关键词: 物元可拓法, 土壤重金属, 污染评价, 关联函数

Abstract: The soil heavy metal pollution has typical characteristics of fuzziness and uncertainty.In order to accurately evaluate the situation of soil heavy metal pollution，The matter-element extension model for evaluating soil heavy metal pollution was established based on theory of matter-element，extension theory and correlation function.Furthermore，pollutions from 46 sampling points in Goldfield were evaluated by choosing Cd，Pb，Cr，Hg，Cu and Zn as evaluation factors.The results showed that there were 23 sampling points at clean level among the 46 sampling points chosen from Goldfield，accounting for 50% of the total sample points，11 at light clean level，accounting for 23.9% of the total sampling points，and 11 at light pollution level and 1 at middle pollution level，accounting for 23.9% and 2.2% of the total sampling points respectively.Comparing with other four classical methods，it is concluded that using matter-element extension method to evaluate the situation of soil heavy metal pollution is feasible.It is simple and efficient to calculate the evaluation results with Matlab2010b.In addition，matter-element extension method avoided the influence of artificial factors in the process of evaluation and realized the quantitative processing with regard to these factors.Thus，it is a new and ideal method in evaluating heavy metal pollution of soil.

Key words: Matter-element extension, Soil heavy metal, Evaluation of pollution, Dependence function