Cultivated land ecological risk evaluation method based on mean square error weighting method

Abstract

The invention discloses a cultivated land ecological risk evaluation method based on a mean square error weighting method. The method comprises: S1, determining a cultivated land ecological risk source of cultivated land to be subjected to risk evaluation and corresponding evaluation indexes; S2, calculating the weight of each evaluation index by adopting a mean square error weighting method; S3,multiplying the data of each evaluation index in the same year by the corresponding weight to obtain a comprehensive risk index; and S4, according to the comprehensive risk indexes, carrying out function grade division on the ecological risks of the cultivated land to be subjected to risk assessment, and according to a division result, making an ecological risk assessment comprehensive index distribution diagram of the cultivated land to be subjected to risk assessment. The method realizes comprehensive evaluation of various evaluation factors, and has the characteristics of comprehensive andscientific evaluation of the ecological risk of the cultivated land, wide application range and the like. The evaluation method can be applied to planning of land utilization planning, basic farmlandprotection, agricultural industry layout adjustment, biodiversity protection and the like.

Description

technical field [0001] The invention relates to the technical field of ecological risk assessment, in particular to a method for evaluating the ecological risk of cultivated land based on the mean square error weighting method, which belongs to the category of ecological risk assessment. Background technique [0002] Ecological risk assessment is an important means of ecological environment management, and its related research and technical application have developed rapidly in the past ten years, and it is the basis of ecological security research. Preventing and resolving the ecological risks of cultivated land is essentially to understand, analyze and solve the ecological problems of cultivated land. In view of the importance of cultivated land resources and the objective existence of cultivated land ecological risk, in order to ensure the sustainable use of cultivated land resources and prevent the occurrence of risks, it is urgent to conduct a comprehensive study on the...

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Problems solved by technology

[0005] ③ From the perspective of evaluation framework, the relevant ecological risk evaluation framework at home and abroad has not yet been unified

[0007] To sum up, domestic and foreign studies on cultivated land ecological risk assessment are still in the stage of theoretical exploration. Although there are various assessment models, methods and index systems, there are still some deficiencies: First, in terms of research perspective, most domestic and foreign studies Focus on human health risks caused by toxic and hazardous substances

There is a lack of quantitative and in-depth analysis and research on the risks of ecosystems dominated by human activities; second, in terms of evaluation index systems, although regional ecological risk evaluations have been carried out in China, there are many types of evaluation indicators and there is a lack of A unified indicator system and various necessary risk standards that can be widely accepted; thirdly, due to the limitations of the knowledge ability of researchers, the reliability and availability of research data, whether the selected models and methods can objectively reflect the The actual situation and other influences make the risk assessment results full of uncertainties

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