农用地土壤重金属生态安全阈值确定方法的研究进展

农用地土壤重金属生态安全阈值作为农用地土壤环境质量基准制定的重要依据,近年来随着多学科的共同发展,农用地土壤重金属生态安全阈值的确定方法变得越来越完善,但目前对其的研究综述却鲜见报道。因此,文章综述了农用地土壤重金属生态安全阈值的确定方法,详细阐述了点模型、概率模型以及经验模型中的代表方法在确定农用地土壤重金属生态安全阈值方面的概念、原理、发展及应用,并深入探讨了各方法的适用情况和优缺点,系统分析了各方法在确定农用地土壤重金属生态安全阈值时的不确定性及影响因素,最后在前人的研究基础上提出了今后的主要发展方向,以期为我国农用地土壤环境质量标准的完善与细化及农用地土壤其他污染物生态安全阈值的确定提供参考依据。

Research Progress in Determination Methods of Ecological Safety Thresholds for Heavy Metals in Agricultural Land

In recent years, the methods for determining the ecological safety thresholds of heavy metals in agricultural land which are the important basis for the development of soil environmental quality benchmarks have become more and more mature. However, the research review is rarely reported currently. Therefore, the methods for determining the ecological safety threshold of heavy metals in agricultural land were summarized in this paper. Firstly, the concept, principle, and application of point model, probability model and empirical model are elaborated. And the advantages and disadvantages of each method were deeply discussed. Then, the uncertainty and the influencing factors of each method in determining the ecological safety threshold of heavy metals in agricultural land were systematically analyzed. Finally, the main development directions in the future were proposed, which would provide a reference for the determination of ecological safety thresholds of other soil pollutants and the improvement and refinement of soil environmental quality standards for agricultural land.