江苏沿海典型围垦区土壤重金属分布特征及来源分析

根据江苏沿海条子泥围垦区90个表层土壤重金属含量测试数据，分析其分布特征，应用地质累积指数法评价重金属污染现状，通过相关性分析和主成分分析研究重金属的来源。结果表明，重金属平均含量的大小顺序为Cr > Zn > Ni > Cu > Pb > As > Cd > Hg，高值区分布于梁垛河口，低值区分布于用作淡水养殖的滩涂；土壤环境质量优良，88个样品为一类土壤，重金属元素的平均地质累积指数小于0，污染程度为无污染；重金属元素主要来源于自然沉积，Cr、Cd、Pb还受到一定人类活动影响。

Distribution characteristics and source analysis of heavy metals in a typical reclamation area along Jiangsu coast,China

90 samples of surface soils from Tiaozini reclamation area along Jiangsu coast were tested for the contents of heavy metals.Based on the results, the distribution characteristics was analyzed, correlation analysis and principal component analysis were applied to estimate the sources of heavy metals.The contamination status of heavy metals was evaluated by using geoaccumulation index.The results showed that the order of average contents of heavy metals was Cr > Zn > Ni > Cu > Pb > As > Cd > Hg.The content was relatively higher in the Liangduo River estuary, and was relatively lower in tidal flat used for freshwater aquaculture.The quality of soils was generally good and in a non-polluted condition, because 88 samples were belong to the first grade soil and the average geoaccumulation index of heavy metals was less than zero.The heavy metals were mainly from natural source, and Cr, Cd, Pb were partly contaminated by human activities.