南京城市土壤重金属含量及其影响因素

研究了南京城市土壤重金属含量、来源及其与土壤性质的关系。结果表明，南京城市土壤中，Fe、Ni、Co、V污染不明显，但受到了不同程度的Mn、Cr、Cu、Zn、Pb污染，其中：Pb污染非常严重；重金属在土壤剖面分布没有规律性；Fe、Ni、Co、V元素主要来源于原土壤物质，Cu、Zn、Pb、Cr元素主要来源于人为输入，Mn可能在不同的土壤中来源不同；Fe、Cr、Ni、Co、V元素含量之间均呈极显著正相关，Cu、Zn、Pb、Cr元素含量之间均呈极显著正相关。Fe、Co、V、Ni含量与粘粒含量、CEC呈极显著正相关；Cu、Zn、Pb含量与粘粒含量呈极显著负相关；Cu、Zn、Pb、Cr含量与有机碳呈极显著正相关，Pb含量与pH呈极显著正相关。

Heavy metal concentration in Nanjing urban soils and their affecting factors

The concentration and source of heavy metals in Nanjing urban soils and their relationships with soil properties were studied. The results indicated that the soils in Nanjing urban were not obviously polluted by Fe, Ni, Co and V, but polluted by Mn, Cr, Cu, Zn, and Pb to a certain extent. The heavy metals were irregularly distributed in soil profiles. Fe, Ni, Co, and V were originated from soil materials, but Cu, Zn, Pb, and Cr were anthropogenic input. Probably, Mn had different origins in different soils. There were positive correlations among Fe, Cr, Ni, Co, and V concentration, and among Cu, Zn, Pb, and Cr concentration. The Fe, Co, V, and Ni concentration were positively correlated with soil clay content and CEC, and the Cu, Zn and Pb concentration were negatively correlated with clay content. There were positive correlations between Cu, Zn, Pb and Cr concentration and organic C content, and between Pb concentration and soil pH.