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巢湖沉积物磷的形态及其与间隙水磷的关系

Keywords: 巢湖,沉积物,,形态分布,间隙水

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Abstract:

采用磷形态的连续提取法,研究了巢湖沉积物中磷的地球化学形态及间隙水中总溶解性磷(DTP)、可溶性磷酸盐(DIP)、可溶性有机磷(DOP)含量的垂向分布特征。结果表明,西湖区的沉积物总磷含量明显高于东湖区。表层沉积物中活性磷含量占总磷的44%~81%,金属氧化物结合态磷(NaOH-P)作为活性磷的主要存在形式,在西湖区含量比例达到47%~60%,对磷释放起重要贡献;磷形态剖面表明,西湖区的金属氧化物结合态磷、可还原态磷(BD-P)含量高于东湖区,金属氧化物结合态磷、可还原态磷、钙结合态磷(HCl-P)受人类活动影响较大,有机磷(Org-P)受外源磷污染影响很小;BD-P、NaOH-P随深度增加而减小,说明巢湖近期磷负荷有增加的趋势;DTP、DIP、DOP在水-沉积物界面的浓度梯度反映它们有自间隙水向上覆水扩散的趋势;巢湖间隙水不同形态磷与BD-P、NaOH-P显著相关(α=0.01)。这项研究可为巢湖内源污染和富营养化的控制与治理提供理论参考。

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