中文摘要：

选取某铀尾矿农田周边土壤为研究对象,通过对研究区的实地调查,以重金属元素含量实测值为基础数据分析了土壤重金属Pb、Cu、Zn、Cd的纵向分布特征,并应用单因子污染指数法、内梅罗综合污染指数法相结合对该区域的重金属污染状况进行了综合全面的评价分析。结果表明：Pb、Cu、Zn、Cd这四种重金属在农田土壤纵向分布上具有较好的规律性,其中Pb的含量大多呈现递减的趋势;Cu、Zn、Cd在大多数剖面的分布则呈现出先增加后减少的趋势。采样点中重金属含量异常分布可能与当地对农田土壤施加磷肥,靠近公路遭受汽车尾气排放、灌溉水渠等人为因素以及与尾矿库横向距离有关。以单因子污染指数法评价,该地区农田土壤未受Pb、Zn的污染;Cu、Cd污染属于轻度污染。内梅罗污染指数为3.09,说明综合污染等级为重度污染,且污染程度的强弱顺序为：Cu〉Cd〉Zn〉Pb。

英文摘要：

Selected the farmland surrounding soil of uranium tailings as the research object, through the field survey of the study area. The vertical distribution characteristics of heavy metals Zn , Cu , Cd and Pb were analyzed based on the measured value of heavy metal elements. The heavy metal pollution of this area was comprehensively analyzed and assessed by adop-ting the single factor pollution index , the Nemerow integrated pollution index method. Results show that the four heavy met-als of Pb , Cu , Cd and Zn have good regularity in the vertical distribution of farmland soil, most of the points in which the content of Pb show a decreasing trend , the distribution of Cu ,Zn and Cd in most sections show a trend of increasing first and then decreasing. Heavy metal content of abnormal distribution maybe relate to applied fertilizer P , near the road from auto-mobile exhaust emissions,irrigation canals and other man - made determinants, and horizontal distance of uranium tailings. With the single factor pollution index , the soil is not polluted by Zn and Pb in the area,Cu ,Cd pollution is mild pollution. The Nemerow integrated pollution index is 3.09, which shows that the comprehensive pollution level is heavy pollution , and the intensity of the degree of pollution order ： Cd 〉 Zn 〉 Cu 〉 Pb.