中文摘要：

以金昌市郊农田表层土壤（0～20cm）为研究对象，研究了土壤中重金属Zn、Ni、Pb、Cu、Cd的含量情况及可能来源，并对土壤中重金属污染进行了潜在生态风险评估。结果表明，金昌市郊农田土壤重金属的累积现象比较明显，尤其是Cu、Ni，二者的几何平均值均超过了国家土壤环境质量二级标准（GB15618-1995）。相关性分析表明Cu与Ni，Pb与Cd之间分别呈显著正相关；Pb与Ni、Cu之间则呈显著负相关。因子分析显示，研究区土壤中的Cu和Ni主要来源于工矿业活动；农业生产活动则对Zn、Cd、Pb的贡献最大。潜在生态风险评估的结果为Ph、Zn这两种元素的潜在生态风险均处于低危害水平，Cd、Cu、Ni则均存在不同程度的潜在生态风险，具体的潜在生态风险排序为Cd〉Cu〉Ni〉Pb〉Zn。

英文摘要：

The contents of toxic metal Zn, Ni, Pb, Cu, and Cd were investigated by sampling the topsoil（0-20 era） from suburb croplands in Jinchang city, and the possible origination of pollutants speculated. The resutts indicated that the metals studied had obvious accumulation in suburb cropland. The geometric mean concentrations of Cu and Ni were higher than the critical value of second grade in national soil environmental quality standards, but the levels of others lower than the standards（GB15618--1995 ）. The eorrelation analysis indicated that there were markedly significant positive correlations between Cu and Ni, and between Pb and Cd. As for Pb and Ni, there existed nicely significant negative correlations, and the same with Pb and Cu. The results from factor analysis suggested that Cu and Ni in the soils studied were mainly originated from industrial and mining activities ; and agricultural activities had the largest impact on the accumulation of Zn, Cd, and Ph. The potential ecological risk assessment showed that the risks of Pb and Zn were on a low level, but Cd, Cu, and Ni existed different degrees of risk. The order of potential ecologieal risk was Cd〉Cu〉Ni〉Pb〉Zn.