深圳市农林土壤重金属累积现状及风险评价研究

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郑茂坤
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谢婧 已出版文章查询
谢婧
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王仰麟 已出版文章查询
王仰麟
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吴健生 已出版文章查询
吴健生
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李俊杰 已出版文章查询
李俊杰
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为探讨深圳市农林土壤重金属的污染现状,系统采集了深圳市菜地、果园、林地和荒地4种土地利用的52个土壤样品,测定了Cu、Pb、Cd、Zn、Cr、Ni6种重金属的全量,对深圳市农林土壤重金属20余年来的累积状况进行了分析并进行了初步的风险评价.结果发现,深圳农林土壤均存在不同程度的重金属累积,总体而言,Cu、Pb、Zn、Cr和Ni的累积较轻,Zn的最大含量尚未超过其80年代末背景值的最大值;Cd的累积最为严重,其最大含量已为背景最大值的16倍.以GB15618-1995为标准,对深圳农林土壤的重金属风险进行评价后发现,Cu的污染最轻,仅20%的菜地土壤超过国家一级标准,Pb50%超过国家一级标准,但尚未超过二级标准;Zn、Cr和Ni均有一定比例的样点超过二级标准,最少4%,最高50%,但未有超过三级标准的样点;Cd的风险最大,不仅有大量超过一、二级标准的样点,而且超过三级标准的样点也占有一定的比例(菜地、果园、林地和荒地土壤中Cd含量超过三级标准的比例分别为10%、23%、29%和50%).深圳农林土壤中的Cd污染应该引起相关部门的重视.

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语种: 中文   

基金国家自然科学基金项目(No.40635028)

关键词重金属 农业土壤 林业土壤 深圳市


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