上海市宝山区城镇化对农业用地环境质量的影响

Impact of Urbanization on Farmland Environmental Quality in Baoshan District,Shanghai

利用环境风险指数法,对上海宝山区2003和2007年城镇农业土壤重金属Cd、Cr、Cu、Pb和Zn环境风险进行评价;从人口、经济、社会生活和生态环境4方面构建城镇化水平综合评价指标体系,并对宝山区2003和2007年城镇化水平进行综合测度,探讨宝山区城镇化水平与农业土壤环境风险指数间的定量关系。结果表明,与2003年相比,2007年宝山区农业土壤重金属Cr、Cu、Pb和Zn含量增加明显,农业土壤重金属综合环境风险加剧,环境风险在空间上表现为由东南向西北方向扩展态势;城镇化水平提升明显,城镇化水平与环境风险指数间存在明显正相关关系;目前宝山区城镇化发展模式不利于农业环境质量保护。

The environmental risk index（IER） method was utilized to evaluate heavy metal（Cd,Cr,Cu,Pb,and Zn） environmental risk in farmland soil of Baoshan District,Shanghai.An integrated evaluation indicator system for urbanization was founded combining 4 major factors,such as population,economy,social life,and ecological environment,and used to measure urbanization of the district in 2003 and 2007 for exploration of quantitative relationship between urbanization and farmland soil environmental risk.Results show that compared with the soil in 2003,the farmland soil in Baoshan in 2007 was obviously higher in heavy metal（Cr,Cu,Pb and Zn） concentration,which intensified the farmland soil heavy metal environmental risk.Spatially,the environmental risk expanded from southeast towards northwest.Its urbanization level increased significantly and an obvious positive correlation existed between the urbanization and the environmental risk index.The current urbanization development mode in Baoshan seems unfit to protection of its agricultural environmental quality.