidative damage, and has a positive effect on relieving cadmium toxicity of the rice; in addition, the exogenous water-soluble organic selenium is beneficial to reducing direct migration of cadmium from rice roots to brown rice and effectively reducing the biological enrichment coefficient of Cd in the brown rice; the exogenous water-soluble organic selenium can promote generation of iron plaque on the root surface of the rice in the mature period and form an effective barrier for Cd absorption of the rice, so that accumulation of cadmium in rice plants is reduced, and toxicity of cadmium to the rice is reduced.

The invention belongs to the technical field of modern agricultural precise planting and plant nutrition regulation and control. The invention provides a method for precisely applying selenium to oilseed rape leaf surfaces based on dynamic regulation and control in a growth period, enriching selenium, reducing cadmium and increasing yield. A sodium selenite solution is sprayed to the leaf surfaces in the key growth period of oilseed rape. The method can effectively improve the selenium content of each part of the oilseed rape, reduce the cadmium content of grains and guarantee the yield, is suitable for safe production of oilseed rape replanting in medium-light cadmium-polluted rice fields in the south of China, can be widely applied to standardized production of selenium-rich oilseed rape in main winter oilseed rape producing areas in the Yangtze River basin, and has wide application prospects. The method has important practical significance in improving agricultural quality and efficiency, guaranteeing food safety and promoting income increase of farmers.

The invention discloses a method for creating cadmium-resistant rice with low grain cadmium accumulation and application. The rice oshma3oslct1 double mutant expressing the Cd binding autophagy adapter protein AIM-SpMTL-GFP is constructed through CRISPR-Cas9, so that the transfer of Cd from xylem to phloem and the accumulation of Cd in root vacuoles are reduced, meanwhile, the Cd binding autophagy adapter protein AIM-SpMTL-GFP can also accumulate cadmium in protoplast vacuoles of leaves, the yield and quality of rice grains are not influenced, and the yield and quality of the rice grains are greatly improved. Cd accumulation of grains is reduced, and Cd is enriched into straws at non-edible parts, so that industrial treatment is facilitated. The cadmium-resistant rice with low grain cadmium accumulation can reduce cadmium pollution in a food chain, so that the harm of cadmium to a human body is reduced.

The invention discloses a seed coating containing an arbuscular mycorrhizal inoculant. The seed coating is prepared from the following components in parts by weight: 25 to 35 parts of the arbuscular mycorrhizal inoculant, 35 to 45 parts of a soil conditioner, 15 to 20 parts of talcum powder and 15 to 20 parts of polyvinyl acetate. The invention further provides a preparation method of the seed coating containing the arbuscular mycorrhizal inoculant and application of the seed coating to reduction of soil heavy metal pollution, increase of disease resistance and stress resistance of crops and promotion of crop growth. The seed coating containing the arbuscular mycorrhizal inoculant wraps the surfaces of plant seeds, provides good nutritional ingredients for growth and development of the seeds, and is beneficial to improving the germination rate of the seeds under heavy metal cadmium stress, reducing soil heavy metal cadmium pollution, improving soil quality, increasing soil fertility and improving disease resistance and stress resistance of crops; growth of seedlings is promoted, and crop quality and yield are improved.

The invention discloses a magnetic iron mineral and phosphate tailing material and application thereof in treatment of arsenic and cadmium pollution. A low-cost phosphate tailing material is taken as an object, and an environmental functional material loaded with magnetic gamma-Fe2O3 and other iron minerals is prepared by adopting a method of'rapid thermal activation-primary addition of a modifying agent-mineral phase conversion '. The magnetic iron mineral and phosphate tailing material can efficiently adsorb cadmium ions, arsenate ions and arsenite ions, has a synchronous adsorption effect on coexisting cadmium ions and inorganic arsenic, and can be used as an efficient passivation repair material for arsenic-cadmium combined polluted soil. The material also has magnetism, is easy to separate and recover, and also can be combined with a magnetic separation technology to serve as a material for synchronously removing arsenic and cadmium pollutants in a water body or soil.

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 invention discloses alcaligenes faecalis X4 and application thereof, the strain is preserved in China Center for Type Culture Collection (CCTCC) on May 8, 2025, the address is Wuhan University, Wuhan, China, and the preservation number is CCTCC M 2025998. The degradation rate of the alcaligenes faecalis X4 to flumorph with the concentration of 50 mg / L exceeds 70% within 72 h, and the maximum tolerance concentration to cadmium is 120 mg / L. The strain provides powerful technical support for treatment of combined pollution of flumorph and cadmium, and has important significance for solving the problem of complex environmental pollution.

The invention relates to the field of soil remediation, in particular to a method for preventing and controlling transfer of cadmium in hyperaccumulators, which comprises the following steps: planting annual ryegrass in cadmium-containing soil, and applying a leaf surface preventing and controlling agent to the annual ryegrass. According to the method, the leaf surface resistance and control agent is added into the annual ryegrass, the enrichment capacity of the underground part of the plant to cadmium is enhanced through the leaf surface resistance and control agent, transfer of cadmium of the underground part of the plant to the overground part of the plant is reduced, a large amount of biomass polluted by cadmium is prevented from being generated, and the cadmium of the overground part of the plant meets the regulation of pollutant limit in food in the national food safety standard.

The invention discloses a rice cadmium pollution analysis method and system based on a near infrared technology, and the method comprises the steps: constructing a test scheme database, and setting a plurality of rice pollution test groups; performing rice sample collection on each rice pollution test group and selecting rice pollution test samples meeting expectation; carrying out spectrum acquisition and preprocessing the acquired spectrum data to obtain a preprocessed spectrum data set; extracting a full-wavelength reflectivity value of each rice pollution test sample, introducing a CARSA algorithm to carry out global feature iterative screening, and constructing a rice cadmium pollution spectral feature database; constructing a rice cadmium pollution prediction model, and training the rice cadmium pollution prediction model based on the rice cadmium pollution spectral feature database; dividing the target detection area into a plurality of sub-areas for rice sample sampling and spectrum acquisition, predicting the rice cadmium pollution degree of each sub-area, and performing pollution tracing. And high-precision and universal cadmium pollution rapid detection and pollution source positioning are realized.

The invention relates to the field of heavy metal contaminated soil remediation, in particular to a method for hyperaccumulating cadmium in soil by plant roots, plants are sown in the cadmium contaminated soil, and soil remediation is achieved by enriching cadmium in the soil by the plants. The plants are one or more of annual ryegrass, herba houttuyniae and Russian feed vegetables. The method comprises the following steps: investigating the dry matter accumulation amount, the heavy metal enrichment coefficient (BCF) and the transport factor (TF) of different plants, and screening out the plants of which the roots can hyperaccumulate cadmium; by adding a microbial composition and a chelating agent into the screened plants, the cadmium enrichment capacity of the plants is further improved. According to the method, the plants with the roots capable of achieving hyperaccumulation of cadmium are planted in the cadmium-contaminated soil, and remediation of the cadmium-contaminated soil is achieved through hyperaccumulation of the roots of the plants; the enrichment effect of the plants on the cadmium in the soil is enhanced by adding the microbial complex inoculant and the chelating agent to the roots of the plants.