CN-122024921-A - Sensitive species screening method and system for deriving soil Cd environmental quality standard

CN122024921ACN 122024921 ACN122024921 ACN 122024921ACN-122024921-A

Abstract

The invention relates to the field of environmental science, and provides a sensitive species screening method and a system for deriving environmental quality standard of soil Cd. The method comprises the steps of establishing a multidimensional evaluation index system, carrying out weighted scoring treatment on candidate species, screening to obtain a primary receptor species list, obtaining soil Cd toxicity data aiming at the species in the primary receptor species list, carrying out soil property normalization treatment on the soil Cd toxicity data to obtain a standardized toxicity data set, inputting the standardized toxicity data set into a species sensitivity distribution model for fitting calculation to generate a species sensitivity distribution curve, sorting the species according to sensitivity according to the species sensitivity distribution curve, and selecting sensitive species from sorting results to form a sensitive ecological receptor list. The method improves the scientificity, accuracy and regional applicability of the derivation of the Cd environmental reference of the soil.

Inventors

CHEN SHIBAO
WANG MENG
YU LEI

Assignees

中国农业科学院农业资源与农业区划研究所

Dates

Publication Date: 20260512
Application Date: 20260114

Claims (10)

1. The sensitive species screening method for deriving the environmental quality standard of the soil Cd is characterized by comprising the following steps: S1, establishing a multidimensional evaluation index system, carrying out weighted scoring treatment on candidate species, and screening to obtain a primary acceptor species directory; s2, aiming at the species in the primary receptor species list, acquiring soil Cd toxicity data, and carrying out soil property normalization treatment on the soil Cd toxicity data to obtain a standardized toxicity data set; S3, inputting the standardized toxicity data set into a species sensitivity distribution model for fitting calculation to generate a species sensitivity distribution curve; S4, sorting the species according to the sensitivity according to the species sensitivity distribution curve, and selecting the sensitive species from the sorting result to form a sensitive ecological receptor directory.
2. The method for screening sensitive species for deriving environmental quality benchmarks for soil Cd according to claim 1, wherein step S1 further comprises: S11, determining a target ecosystem type, and extracting candidate species related to the target ecosystem type from a local species database; s12, establishing a multi-dimensional evaluation index system, and calculating a multi-index score for each candidate species; s13, carrying out weighted summation calculation according to the preset weight value of the multi-index score to obtain the comprehensive score of each candidate species; S14, sorting according to the comprehensive scores from high to low, and selecting candidate species with a preset ranking range to form a primary acceptor species directory.
3. The method according to claim 2, wherein the multidimensional evaluation index system in step S12 includes an ecological correlation index, a nutrition layering index, a laboratory culturability index, and an economic protection value index.
4. The method for screening sensitive species for deriving environmental quality benchmarks for soil Cd according to claim 1, wherein step S2 further comprises: s21, collecting Cd toxicity data of a plurality of species in the primary receptor species list by searching a public database to obtain original toxicity data; S22, quality screening is carried out on the original toxicity data according to a preset quality standard to obtain qualified toxicity data; S23, identifying the species lacking qualified toxicity data in the primary receptor species list, carrying out Cd toxicity experiments according to a standardized test method, and determining to obtain experimental toxicity data; s24, integrating the qualified literature toxicity data and the experimental toxicity data to construct an integrated toxicity data set; S25, extracting soil property parameters corresponding to a plurality of toxicity data in the integrated toxicity data set, carrying out normalized conversion on toxicity values in the integrated toxicity data set through a biological effectiveness correction model, and uniformly converting the toxicity values under different soil conditions into equivalent toxicity values under standard reference soil conditions to form a standardized toxicity data set.
5. The method for screening sensitive species for deriving environmental quality standard of Cd in soil according to claim 4, wherein in step S22, said quality standard comprises rational control group of test setting, definite exposure route, complete soil property parameter, sufficient test repetition number, sufficient test concentration gradient, and presence of complex pollution interference.
6. The method according to claim 4, wherein in step S23, the standardized test method is in compliance with OECD or ISO standard test specifications, and the test end points of the Cd toxicity test performed according to the standardized test method include acute mortality, proliferation inhibition, growth inhibition, germination inhibition.
7. The method according to claim 4, wherein in step S25, the soil property parameters include pH, organic matter content and cation exchange capacity, and the bioavailability correction model is a linear regression model or a species sensitivity distribution extrapolation method.
8. The method for screening sensitive species for deriving environmental quality benchmarks for soil Cd according to claim 1, wherein step S3 further comprises: S31, selecting a probability distribution model, wherein the probability distribution model comprises a Burr-TypeIII distribution model and a Log-Normal distribution model; S32, inputting equivalent toxicity values of a plurality of species in the standardized toxicity data set as a model, and carrying out parameter estimation and fitting optimization through the probability distribution model to generate an initial sensitivity distribution curve; s33, performing goodness-of-fit test on the initial sensitivity distribution curve to obtain a species sensitivity distribution curve.
9. The method for screening sensitive species for deriving environmental quality benchmarks for soil Cd according to claim 1, wherein step S4 further comprises: S41, calculating cumulative distribution probability values of a plurality of species on a curve based on the species sensitivity distribution curve; S42, sorting the species according to the accumulated distribution probability value from high sensitivity to low, and mainly marking high-sensitivity species adjacent to a HC 5 protection threshold value to obtain a sorting result; S43, selecting species within a preset sensitivity range from the sorting result to obtain screening species; s44, carrying out nutrition level coverage inspection on the screening species, confirming that the screening species covers at least three nutrition levels of a producer, a primary consumer, a secondary consumer and a decomposer, and if the nutrition level coverage is insufficient, supplementing and selecting sensitive species in the corresponding nutrition levels to form the final sensitive ecological receptor directory.
10. A sensitive species screening system for deriving a soil Cd environmental quality benchmark, comprising: The weighting module is used for establishing a multidimensional evaluation index system, carrying out weighted scoring treatment on candidate species, and screening to obtain a primary acceptor species directory; the acquisition module is used for acquiring the toxicity data of the soil Cd aiming at the species in the primary receptor species list, and carrying out the soil property normalization processing on the toxicity data of the soil Cd to obtain a standardized toxicity data set; the fitting module is used for inputting the standardized toxicity data set into a species sensitivity distribution model for fitting calculation to generate a species sensitivity distribution curve; and the output module is used for sequencing the species according to the sensitivity according to the species sensitivity distribution curve, and selecting the sensitive species from the sequencing result to form a sensitive ecological receptor directory.

Description

Sensitive species screening method and system for deriving soil Cd environmental quality standard Technical Field The invention relates to the technical field of environmental science, in particular to a sensitive species screening method and a system for deriving environmental quality standard of soil Cd. Background Soil cadmium pollution has become a prominent environmental problem threatening the safety of ecosystems and the quality safety of agricultural products due to its high toxicity, easy migration and accumulation through food chains. And a scientific and reasonable soil Cd environmental quality standard is formulated, so that the method is a precondition for effectively implementing soil pollution risk management, control and repair. The derivation of soil environmental benchmarks and their scientificity is highly dependent on the representativeness of the sensitive ecological receptors chosen, i.e., whether these species can truly reflect the adverse effects of Cd pollution on the structure and function of the local ecosystem. Species sensitivity distribution model (SSD) is used as a core tool for deriving environmental references, and an accumulated probability distribution curve is constructed by integrating toxicity data of a plurality of species, so that environmental quality reference values for protecting a certain proportion of the species are derived. However, the existing screening method for sensitive species in the derivation of the environmental quality standard of soil Cd has significant defects. On the one hand, the existing researches directly adopt standard test species recommended by a standardization organization, and the species are convenient for laboratory standardization test, but the distribution, the abundance and the ecological function in a local ecological system are often limited, so that the standard deduction ignores key local species which are more sensitive to Cd, and the problem of poor regional adaptability is caused. On the other hand, the species screening process depends on experience judgment or data availability, and a quantitative multidimensional comprehensive evaluation system based on an ecology principle is lacking, so that the selected species often have the problems of insufficient nutrition level coverage, missing key ecological functional groups and the like, and the structure and the functional integrity of an ecological system are difficult to comprehensively represent. In addition, due to the fact that the toxicity threshold value of Cd to the same species can be different by more than one order of magnitude in the soil of different areas due to the difference of soil properties, toxicity data obtained based on different soil conditions are directly cited without standardized treatment, the toxicity data are inevitably lack of comparability, and finally the deduced environmental benchmark scientificity and accuracy are seriously insufficient. Therefore, a set of system, objective and data-driven sensitive ecological receptor screening technology system is needed to be established in the field, and the technical problems of insufficient species screening system, incomparable toxicity data and poor regional adaptability in the existing method are solved. Disclosure of Invention The invention provides a sensitive species screening method and a system for deriving a soil Cd environmental quality standard, which are used for solving the defects of the prior art. The invention provides a sensitive species screening method for deriving the environmental quality standard of soil Cd, which comprises the following steps: S1, establishing a multidimensional evaluation index system, carrying out weighted scoring treatment on candidate species, and screening to obtain a primary acceptor species directory; s2, aiming at the species in the primary receptor species list, acquiring soil Cd toxicity data, and carrying out soil property normalization treatment on the soil Cd toxicity data to obtain a standardized toxicity data set; S3, inputting the standardized toxicity data set into a species sensitivity distribution model for fitting calculation to generate a species sensitivity distribution curve; S4, sorting the species according to the sensitivity according to the species sensitivity distribution curve, and selecting the sensitive species from the sorting result to form a sensitive ecological receptor directory. According to the sensitive species screening method for deriving the environmental quality standard of the soil Cd, the step S1 further comprises the following steps: S11, determining a target ecosystem type, and extracting candidate species related to the target ecosystem type from a local species database; s12, establishing a multi-dimensional evaluation index system, and calculating a multi-index score for each candidate species; s13, carrying out weighted summation calculation according to the preset weight value of the multi-index score to obtai