Spatiotemporal distributions of nutrients in the downstream from Gezhouba Dam in Yangtze River, China.

Environmental Science and Pollution Research International
Jun HuSixin Li

Abstract

From December 2008 to November 2009, an investigation of water quality was performed in the 70-km long downstream from Gezhouba Dam in Yangtze River. Twelve sites in all were chosen. Nine parameters of water quality including the total phosphorus, the total nitrogen, chlorophyll a (Chl.a), nitrite, nitrate, ammonia, water temperature, DO, and pH were monitored almost monthly. The multivariate statistical technique (cluster analysis) and the nonparametric method (Kruskal-Wallis Test and Spearman's rank correlation) were applied to evaluate the spatiotemporal variations of water quality data sets. According to the Chinese environmental quality standards for surface water (GB3838-2002), the water quality in the river section investigated can attain to the III water standards except total nitrogen. Further analysis indicated that there were no significant spatial differences in these parameters of water quality, but the sampling date had a significant effect. The temporal variation of water quality can be related to the discharge of Gezhouba Dam and moreover be affected by the reservoir regulation. During the discharge, the discharge increased the concentration of total phosphorus and then decreased the N:P ratio, which helps to th...Continue Reading

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Citations

Feb 28, 2013·Environmental Science and Pollution Research International·Adamu MustaphaNura Umar Kura
Jun 12, 2013·Environmental Science and Pollution Research International·Chengchun SunLei Chen
Oct 2, 2013·Environmental Science and Pollution Research International·Jiabo Chen, Jun Lu
Jun 29, 2013·Environmental Science and Pollution Research International·Shou ZhaoZhenyao Shen

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