Spatial Distribution and Ecological Risk Assessment of Seven Elementsin Soil of Xianshanhu Wetland

Determinations on content of 7 element, namely Cu, Zn, Cr, Pb, Cd, As and Hg were implemented in the soils from different layers in 15sampling points around Xianshanhu Wetland of Changxing, Zhejiang province in April, 2014. Contamination of above-mentioned elements wasassessed by index of geoaccumulation and potential ecological risk index. The result demonstrated that contents of most tested elements at differentlayers in the soil around Xianshanhu were lower than national soil environmental standards, only Hg, Zn and Cd content was over-limit at some of thepoints. The content of Cu and Cd was higher in the soil of roadside, the content of Cu, Pb and Hg was higher in the downstream of the lake, while thecontent of Cd was lower. The content of tested elements had no obvious variation in the nursery and the marginal bank of the wetland. Most of testedelements had no obvious regularity in the vertical distribution of soil. Index of geoaccumulation showed that the soil was not polluted by theseelements. Potential ecological risk index showed that Hg had medium to high risk index at some points, which was need to be paid attention.