川中丘陵区耕作土壤剖面重金属元素含量研究

The Research about the Content of Heavy Metal Elements in Soil Profile of the Hilly Region of Sichuang Central Section

以川中丘陵区内江市双桥乡为研究区域,调查分析耕作土壤剖面重金属(Cu、Pb、Zn、Cd、As、Hg、Ni)含量情况,并采用内梅罗综合污染指数方法对剖面土壤重金属污染状况进行评价.研究结果表明该地区Cd、Cr、Cu、Ni、Pb、Zn在研究区土壤剖面含量高于成都经济区土壤背景值,重金属含量具有从耕作层、犁底层、老耕层、古耕层垂直递减的规律;剖面土壤内梅罗综合污染指数平均值为1.26,重金属综合污染处于轻度状态;水田和旱地土壤剖面重金属含量存在明显差异,Cu、As、Hg、Pb在旱地耕作层含量明显高于水田.

This article according to the content of heavy metal elements in soil profile about the hilly region of Sichuang central section,and using the method of Nemerow complex index to analysis the pollution of heavy metal elements in soil profile.The result indicates that the content of Cu、Pb、Zn、Cd、As、Hg、Ni are higher than the background level of Chengdu.And the content of heavy metal elements in soil profile tends to decrease from the cultivated horizon to its underlying layer,whereas the content fails to show such a decreasing tendency.The Nemerow complex index of the soil profile is 1.26,the pollution of heavy metal elements in soil profile is mild.And the contents of heavy metal elements in soil profile are obvious differently in irrigated land and dry land,the contents of Cu、As、Hg、Pb in dry land are much higher than irrigated land.