古运河营养元素分布特征及富营养化趋势分析

根据2005～2009年各季度对镇江古运河水体多项指标的监测资料,分析了古运河水体中N、P营养元素的时空分布特征,选用营养状态质量指数法对水体营养状态进行了评价,并预测了古运河水体的富营养化趋势。结果表明,古运河水体中营养元素随年度呈先增后减的特征,而年内季度分布不明显,空间分布基本呈从上游向下游递增的规律;2005～2009年,古运河水体连年处于富营养水平,2007年最为严重,但自2007年以来,水体营养水平逐年下降,水体富营养化趋势有所减缓。

The Distributive Characters of Nutrients and Analysis of the Eutrophication Trend in the Guyun River

On the base of the data observed in the Guyun River in Zhenjiang from 2005 to 2009,the distributive characters of N、P are analyzed.In the method of the nutrition condition performance figure,the eutrophication conditions in the Guyun River are assessed and the eutrophication trend is predicted.It is shown that concentrations of the nutritions in the Guyun River increased and then decreased by years,but the quarter distributions of the nutritions were unobvious;Spatially,they increased from the upstream to downstream;Water of the Guyun River was always in the eutrophic state during the five years,and it was the worst in 2007;But since then,the levels of nutrition declined year after year,and the eutrophication trend slowed down too.