上海市区公园土壤重金属含量及其污染评价

Heavy Metal Concentrations of Soils in Shanghai Urban Parks and Their Assessment

通过对上海市区44个公园土壤重金属含量的调查,发现市区公园表层土壤Pb、Zn、Cu和Cr的平均含量分别为55.1mg kg-1,198.5 mg kg-1、44.6 mg kg-1、77.0 mg kg-1。以上海土壤背景值为标准,用内梅罗指数法综合评价上海市区公园土壤重金属污染状况为:绝大部分公园为轻污染,9个为中度污染,7个达重度污染。通过对公园土壤重金属含量的空间分析发现:内环线附近公园土壤Pb、Zn和Cu的平均含量最高,Cr的平均含量以内外环线之间公园为最高。上海市区公园较严重的重金属污染可能来源于交通和工业污染,与公园建成时间无显著性相关。

Heavy metal concentrations of surface soils taken from 44 parks in Shanghai urban area were studied. The results showed that the average concentrations of Pb, Zn, Cu and Cr were 55.1 mg kg^-1,198.5 mg kg^-1, 44.6 mg kg^-1 and 77.0 mg kg^-1. Based on the criteria of background concentrations, more than a half of the parks were lightly polluted, 9 parks were medium -polluted and 7 parks were polluted seriously on Nemerow N L polluted indexes. The spatial distribution of the heavy metals were as follows ： the average concentrations of Pb, Zn and Cu were in tiptop in the parks beside the inner ring, and the highest average concentration of Cr was located between the outer ring and the inner ring. The heavy metals in the seriously pollated soil of the parks might may come from the traffic and industry, and they were not correlated to the time of setting up the parks significantly.