上海世博会规划区域城市土壤重金属调查及评价研究

An Investigation and Assessment on the Soil Heavy Metal in Shanghai EXPO Planning Area

2006年3月～2006年9月出于生态规划和构建世博区域生态要素数据库的目的,对上海2010世博会选址区域内表层土壤(0～15cm)中As、Cu、Ni、Pb、Zn等5种重金属元素的含量进行了方格式采样测定,并结合原土地利用类型、性质运用数理统计分析和GIS软件等对调查数据进行了分析。结果表明:世博会规划区内土壤中重金属含量,特别是Ni和Zn普遍较高。区域内重金属污染状况与原有土地利用类型和土壤类型密切相关;原工业用地内土壤的重金属含量高于原居住用地;同一土地利用区域内的不同表型(如裸地或绿地)的重金属含量则比较相似,其中裸地>绿化>拆迁地>码头。据此对不同类型的土壤分别提出了具有针对性的改良意见和植被配置建议。为将来世博区域土地资源的科学、合理和安全地利用提供科学的参考建议。

From Mar to Sep of 2006, we conducted a survey on measuring the concentration of heavy metals of the soil from Shanghai Expo area by GIS based grids sampling （200 × 200 m2） method. It is a partial work for our project of ecological planning and construction of the ecological elements database of the Shanghai expo area. After statistically analysis combined with GIS screening of regional land use history, the result showed that the contents of heavy metals （As, Cu, Ni, Pb and Zn） in samples, especially those of Ni and Zn, were at relatively high levels, and the distribution of heavy metal pollution was closely correlated with former land use history. The concentration of the heavy metal in the industrial zones were much higher than that in the residential zones, while in the same zone, a trend showed uncovered land 〉 green area 〉 housebreaking area 〉 dock area. Thus we mapped out the heavy metal level of investigated area and proposed some rearrangement and vegetation recovery measures for ecologically and safely use of the land in expo area.