三峡库区蓄水后支流回水段富营养化研究

Study on the Eutrophication in Backwater Area of Branches after the Storage of Three Gorges Reservoir

2004年4月期间分别对大宁河、神女溪、抱龙河与大溪河回水段水体进行了富营养化调查和监测，并运用综合营养状态指数法对监测结果进行了评价与相关性分析，初步研究了支流回水段水体的水质状况。结果表明库区支流回水段的营养盐浓度并不比长江干流高，但库区支流回水段的中下游区域已经发生了轻度富营养化；相关公式的建立有助于掌握支流回水段的水质状况；叶绿素a与氮磷等营养盐呈现较好的正相关关系，与透明度和电导率则呈较显著的负相关关系。

Eutrophication investigation and monitoring of Daning river, Shennv river, Baolong river and Dasxi river were processed in May 2004. The water quality of branches＇s backwater area was analyzed based on the monitoring results. The concentration of nutrition in backwater area is not higher than that in Yangze river. Light eutropher has happened in the middle and down stream of branches. Correlativity formulas help to understand the water quality of backwater area. The correlativity between chlorophyll - a and nitrogen and phosphorus is positive, and the correlativity is negative between chlorophyll- a and transparency and electric conductivity.