徐州市北郊土壤重金属污染演化特征研究

对1991年和2003年徐州市北郊工业区土壤中重金属的含量作了对比分析，探讨了该区土壤重金属污染的演化特征。结果表明，12年来，该区土壤中重金属含量的水平分布，除了Cu污染有所减轻外，Cd、Pb、Zn、Cr污染都有不同程度加重，顺序是Cd＞Pb＞Zn＞Cr，而且Cd普遍超标；垂直分布上逐渐递减的规律已受到扰动，个别元素有淋溶沉积现象。

Evolutional Feature of Heavy Metals in Soils in Northern Suburban of Xuzhou

Through comparative analysis on heavy metal contents in soils taken from northern suburban industrial region of Xuzhou in 1991 and 2003, the evolutional features of the soil contamination by heavy metals were investigated. The results showed that in past twelve years, except Cu, the pollution degrees of Cd, Pb, Zn, Cr in horizontal distribution increased to some extent and the order was Cd>Pb>Zn>Cr, and Cd contents in most samples were higher than that of the standard II of official quality standard of soil environment. In vertical distribution, the law that heavy metal content decreased gradually from up to down has been disturbed and a few heavy metals have an image of eluviations aggregation.