中文摘要：

为阐明万山汞矿区自然土壤汞的污染情况,以汞矿开采冶炼区为起点,沿敖寨河和下溪河等间距（4 km）分层采集0~30 cm厚度的河滩土、灌木土和林地土,测定了其汞含量,分析了自然土壤汞的空间分布特征。结果表明,矿区同种植被覆盖类型的土壤总汞的含量变化范围较大,河滩土为0.16~389 mg.kg-1、灌木土为0.09~312 mg.kg-1、林地土为0.05~299 mg.kg-1,空间分布特征表现为随距污染源距离的增加而降低;同一采样区内河滩土、灌木土、林地土中土壤总汞的含量依次降低,同一采样点的垂向剖面上总汞含量一般从表层向下依次降低。

英文摘要：

To clarify the distribution of mercury pollution in the natural soil in Wanshan mercury（Hg） mining area,total mercury（THg） concentrations were measured in 0-30 cm soil layers of alluvial soil,shrub soil and forest soil along the Aozhai river and Xiaxi river with a interval of 4 km.THg concentrations in the same vegetation cover area varied in a wide range（alluvial soil was 0.16-389 mg·kg-1,shrub soil was 0.09-312 mg·kg-1 and forest soil was 0.05-299 mg·kg-1）,and spatial distribution of THg indicated that THg in natural soil decreased with increasing distance from the Hg mining area.Moreover,THg concentrations decreased from alluvial soil,shrub soil to forest soil in a sample site,and they decreased with increasing depth in soil profiles.