贵阳市鱼腥草种植区土壤重金属含量的研究及污染评价

以我国土壤质量环境标准为背景值,选取、分析贵阳市金阳、乌当等地鱼腥草种植区土壤中的Pb、Cd、Hg、As Cu、Zn的含量特征,并进行土壤重金属污染评价和潜在生态风险评价。结果显示:采样点内以Zn的平均含量最高(120.96mg·kg-1),Hg的平均含量最低(0.23mg·kg-1);Zn与Hg之间存在较高的相关性,说明Zn与Hg来源相同的可能性较大;单因子指数、内梅罗综合污染指数法与Hakason潜在生态危害指数的对土壤的污染评价略有差别,其中,南明区的污染级别为轻污染,内梅罗污染指数为1.08,白云区为中度生态危害程度,土壤重金属的潜在生态危害指数(RI)为113.65,产生最大生态危害的是Hg。

Heavy metal concentration and pollution assessment of different Houttuynia planting areas in Guiyang city

The concentration of heavy metals Pb, Cd, Hg, As, Cu, Zn were measured in different Hout- tuynia planting areas in Guiyang, and assessment of heavy metal pollution was conducted by comparisons of our results with the background values of soil environmental quality standards in China. The results showed that the content of Zn （120.96mg · kg-1） is highest, the content of Hg （0.23mg · kg-1） is lowest. Higher correlation analyses showed that Zn and Hg may came from the same recourses. Both comprehensive pollu- tion index and ecological risk index had a little different to evaluate the pollution of soil. Comprehensive pollution index indicated the Nanming district were a little polluted by heavy metals. Ecological risk index showed that Hg had the highest potential to cause ecological damage in Baiyun area.