• 关键词：土壤  重金属污染  地积累指数  潜在生态危害指数  太原

• 基金项目：山西省自然科学基金项目(No.2010011044-2)

• 刘勇
• 山西大学黄土高原研究所,太原 030006

• 岳玲玲
• 山西大学管理学院,太原 030006

• 李晋昌
• 山西大学黄土高原研究所,太原 030006

• 摘要：为全面了解太原市土壤重金属含量及其潜在生态危害程度, 在研究区内共采集了80个土壤样品, 测试了Pb、Cu、Ni、As、Cd、Cr、Hg、Zn共8种重金属元素含量, 并采用地积累指数法和潜在生态危害指数法对土壤重金属污染进行了分析和评价.结果表明,太原市土壤环境总体污染程度处于无-中度污染,潜在生态危害处于轻微危害程度.相对而言, 各种重金属污染程度由强至弱依次为:Cd>Hg>Zn>Pb=Cu>Ni>As>Cr;各种重金属污染的潜在生态危害由强至弱依次为: Hg>Cd>As>Pb=Cu>Cr>Zn,其中,Hg的影响占绝对主导地位.总体而言,太原市城镇区域土壤重金属潜在生态危害最强,耕地区域次之.太原市土壤中8种重金属的超标部分主要来自城镇区域和耕地区域内的日常生活和生产活动,如交通运输、燃煤释放、农业施肥和污水灌溉等.

• Abstract：In order to determine the concentration of heavy metals in the soils of Taiyuan, China, and the associated potential ecological risk, 80 soil samples were obtained and analyzed for Pb, Cu, Ni, As, Cd, Cr, Hg and Zn. Two indices-the Index of Geoaccumulation and the Potential Ecological Risk Index-were used to evaluate the degree of pollution by heavy metals. The results indicated that the soils in study area are characterized by no-to-moderate pollution and pose a light potential ecological risk. The relative degree of pollution was in the order of Cd>Hg>Zn>Pb=Cu>Ni>As>Cr. Likewise, the potential ecological risk was characterized by the order of Hg>Cd>As>Pb=Cu>Cr>Zn, with the predominant risk factor being Hg. Comparatively speaking, the soils within the urban areas pose the greatest potential ecological risk, followed by those in rural areas. The excess of these eight elements in soils primarily results from transportation, coal combustion, fertilization, and irrigation with sewage.

• Key words：soil  heavy metals contamination  index of geoaccumulation  potential ecological risk index  Taiyuan

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