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滇池沉积物磷的释放以及不同形态磷的贡献

Keywords: 滇池,,释放,环境因子,形态

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Abstract:

在实验室控制条件下,以滇池表层新鲜沉积物为材料,研究了水体溶解氧、pH值对沉积物磷释放的影响以及沉积物不同形态磷对释放的贡献。结果表明,随着水体pH值的升高,沉积物的释磷量明显增加,湖水碱性条件下的释放量是中性条件的几百倍。与好氧条件相比,厌氧状态促进沉积物中磷的释放。可还原态磷是厌氧条件下磷释放的主要形态,碱性条件下金属氧化物结合态磷对沉积物磷释放的贡献很大。滇池北部沉积物磷以金属氧化物结合态磷、有机磷形式为主,钙结合态磷次之,可还原态和弱吸附态磷含量很少。不同形态磷在沉积物剖面总的变化规律为表层含量大于底层。

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