[Concentrations of soil heavy metals and their spatial distribution in the surrounding area of Fenhe Reservoir].

Based on the concentrations of heavy metals from 95 topsoil samples, the spatial distribution characteristics and sources of the heavy metals in soil of the surrounding area of Fenhe Reservoir were analyzed with a method combining multivariate statistics and geo-statistics. The results showed that the average concentrations of the Cr, Cu, Ni, Pb, and Zn in soil of study area were 38.45, 19.09, 24.02, 11.98 and 55.01 mg x kg(-1), respectively, and all were lower than the first class standard of the national soil environment and the background values of soil in Shanxi Province. For all heavy metals, there were some samples with concentrations higher than the background values of soil in Shanxi Province, especially for Pb, Cr, and Cu, exceeding by 28%, 14%, and 13%, respectively. The results of correlation analysis and factor analysis showed that the sources of the excess of these heavy metals could be divided into three categories, Cu, Ni and Zn as one class, Cr and Pb as the other two classes. Spatial structure analysis showed the excess of Cu, Ni, and Zn came mainly from daily life and production activities, and the excess of Cr and Pb came mainly from agricultural activities and transportation.