[Longitudinal variation of heavy metals contents in topsoil covered with different vegetation in gully area].

This paper, taking the Mengjia River gully area of Junzilan Park in Changchun City of Jilin Province as an example, studied the longitudinal differentiation regularity of heavy metals in topsoil covered with different vegetation in gully area. The soil samples were collected from the gully slope, 2 m away from the gully bank, covered with arbor, shrub, vegetable and barren land along longitudinal profile in parallel with the flow direction, which was used to analyze the contents of Zn, Pb and Cu in the topsoil. The results indicate that the contents of these heavy metals have obvious difference. The content of Zn ranges from 70.3 mg x kg(-1) to 290.9 mg x kg(-1), the content of Pb from 39.8 mg x kg(-1) to 79.3 mg x kg(-1), and the content of Cu from 20.3 mg x kg(-1) to 63.4 mg x kg(-1). They all follow the declined order: barren, vegetable, arbor, and shrub. Moreover, the contents of these heavy metals were higher than their soil background values respectively. Thus, it can be assumed that they have accumulation tendency.