中文摘要：

对贵州省赫章县新官寨土法炼锌点的土壤重金属含量及空间分布进行了研究,以了解土法炼锌活动停止以后土壤重金属的污染状况。结果表明,当地农业土壤重金属的平均含量分别为Pb 337、Zn 648、Cd 9.0、Hg 0.44、Cu 121和As 17 mg.kg-1,分别是贵州省农业土壤背景值的7.5、7.9、26.4、2.2、4.7和0.8倍。单项污染指数显示,土壤Cd的污染最重,依次为Zn、Pb、As、Hg和Cu。综合污染指数揭示,该土法炼锌点4 km范围内的表层农业土壤严重污染。土壤中的污染物主要累积于表层30 cm内,30 cm以下浓度较低。土壤Zn和Cd具有较高的活性和迁移性,峰值已向下迁移15~20 cm。

英文摘要：

An investigation was made on the farmland soil heavy metals concentration and their spatial distribution in a former artisanal zinc-smelting zone of Xinguanzhai,Hezhang County,Guizhou Province,aimed to assess the soil heavy metals contamination after the ceasing of artisanal zinc-smelting activities.The average concentrations of Pb,Zn,Cd,Hg,Cu,and As in surface soil were 337,648,9.0,0.44,121,and 17 mg·kg-1,being 7.5,7.9,26.4,2.2,4.7 and 0.8 times as higher as the background values of Guizhou farmland soils,respectively.The single factor pollution index revealed that Cd was the most serious contaminant,followed by Zn,Pb,As,Hg,and Cu.The integral pollution index indicated that within the range of 4 km in the zone,surface soil underwent serious heavy metals combined contamination.Most of the heavy metals accumulated in upper 30 cm soil layer and reduced with soil depth,while Zn and Cd moved downward 15-20 cm due to their higher activity and mobility.