Study On heavy metal behavior characteristics of soil in citrus orchar ds of the Three Gorges Reservoir Region

The heavy metal behavior characteristics of soil in citrus orchards in Fengjie County，Zhong County，Changshou Lake，Jiangjin City of the Three Gorges Reservoir Region were studied．The results show that the content of CA in 0～30cm soil is obviously more than that in 30～60cm so il．It proves that the soil has been polluted by CA ．The heavy metal of the citrus soil in the Three Go rges Reservoir Region comes from the rock．The total content of Cu，Cr，Zn，and As in the yellow soil is much more than that in the purple so il in the citrus orchard，while the available content of Zn，CA ，Cu，and Pbin the yellow soil is much smaller than that in the purple soil in the citrus orchards．The propo rtion of available content to total content of CA in the purple soil in the citrus orchards is 30.39％ ．while that in the yellow soil is 2.30％．