泥沙沉降对长江水体富营养化相关因素的影响初探

针对三峡库区重庆段蓄水后,泥沙沉降对长江水体富营养化相关因素的影响进行了研究。三峡库区含沙量大,泥沙对水环境的影响不容忽视。为准确预测成库后三峡库区重庆段富营养化的发生,文章通过泥沙沉降对水质影响静态模拟试验,研究了长江原水的泥沙沉降对水体中叶绿素a、透明度、溶解性总磷、溶解性总氮、浊度等指标的影响。结果表明:三峡成库后泥沙更易沉降,引起水体浊度降低、透明度增大,这可能利于藻类的生长,导致叶绿素a的质量浓度增加,同时,泥沙沉降也使水体的溶解性氮磷比增大,对富营养化发生有抑制作用。

Influence of the suspended sediment on the relevant factors of Yangtze river's eutrophication

In this paper,the influence of the suspended sediment on the relevant factors of Yangtze river's eutrophication in Three Gorges Area in Chongqing were studied after the Three Gorges dam is put into operation.There is a mass of suspended sediment in the Three Gorge Reservoir.The impact on water environment of the suspended sediment should be received more attention.In order to offer the scientific basis to predict the occurrence of eutrophication in Chongqing section after the reservoir is formed,the impact on chlorophyll a,transparency,dissolving total phosphorus(TP),dissolving total nitrogen(TN),turbid degree of suspended sediment in water are discussed though the simulant test on the influence of the suspended sediment on water quality in this article.The results show that the suspended sediment will be inclined to settle after the reservoir is formed,which will cause the turbid de-gree reducing,and the transparency increasing.All of these may accelerate the algal growth and the chlorophyll a content increasing while the increasing of the ratio between TP and TN will hold back the occurrence of eutrophication.