平原区农田重金属污染的综合生态风险评价方法

由于生态风险评价指标选择存在差异，评价结果与实际污染事故之间的相关性较低，对此，提出一种平原区农田重金属污染的综合生态风险评价方法。基于生态风险管理框架，识别重金属污染源并确定评价终点，考虑到重金属污染特点，结合自然灾害指数、潜在生态损失度指数和污染指数，构建综合生态风险评价指标；在风险评价模型的作用下，获取不同重金属元素的风险值，并依据生态风险级别划分标准，完成平原区农田重金属污染的综合生态风险评价。应用结果表明，该方法的评价结果与重金属污染事故数之间的相关性为0.91，对控制土壤重金属污染及保护生态安全具有重要意义。

Methods for Assessment of Comprehensive Ecological Risk of Heavy Metal Pollution in Farmland of Plain Areas

Due to the differences of the selection of ecological risk assessment indicators, the correlation between the assessment results and the actual pollution accidents is low, therefore, a method for comprehensive ecological risk assessment of heavy metal pollution in farmland of plain areas is proposed. Based on the ecological risk management framework,heavy metal pollution sources was identified and the evaluation end point was determined. Considering the characteristics of heavy metal pollution, combined with natural disaster index, potential ecological loss index and pollution index, a comprehensive ecological risk evaluation index should be established; Under the function of risk assessment model, the risk values of different heavy metal elements were obtained, and the comprehensive ecological risk assessment of heavy metal pollution in farmland of the plain areas was completed according to the classification standard of ecological risk level. The application results showed that the correlation between the evaluation results and the number of heavy metal pollution accidents is 0.91, which is of great significance to control soil heavy metal pollution and protect ecological security.