土壤表层中的Cu、Cd、Pb的垂直运移规律

Vertical Transport Rules of Cu、Cd、Pb in the Surface of Soil

通过人工模拟重金属Cu、Cd、Pb污染土壤的试验，研究了不同浓度的重金属Cu、Cd、Pb在砂壤土、壤土和粘壤土3种不同质地土壤中垂直运移的规律。结果表明，重金属Cu2＋、Cd2＋、Pb2＋在土壤中垂直分布的规律随土壤质地不同而有所不同，其中土壤对重金属的吸附能力大小为粘壤土〉壤土〉砂壤土，重金属在土壤中的运移能力大小为砂壤土〉壤土〉粘壤土。Cu2＋、Cd2＋、Pb豺主要积累层在土壤表层，尤其是0～10cm的土层，随着土壤深度的增加，土壤Cu2＋、Cd2＋、Pb2＋含量逐渐减少。

The vertical movement patterns of heavy metals were investigated by simulating different concentrations of heavy metals Cu,Cd,Pb migration in the vertical direction of the different soil textures. The results showed that the vertical distribution of Cu, Cd, Pb in soil were varied with different soil textures. The soil adsorption abilities of heavy metals, in sequences,were clay loam, loam and sandy loam soil, while the migration capacity sequences were sandy loam soil,loam and clay loam. The contents of Cu, Cd,Pb were main accumulated at the surface layer, especially at the 0-10 cm soil, and the contents gradually reduced with the soil depth increasing.