中文摘要：

为研究大荔县农田土壤重金属的累积与分布特征,评价土壤污染现状,运用了单因子污染指数及综合污染指数法,分析表层土壤5种重金属的污染现状,并利用ARCGIS9.3获取重金属污染空间分布图。结果表明：Cr、Cu的污染情况较严重,Pb、Zn、Mn的污染程度较低。从综合污染指数来看,研究区内农业土壤重金属综合污染指数处于中度污染水平。当地应采取适当措施,加强对该地区污染的防治工作,避免对人体健康造成危害。

英文摘要：

In order to study the soil distribution characteristics of heavy mental in Dali,the pollution status of the 5 kinds of heavy mental in surface soil was sampled and analzed,and the single factor pollution index and comprehensive pollution index were used to evaluate it,ARCGIS9.3 was used to analyze the spatial distribution of heavy metal pollution.The results show Cr and Cu pollution are serious,Pb,Zn and Mn are at lower levels of contamination.From the view of comprehensive pollution index,agricultural soil heavy metal pollutions show moderate level in research area.Thus,appropriate measures should be adopted to strengthen the prevention and control of pollution in the region and avoid the harm to human health.