上海宝山区城市表土重金属累积的空间分布规律

Spatial Distribution of Heavy Metals in Urban Topsoil in Baoshan District,Shanghai

检测了上海宝山区127个表土样点的重金属含量。宝山区表土Zn、Cr、Cd、Pb、Cu、Ni、Mn的平均含量分别为228.6、127.6、0.56、118.5、55.2、55.7、718.7mg/kg。其中Pb、Zn、Cd的含量分别是上海土壤背景值的5.6、3.0、2.8倍,受污染较明显。宝山区地表的重金属含量呈现出明显的空间分布规律:工业区地表,如吴淞、大场等地,多种重金属污染均很重,Zn、Cr、Cd、Pb、Cu的平均含量分别高达407.6、319.0、0.75、101.2、76.2mg/kg;马路绿地土壤Pb的累积较显著,平均为180.2mg/kg;远郊菜地土壤重金属污染不明显。

Heavy metal contents in topsoils of 127 urban sites in Baoshan District, Shanghai were detected to study impact of urbanization on urban environment. Results indicated that the average value of Zn, Cr, Cd, Pb, Cu, Ni and Mn in the topsoils was 228.6, 127.6, 0.56, 118.5, 55.2, 55.7, and 718.7 mg/kg, respectively, among which, the value of Pb, Zn and Cd was 5.6, 3.0 and 2.8 times their respective background value in Shanghai. Spatial variation of heavy metal contents in the urban topsoil was also observed： Heavy metals in the topsoil of the industrial sites, such as Wusong and Dachang Towns etc., were the highest, with Zn, Cr, Cd, Pb and Cu being 407.6, 319.0, 0.75, 101.2, and 76.2 mg/kg on average, respectively; Pb was significantly accumulated in the topsoil of the Greenlands alongside highways, with the average being 180.2 mg/kg; but heavy metal contamination of the vegetable soils in the suburbs, such as Gucun, Luojing and Luodian Towns, was not significant.