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

Hu, Jun, Qiao, Ye, Zhou, Lianfeng, Li, Sixin·2012·Environmental Science and Pollution Research
DOI 10.1007/s11356-012-0791-6
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Abstract

Introduction 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. Methods 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. Results and discussion 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 the occurrence of algae blooms. The high consternation of phosphorus and the low N:P ratio show that the water body can be in the process of eutrophication during the discharge of Gezhouba Dam. In fact, Chl.a ha…

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Metadata

Authors
Hu, J., Qiao, Y., Zhou, L., & Li, S.
Venue
Environmental Science and Pollution Research
Publisher
Springer Science and Business Media LLC
Published
2012-02-17
Volume
19
Issue
7
Pages
2849-2859
ISSN
  • 0944-1344
  • 1614-7499
DOI
10.1007/s11356-012-0791-6
Cited by
24
References
0
Language
en
Licence
www.springer.com/tdm (tdm)

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Hu, J., Qiao, Y., Zhou, L., & Li, S. (2012). Spatiotemporal distributions of nutrients in the downstream from Gezhouba Dam in Yangtze River, China. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-012-0791-6