中文摘要：

在百色城区及周边县城选择城市中心区、矿区和工业区采集土壤,分析其重金属元素（As、Cd、Cr、Cu、Mn、Ni、Pb和Zn）的含量及存在形态。结果表明,城市中心区土壤的重金属含量处于无污染水平,属于轻微生态危害程度;而工业区和矿区土壤的重金属含量超出百色土壤背景值,污染较严重,属于极强生态危害程度,其中Cd对土壤RI的贡献最大。不同功能区土壤重金属的分布形态特征既有相似性又有差异性。城市中心区、工业区与矿区土壤中,Cd的可交换态含量较高,占总量的18.2%~29.5%;Mn则主要以铁-锰氧化物结合态和残余态的形式存在;其余重金属元素（As、Cr、Cu、Ni、Pb、Zn）以残余态为主,占总量的70%以上。

英文摘要：

The content and speciation of heavy metal （As, Cd, Cr, Cu, Mn, Ni, Pb and Zn） in soils from different functional zones （mineral, industrial and urban central zone） of Baise city were investigated. The results indicated that heavy metal content in soil from urban central zone was at clean level, and the potential ecological risk was slight. However, heavy metal content in soils from mining and industrial zone exceeded the soil background of Baise and the soils have been polluted seriously. The assessment of potential ecological risk revealed that heavy metal in soils from mineral and industrial zones possessed very high potential ecological risk and the potential effect factor to ecological environment was Cd. There were similarity and dissimilarity in speciation of heavy metal in soils from different functional zones. The content of exchangeable Cd was relatively high, accounted for 18.2%-29.5% of the total concentration. Mn was present mainly in Fe-Mn oxides form and residual state. As, Cr, Cu, Ni, Pb and Zn in soil were present mainly in the residual state which accounted for more than 70% of the total concentration.