以平凉市蔬菜产地为研究区域，于2004 — 2011年抽取土壤样品147点(次)，测定重金属As、 Hg、Pb、Cr、Cd的含量。以甘肃省主要农业土壤环境地球化学背景值为参考标准，应用地累积指数法划分出不同土类样点土壤重金属累积程度，结果只有1个样点的综合地累积指数达到1级，属轻度累积，其余146个样点综合地累积指数均小于零，属无累积状态，说明平凉市菜田土壤重金属累积总体上处于安全水平。对147个样点(次)土壤的5种重金属含量的相关性进行了分析，表明 Hg与其它元素之间无相关关系，与其它重金属不同源，累积过程和来源途径是单独和独立的；Cd与Cr也没有相关性，累积过程和来源途径不同源；其余重金属之间累积过程和来源途径存在高度的同源性。

In this study， the soil of vegetable origin as the study area in PingLiang city of Gansu . This paper collected soil sanples 147 times and determined the contention of heavy metals there are arsenic(As)， mercury(Hg)， lead(Pb)， chromium(Cr) and cadmium(Cd) from 2004 to 2011 . In this paper， the main agricultural soil environmental geochemical background values as the reference standard in province of Gansu . The accumulation degree of different soil heavy metal was divided by applied the cumulative index， the results showed that only 1 sample of geoaccumulation reached level 1， which belongs to the slight accumulation， the result of the 146 sampling points in comprehensive index of geoaccumlation is less than zero， which belongs to no cumulative state， this showed that the heavy metal accumulation of vegetable patch reached to security level in general in Pingliang . This paper analyzed the concentration of 5 kinds of heavy metals， about the 147 samples in soil， this indicats that there is no correlation between mercary and other elements， and there is no homology with other metals， the process of accumulation and sources was separetly and independently； this also indicates that cadmium and chromium no correlation， cumulative process and sources were not homologous； and the accumulation process and origin have highly homologous between the other heavy metals .

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