浙江农业学报

• 环境科学 • 上一篇    下一篇

上海松江“浦南”地区设施菜地土壤重金属含量及其风险评价

  

  • 出版日期:2014-11-25 发布日期:2014-12-02
  • 通讯作者: (Shanghai Vocational College of Agriculture & Forestry, Shanghai 201600, China)

Heavy metal accumulation and its risk assessment in greenhouse soils in Punan, Shanghai

  1. (上海农林职业技术学院,上海 201600)
  • Online:2014-11-25 Published:2014-12-02

摘要: 选取上海市松江区“浦南”典型设施菜地为研究对象,研究土壤重金属含量,并采用单项污染指数及尼梅罗综合污染指数法来评价该地区设施菜地的土壤重金属污染风险。结果表明,研究区设施菜地耕层土壤中Cu,Pb,Cd,Cr,As五种重金属含量均出现不同程度的累积,除Cd含量超标外,其余4种重金属含量未超标;各重金属含量因种植年限不同而存在差异,在种植第3年出现峰值。较之露地种植,研究区设施菜地各剖面中Cu,Pb,Cd,Cr,As含量均较高,5种重金属中,除Cd外,其余4种重金属含量均随着剖面深度增加呈现下降趋势,主要富集在0~20 cm土层中,而Cd主要富集在40~60 cm土层中,因此应重视Cd在土壤剖面的富集及迁移。研究区设施菜地耕层土壤中Cu,Pb,Cd,Cr,As五种重金属含量单项指数Pi为Cd>Cu>Pb>Cr>As,Pb、Cr、As仍处于清洁水平,随着种植年限增加,Cu含量处于尚清洁水平,而研究区土壤已经受到Cd污染,并且随着种植年限增加,污染风险不断加大。

关键词: 设施菜地, 土壤重金属, 风险评价, 上海市

Abstract: In this study, the heavy metal contents in greenhouse soils in Punan were analyzed and the environmental risk was assessed via both single and comprehensive pollution index method. The results showed that Cu, Pb, Cd, Cr and As accumulated to different degrees. The contents of Cu, Pb, Cr, and As were below the limits of environmental quality standard except for Cd. The heavy metal contents all increased with the prolonging of planting years and reached peak values at the third planting year. Comparatively, the contents of investigated heavy metals in greenhouse soils were all higher than those in the open field. The contents of Cu, Pb, Cr, and As all decreased with the depth of soil profile. The single pollution indexes of heavy metals decreased in the order of Cd>Cu>Pb>Cr>As. For Pb, Cr and As, all samples were in the “clean” level. While for Cu, most were clean. But, Cd contamination was obvious and its environmental risk would increase with ages.

Key words: vegetable field, soil heavy metals, risk assessment;Shanghai City