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湖泊科学  2014 

水位波动对长江中下游湖泊湖滨带底质环境的影响

DOI: 10.18307/2014.0302

Keywords: 水位波动,湖滨带,底质,长江中下游

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Abstract:

以长江中下游湖泊为对象,研究了水位波动对湖滨带底质环境的影响.结果表明,底质环境参数沿高程梯度变化明显.底质含水率沿高程梯度增加而减小,pH值沿高程梯度变化不大,有机质、总氮和总磷沿高程梯度呈先增大后减小的趋势.底质环境参数的季节变化也较大.分析表明,水位波动幅度、淹没深度、高水位持续时间等对湖滨带底质环境有较大影响.在中等波动幅度下,底质参数沿高程的变异系数最大,表明此时湖滨带底质异质性较高.夏季湖滨带淹没时间越长、淹没深度越大,底质养分流失越快.高水位持续时间越长,底质pH值变化就越大、营养盐流失越快.本研究结果可为湖滨带生态修复及管理提供依据.

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