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抚仙湖水体N P变化及其非点源污染特征

Keywords: 抚仙湖,氮磷比,河道输入,非点源污染

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Abstract:

通过调查抚仙湖1981—2005年水体N、P变化,以及监测该流域33条主要入湖河道水体N、P的输入情况,从而揭示抚仙湖水体N、P变化规律及该流域非点源污染主要特征。结果表明,近20多年来,抚仙湖水体N素水平增长迅速而P素水平稳定,2001—2005年表层水体TN∶TP平均值达到33.06,P素成为抚仙湖水体藻类生长的主要限制因子之一。2005年,抚仙湖33条主要入湖河道TN和TP输入量分别为528.3t和70.7t,抚仙湖北部澄江县已成为非点源污染源最为严重区域,化肥的过量施用和畜禽养殖规模的过快发展已成为该流域非点源污染的主要原因。

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