基于GIS的南京市典型蔬菜基地土壤重金属污染现状与评价.pdf

24 2 Vol. 24 No. 2 20084 Environmental Monitoring in China Apr. 2008 GIS 陈 峰, 尹春芹, 蒋 新, 张海秀, 汪福旺 ( , 210008) : 对南京市八卦洲蔬菜基地土壤中的铅铬铜 镉进行测定分析, 利用不同的评价标准来评价其环境质量状况, 同时借助GIS 软件研究了污染指数的空间分布状况, 并解析了其重金属污染的来源结果表明, 以自然背景值为评价标 准, 则蔬菜地土壤中的重金属都超过污染指标, 其中镉为首要污染因子; 以国标二级为评价标准, 则除镉以外的三种重 金属的单项污染指数值全都小于1, 但其综合污染指数达 150, 总体上属轻污染状况南京化工园区南京长江二桥 各种农业生产活动等可能是主要污染源 : 蔬菜地土壤; 重金属污染; 污染指数; 评价 : X825 :A : 2008) Evaluation of Heavy Metal Pollution inRepresentative Vegetable Soils in Nanjing Based on GIS CHEN Feng, et al ( State Key La oratory of Soil and Sustaina le Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China) Abstract:The contents of heavy metals ( P , Cr, Cu and Cd) in vegeta le soils in Baguazhou Town, Nanjing were investigated to evaluate soil environmental pollution of heavy metals y using different evaluation standards of heavy metal pollution for comparison, furthermore, the spatial distri ution of pollution index was analyzed with the aid of geographical information system ( GIS) technology and potential sources of heavy metal pollutants in vegeta le soils were also elucidated. The results showed that the soils were polluted with heavy metals P , Cr, Cu and Cd according to natural ackground values as evaluation standard, While using National Standard ( GB 15618- 1995) as evaluation standard, soils were not polluted with heavy metals P , Cr, Cu except Cd. However, integrated pollution index of soil heavy metals is 15 so that the whole studied soils show a slight pollution. It was preliminarily concluded that the chemical industrial areas of Nanjing, the Second Nanjing Changjiang Bridge and agricultural actions may e the major causes leading to soil heavy metal pollution. ey words: Vegeta le soil; Heavy metal pollution; Pollution index; Evaluation , ,