63 results about "Soil cadmium" patented technology

The invention belongs to the technical field of biology, and particularly relates to plant growth promoting performance of two alkali-producing strains, namely, Plutalophilous rhizobium and Pseudomonas moorsei, and application of the two alkali-producing strains to cadmium fixation and fertility increase of soil. The invention provides a multifunctional alcaligenes, which is any one of the following strains: Pentazobacterium mionense WW22, the preservation number of which is CGMCC (China General Microbiological Culture Collection Center) No. 27718, and the preservation number of which is CGMCC No. 27718. The invention discloses pseudomonas mohnii WW2, and the preservation number of the pseudomonas mohnii WW2 is CGMCC (China General Microbiological Culture Collection Center) No.27716. The invention also provides application of the strain for fixing cadmium and increasing fertility. The strain disclosed by the invention can promote the reduction of the effectiveness of cadmium in soil and increase the nutrient content in the soil, provides a technical basis for ensuring the safe production and utilization of crops in a cadmium-polluted farmland, and has a wide application prospect.

The invention relates to the technical field of microorganisms, and particularly discloses a nitrogen-fixing and cadmium-reducing microbial agent as well as a preparation method and application thereof. The microbial agent consists of bacillus pseudomycoides, lactococcus lactis, azotobacter chroococcum and biochar, wherein the biochar is obtained by pyrolyzing and carbonizing rice straws. The bacillus pseudomycoides can reduce the bio-availability of soil cadmium; lactococcus lactis can secrete a large number of biological active substances such as exopolysaccharides and enzymes, and the activity of other microorganisms is stimulated and improved; azotobacter chroococcum converts nitrogen in air into ammonium, amino acid and peptide which can be utilized by plants and promotes plant growth, and released metallothionein contains free sulfydryl which is combined with Cd ions, so that a stable sulfide compound is formed. The biological carbon adsorbs and fixes the three bacteria, so that the microorganisms can continuously and effectively play a role and have a mutual synergistic effect, the fixation of Cd in the soil is further enhanced, the availability of nitrogen is improved, and the plant growth is effectively promoted.

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 relates to the technical field of cadmium-reducing soil conditioners, in particular to an acid soil cadmium-reducing conditioner and intelligent production device.The acid soil cadmium-reducing conditioner comprises a supporting assembly and a tank body, a groove is formed in one side of the tank body, a discharging valve is arranged at the bottom end of the tank body, a tank cover is arranged at the upper end of the tank body, a material overturning assembly is arranged in the tank body, and a vertical filter press is arranged on one side of the tank body; a flash dryer is arranged on one side of the vertical filter press, the vertical filter press is connected with a discharging valve at the bottom end of the tank body through a connecting pipe, a material conveying mechanism is arranged on one side of the tank body, a fixing block is arranged in the material conveying mechanism, a fixing cylinder is arranged at the bottom end of the fixing block, a through hole is formed in one side of the fixing cylinder, a material conveying pipe is arranged on one side of the fixing cylinder, and a feeding hopper is arranged on the material conveying pipe; a fixing block is arranged in the tank body, an auxiliary gear is arranged on the fixing block, a screw rod is arranged on the auxiliary gear, a mixing mechanism is arranged in the tank body, a limiting ring is arranged in the mixing mechanism, a servo motor is arranged in the mixing mechanism, a stirring assembly is arranged at the output end of the servo motor, and a transmission rod is arranged in the stirring assembly.

The invention relates to the technical field of planting environment detection, in particular to a pepper planting environment anomaly detection method based on data analysis. Comprising the following steps: obtaining a soil root system coupling characterization value based on the time span difference between a soil cadmium ion concentration fluctuation sequence and a soil pH value fluctuation sequence and the time span difference between a zanthoxylum bungeanum root system cadmium ion concentration fluctuation sequence and a zanthoxylum bungeanum root system pH value fluctuation sequence and the same sequence subsequence, a soil root system propagation direction characterization value is obtained based on a starting moment difference and a range difference between a soil cadmium ion concentration fluctuation sequence and a pepper root system cadmium ion concentration fluctuation sequence, and a fixed experience lag order is adjusted based on a soil root system coupling characterization value and the soil root system propagation direction characterization value to obtain an optimized lag order. And performing anomaly detection on the soil cadmium content of the pepper planting detection area based on the ARMA model with the order being the optimized lag order. Moreover, the method can improve the detection accuracy of the abnormality of the pepper planting environment.

The invention relates to the technical field of fertilizers, in particular to a fertilizer for relieving soil cadmium pollution and a preparation method thereof. The fertilizer for slowing down cadmium pollution of soil comprises the following raw materials in parts by weight: 30-50 parts of a modified charcoal-based carrier, 10-20 parts of a compound microbial agent, 15-25 parts of a nano mineral passivator, 5-10 parts of a chelated trace element compound fertilizer and 10-15 parts of potassium humate. Through a specific cascade domestication method, the compound bacterial system gradually adapts in a cadmium-containing environment and generates a synergistic metabolism mechanism, then the compound bacterial system is combined with the nano mineral modified by organic intercalation, and the nano mineral not only has strong adsorption capacity to cadmium, but also has strong adsorption capacity to cadmium. And the organic groups modified on the surface can also provide colonization sites and nutrition signals for the domesticated functional bacteria to form a triple barrier of'nano mineral physical passivation-functional bacteria biological resistance and control-metabolite complexing and curing ', so that the long-term effect and stress resistance of passivation are remarkably improved.

The invention belongs to the technical field of heavy metal pollution treatment, and discloses a method for reducing soil cadmium activity and wheat grain cadmium content. According to the method, the low-cadmium-accumulation wheat variety is selected, the composite conditioner is applied, the low-cadmium-accumulation wheat variety is Jimai 22, and the composite conditioner is composed of mineral source potassium fulvate and zinc fertilizer. The complex passivation effect of humic acid components in mineral source potassium fulvate on soil heavy metal is utilized, the ion antagonism effect of zinc and cadmium and the low cadmium accumulation characteristic of Jimai 22 are combined, the cadmium content of wheat grains is synergistically reduced to 0.1 mg / kg or below, meanwhile, the cadmium content of the soil can be remarkably reduced, and the soil with cadmium exceeding the standard can be repaired. The treatment method provided by the invention has the advantages of simple operation, easily available raw materials, low cost, stable synergistic cadmium reduction effect and the like.

The invention discloses a rice-shrimp co-cropping-based cadmium-polluted rice field safe utilization method, which comprises the following steps that 1, a cadmium-polluted rice field to be treated is selected, the cadmium content in the cadmium-polluted rice field to be treated is 0.40-1.50 mg / kg, and the pH range of the cadmium-polluted rice field is 5.5-6.5; 2, a compound fertilizer containing urea, diammonium phosphate and potassium sulfate is applied to the cadmium-polluted rice field to be treated, and rice seedlings are transplanted according to the line spacing of 20-25 cm and the plant spacing of 10-15 cm after ploughing and uniform mixing; 3, after the seedlings turn green, young Australian freshwater lobsters with the body length of 2-5 cm are put in; 4, harvesting rice and lobsters in the rice mature period. The invention aims to significantly reduce the cadmium content in rice through the rice-shrimp co-cropping system and reduce the effectiveness of soil cadmium.

The invention discloses a phosphate-solubilizing bacterium with dual functions of phosphate solubilizing and passivation, a microbial agent prepared from the phosphate-solubilizing bacterium and application of the phosphate-solubilizing bacterium, the phosphate-solubilizing bacterium is Bacillus sp and is preserved in Guangdong Microbial Culture Collection Center, and the preservation number of the phosphate-solubilizing bacterium is GDMCC NO: 66609. Through multiple rounds of screening, the strain capable of dissolving phosphorus, producing urease, IAA and siderophore, promoting corn growth and improving cadmium and lead tolerance of plants is obtained, the strain can greatly improve underground biomass of corn, meanwhile, urease, IAA and siderophore are produced, effectiveness of soil cadmium is reduced, and soil fertility is improved. The fertilizer can increase the yield of corn, improve the soil fertility and improve the market competitiveness of agricultural products. The phosphate-solubilizing bacterium disclosed by the invention is easy to culture and apply on a large scale, simple and convenient to operate, easy to accept and apply by agricultural producers, and relatively high in practicability. The strain and the preparation have relatively high agricultural application prospects and economic values.

The invention belongs to the technical field of soil heavy metal pollution remediation, and discloses an acid soil cadmium-reducing modifier, a preparation method, a use method and application, the modifier is formed by mixing sulfydryl minerals, biochar and a compound organic fertilizer according to a certain configuration, the sulfydryl mineral is prepared from calcium carbonate, bentonite and 3-mercaptopropyl triethoxy silane. When the soil conditioner is used, the soil conditioner is uniformly applied to a soil plough layer by 0-20 cm manually or mechanically, and the applied soil conditioner accounts for 1-5% of the mass of soil or is 180-220 kg / mu. The soil cadmium-reducing modifier can obviously reduce the effective state content of heavy metal cadmium in the soil, so that the cadmium content in planted rice grains is obviously reduced, the organic matter content of the soil is obviously increased, the ecological environment of polluted farmland soil is improved, the growth of the rice is promoted, and the yield of the rice is increased. The soil conditioner disclosed by the invention is simple to prepare and environment-friendly to soil, and safe utilization of cadmium-polluted farmland soil can be realized.

The invention discloses a method for cultivating low-cadmium accumulation rice through CRISPRCas9 saturated editing of an OsHMA3 promoter, and belongs to the technical field of crop molecular breeding. According to the method, gene editing is carried out on an upstream 500bp region of an OsHMA3 gene of a rice variety ZH11 through an agrobacterium-mediated transformation method, and on the premise that the agronomic traits of rice are not affected, the cadmium interception capacity of a root system is enhanced, the cadmium accumulation amount in overground parts and grains is reduced, and the yield of the rice is improved. The HMA3-Pro3 mutant does not influence the absorption and accumulation of necessary elements such as zinc, manganese, iron and the like. The invention provides an efficient and safe non-transgenic low-cadmium rice cultivation technology, provides technical support and excellent varieties for safe utilization of cadmium-polluted farmland, and provides a new solution for solving the food safety problem caused by soil cadmium pollution.

This invention belongs to the field of heavy metal pollution remediation technology, and relates to the preparation and application of a cadmium passivating agent for weakly alkaline soil. The weakly alkaline soil cadmium passivating agent mainly comprises the following components by weight: 30-50 parts of a mineral complex, 40-60 parts of a bioactive component, and 5-15 parts of an auxiliary stabilizer. The mineral complex includes natural sepiolite, calcium-based bentonite, and a polyether-polyester diblock copolymer; the bioactive component includes microbial agents, phosphorus-modified biochar, lecithin, and phosphatidylserine; and the auxiliary stabilizer includes nano-hydroxyapatite and a chitosan-grafted polyaspartic acid complex. This weakly alkaline soil cadmium passivating agent exhibits excellent remediation effects on cadmium in contaminated soil, effectively preventing or reducing the entry of cadmium and other heavy metals into the food chain, and has significant market potential.

The present application belongs to the field of agricultural pest control, and particularly relates to a method for improving the content and insecticidal activity of exogenous insecticidal protein of insect-resistant transgenic cotton. The method is realized by the following steps: maintaining the soil cadmium concentration at 1-5 mg / kg when the cotton is at the three-leaf stage; and maintaining the soil cadmium concentration at 1-4 mg / kg when the cotton is at the five-leaf stage. The method provided by the present application can significantly improve the content and insecticidal effect of exogenous insecticidal protein of insect-resistant transgenic cotton, and enhance the insecticidal activity against cotton bollworms. The method provided by the present application can improve the control effect on pests while controlling cadmium pollution when planting transgenic insect-resistant cotton on land contaminated by a certain concentration of cadmium, and reduce the use of insecticides. Therefore, the present application provides an effective reference for improving the control effect on pests when planting insect-resistant transgenic cotton on land contaminated by cadmium, and has important practical value and significance.

The invention relates to an in-situ preparation method and application of an earthworm cast-based blocking and controlling agent for soil Cd pollution, and the preparation method comprises the following steps: (1) uniformly mixing cow dung, a bulking agent and biochar, and adjusting the water content to 55-75% to obtain a mixture; (2) performing primary fermentation on the mixture obtained in the step (1) to obtain an earthworm bed base material; (3) spreading the earthworm bed base material obtained in the step (2) in a strip shape, putting a plurality of adult earthworms, and culturing to obtain earthworm raw manure; and (4) carrying out secondary fermentation, drying, crushing and sieving, stirring, heating and granulating, cooling, secondary sieving, packaging and inspecting on the earthworm cast collected in the step (3) to obtain the target earthworm cast-based blocking and controlling agent. The earthworm cast-based blocking and controlling agent is prepared through multi-step process optimization in-situ production, multiple functions of earthworm cast in soil Cd pollution remediation, nutrient improvement and plant growth promotion are achieved, and then the goals of soil heavy metal pollution relief treatment and high-yield and high-quality production are achieved.

The application belongs to the field of soil remediation, and discloses a preparation method of selenium-rich biochar capable of reducing soil cadmium bioavailability and application of the selenium-rich biochar, the preparation method of the selenium-rich biochar comprising the following steps: taking biomass grown in a selenium-rich area, air-drying and grinding, and then calcining at 400-800 DEG C for 1-3 hours to obtain the selenium-rich biochar; and application of the selenium-rich biochar in soil cadmium pollution treatment is disclosed.The preparation method of the selenium-rich biochar is simple, the reaction is mild, the safety is high, the environmental pollution is small, and the selenium-rich biochar contains a certain amount of selenium and can reduce soil cadmium bioavailability to a certain extent.

The invention discloses a cadmium and arsenic combined pollution plant response dynamic monitoring system based on time sequence image analysis. The system comprises a multi-temporal image acquisition module, a self-adaptive registration engine, a response feature decoupling extraction module, an illumination environment normalization module and a pollution early warning decision module. View angle offset is eliminated through timing sequence image accurate registration, and pollution response and natural growth are separated through response feature decoupling. Non-pollution interference is eliminated through illumination environment normalization, an early warning system can recognize pollution signals when the soil cadmium and arsenic concentration is lower than the national standard limit value 50% through pollution early warning decision, the monitoring accuracy rate reaches 95% or above, the pollution risk is found 3-5 weeks ahead of time compared with a traditional method, and an effective technical means is provided for soil heavy metal pollution prevention and control.

The invention relates to the technical field of woody peat humus compositions, in particular to an iron-modified woody peat humus composition and application thereof in synchronous passivation of cadmium and arsenic in soil, and the iron-modified woody peat humus composition comprises the following raw materials: woody peat, a composite iron modifier, ammonium sulfate, monopotassium phosphate and microbial fermentation liquor. The composite iron modifier overcomes the problem that free iron is easy to precipitate in acid soil, and ensures stable release and efficient utilization of iron ions; secondly, iron ions can be subjected to complex reaction with carboxyl, phenolic hydroxyl and other functional groups in humic acid to form a stable organic-inorganic compound; zeolite can remarkably improve the cadmium adsorption capacity and enhance the dispersity of iron active components through ion exchange, and cadmium and arsenic are synchronously and efficiently passivated.

The application relates to the cross field of photocatalytic composite materials and soil environment remediation technology, and specifically discloses a three-dimensional graphene aerogel loaded cadmium sulfide quantum dot composite material, a preparation method and application of the composite material in soil cadmium pollution remediation, the composite material is composed of a three-dimensional interconnected porous sulfur-doped graphene aerogel skeleton and in-situ anchored cadmium sulfide quantum dots, the cadmium sulfide quantum dots have a particle size of 2-10 nm, a loading amount of 10 wt%-25 wt%, a surface sulfur vacancy density of 5%-8%, the skeleton has a sulfur atom content of 2 at%-5 at%, and the two are connected through a carbon-sulfur-cadmium covalent bridge; the material has a hierarchical porous structure with longitudinal through macropores of 20-80 mu m and intrawall mesopores of 2-20 nm, the material is prepared by adopting a three-stage programmed hydrothermal method, and a sulfur source is released in stages by 30%-50% excess thioacetamide to drive the formation of an epoxy group nucleophilic ring-opening anchor point, in-situ nucleation of quantum dots and generation of surface sulfur vacancies.

The utility model discloses a screening device for soil cadmium pollution detection, which comprises a device main body, an assembling groove is arranged at the center of the device main body, a lifting frame is assembled in the assembling groove, a driving mechanism in transmission connection with the lifting frame is assembled in an inner cavity of the device main body, and a screening cylinder is assembled in the lifting frame. A sealing cover assembly is assembled between the lifting frame and the screening barrel. The soil screening device is used for screening soil in a laboratory when cadmium pollution of the soil is detected, the driving mechanism is arranged, the lifting frame is driven by the driving mechanism to move up and down in a reciprocating mode, the screening barrel is made to complete screening operation on the soil, and compared with traditional manual screening, the labor intensity of operators can be relieved, and meanwhile the screening efficiency is improved.

This invention discloses a methylbacterium XC1 strain screened from the rhizosphere soil of contaminated paddy fields. Methylbacterium XC1 can stably survive in cadmium-contaminated soil and effectively fix available cadmium in the soil, thereby reducing the content of available cadmium in the soil and achieving effective remediation of cadmium pollution in the soil.

This invention discloses a combined microbial agent and its method for promoting plant growth and soil remediation. The combined microbial agent comprises an inoculum of the arbuscular mycorrhizal fungus *Gloydius juvenilee* and a fermentation broth and / or suspension of *Methylobacterium XC1*. The combined microbial agent can increase rice seedling height, root length, and biomass accumulation, inhibit the migration of cadmium from cadmium-contaminated soil to the aboveground parts of rice seedlings, and simultaneously promote the conversion of soil cadmium to a stable / residual state with low bioavailability.

The application discloses a soil cadmium environmental ecological toxicity data screening processing method and application, and comprises the following steps: S1, obtaining ecological toxicity data, S2, screening data, S3, processing data, the screening processing method can obtain high-quality data, and the data is processed to a uniform level, which is more convenient for analysis and calculation; through the simulation of the species sensitivity distribution model by using the screened data, fitting parameters can be obtained, and the sensitivity distribution of ecological species to pollutants can be mastered to a large extent according to limited ecological toxicity data.

The invention relates to a method for repairing cadmium-polluted soil by using hyperaccumulator nightshade, which comprises the following steps: S1, experimental design: transplanting nightshade seedlings into polluted soil with different cadmium concentrations, setting a plurality of cadmium concentration gradients, and applying nitric oxide (NO) solutions with different concentrations in the growth period of nightshade; s2, data processing and analysis: measuring biomass, cadmium content and stress resistance index of each organ of the black nightshade and soil cadmium content, and carrying out statistical analysis. Compared with a traditional contaminated soil treatment method, the technical scheme has the advantages of being low in treatment cost, small in work amount, high in operability, easy to popularize in a large area and the like.

Provided are Citrobacter freundii and the use thereof. The Citrobacter freundii has a high cadmium tolerance and the function of enhancing selenium bioavailability. The strain is classified as and named Citrobacter freundii DS, which has been deposited in the CCTCC on 26 May 2022. The strain has a high tolerance to the heavy metal cadmium. The strain can still grow under the conditions of a Cd2+ concentration of 6 mM, reaching the maximum biomass at 40 h. By means of applying the strain to cadmium-contaminated soil, the proportion of exchangeable cadmium and the content of available cadmium in the soil can be significantly decreased, while significantly increasing the content of soluble selenium and available selenium in the soil. By means of performing a rice pot experiment, the cadmium bioaccumulation factor in various parts of rice is further reduced, while increasing the selenium bioaccumulation factor and translocation factor. The strain has significant effects in the applications of remediating cadmium-contaminated soil, enhancing the bioavailability of selenium and promoting crop growth.

The invention discloses a method for preventing and controlling cadmium accumulation of rice and wheat through combined application of calcium carbonate and zinc-manganese loaded organic fertilizer. According to the method, calcium carbonate and the zinc-manganese loaded organic fertilizer are jointly applied to the Cd-polluted farmland soil before rice planting, multiple mechanisms such as pH improvement and soil Cd activity reduction, Cd activation in the water drainage stage through zinc and manganese resistance and control, Cd absorption of crops through ion competition and slow release of zinc and manganese through the organic fertilizer are integrated, and Cd accumulation of rice and wheat grains can be prevented and controlled at the same time; the problem that an existing single-component soil conditioner is unstable in cadmium reduction effect in a complex system of rice and wheat rotation is effectively solved. According to the method, Cd accumulation of rice and wheat grains can be stably and continuously reduced within three years through one-time application of the calcium carbonate and the zinc-manganese loaded organic fertilizer, and the method is suitable for safe utilization of acidic Cd polluted farmlands in rice-wheat rotation areas in China.

The invention discloses modified radix asparagi straw biomass charcoal as well as a preparation method and application thereof, and relates to the technical field of environmental protection and biology. The preparation method comprises the following steps: carrying out modification treatment on radix asparagi straws by using a binary modifier containing a nitrogen element and a phosphorus element, and carrying out drying treatment, pyrolysis treatment and washing treatment on the modified radix asparagi straws to prepare the modified radix asparagi straw biomass charcoal. The raw materials adopted by the invention are special, and the modifier can introduce nitrogen-containing and phosphorus-containing groups into the radix asparagi straws at the same time, thereby having important significance for increasing adsorption active sites of the biomass charcoal of the radix asparagi straws. The modified radix asparagi straw biomass charcoal is used for solidifying phosphate mineralizing bacteria to synergistically treat cadmium-polluted soil, so that the absorption of soil cadmium by rice can be effectively prevented and controlled, the quality and yield of rice grains can be improved, a multi-effect circulating mode of treating pollution by waste-biological synergy is formed, and the soil cadmium can be effectively prevented and controlled. The method has important theoretical value and practical application prospect for promoting agricultural green low-carbon development and pollution treatment.

The invention relates to the technical field of environmental protection, and discloses a method for jointly repairing cadmium-polluted soil by using oilseed rape and sulfur nanoparticles. Compared with a traditional remediation method, the sulfur nanoparticle-rape combined remediation method for farmland cadmium pollution, which is easy to popularize in a large area and is simple and efficient, is created by introducing the nanoparticles of the nutrient element sulfur necessary for plants, selecting cadmium accumulation type rape varieties mainly planted in the middle and lower reaches of the Yangtze River for matching and selecting a proper rape harvesting period. According to a specific oilseed rape seedling transplanting mode, sulfur nanoparticles with a certain concentration are applied, and the oilseed rape is harvested in time when the oilseed rape buds, so that the soil cadmium pollution remediation efficiency is greatly improved, the situation that cadmium absorbed by leaves on the overground part of the oilseed rape falls off due to natural maturity and is re-discharged into the soil environment is also remarkably reduced, and the secondary pollution of farmland is reduced. The remediation method can be applied to the technical field of environmental protection, is particularly applied to plant remediation of light and moderate cadmium contaminated soil in the middle and lower reaches of the Yangtze River, and is easy and convenient to operate and wide in application range.

The invention relates to the technical field of mutation breeding of rice, and particularly discloses a mutant OsNRAMP5 gene of a rice low-cadmium-accumulation mutant Cyclo < 2 > 820S-N5-24-1 and application of the mutant OsNRAMP5 gene. The nucleotide sequence of the mutant gene is as shown in SEQ ID NO. 1, and the coded amino acid sequence is as shown in SEQ ID NO. 2. Compared with the sequence of the OsNRAMP5 gene of Nipponbare rice, the sequence of the OsNRAMP5 gene has base A deletion at the 8875111 position of the No.7 chromosome. Rice containing the mutant gene is planted under the condition of severe cadmium pollution (the soil cadmium concentration is 2.32 mg / kg, and the pH value is 6.15), and grains of the rice have the characteristic of low cadmium accumulation which is lower than the national limit standard of 0.2 mg / kg. The invention provides a new mutant gene and germplasm for cultivating the low-cadmium-accumulation rice variety, accelerates the cultivation of the low-cadmium-accumulation rice variety, and has important significance for guaranteeing the national grain safety.

The invention relates to the technical field of soil environment monitoring and prediction, and particularly discloses a soil heavy metal cadmium runoff output flux prediction method based on small sample learning, which comprises the following steps: a data collection and preprocessing step: collecting small sample data related to soil heavy metal cadmium, comprising but not limited to soil cadmium content data, soil physicochemical property data, meteorological data, topographic data and runoff monitoring data; cleaning the collected data, removing abnormal values and missing values, and carrying out standardization processing on the data, so that different types of data have comparability; and constructing a small sample learning model: adopting a small sample learning model architecture fusing physical enhancement transfer learning and a self-attention mechanism. According to the soil heavy metal cadmium runoff output flux prediction method based on small sample learning, a good prediction effect can be achieved under limited sample data, and the problem that a traditional method is low in prediction precision under small sample data is solved.