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广东大宝山地区重金属污染水田土壤的Cu Pb Zn Cd全量与DTPA浸提态含量的相互关系研究

Keywords: 重金属,污染,水稻土,DTPA,浸提率,大宝山

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Abstract:

通过现场采样及室内测试,分析了广东大宝山地区酸性金属矿长期污染水稻田的土壤特性,研究了重金属Cu、Pb、Zn、Cd的全量与DTPA浸提态含量的相互关系。结果表明,除Pb外,Cu、Zn和Cd的全量不同程度超标,而4种重金属的DTPA浸提态含量均较高,Pb和Cu的DTPA浸提率高于Zn和Cd。金属全量及其DTPA浸提量之间极显著相关。土壤酸性和有机质对金属Pb、Zn、Cd的DTPA浸出率表现出显著的促进作用,而与Cu的浸出率相关不显著。DTPA态金属可以作为测定该类水稻土壤金属有效态含量的简便指标。金属的全量、种类,土壤pH、有机质等属性,以及农业耕作等因素影响金属的DTPA态含量及有效性。

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