NDLI: Eutrophication status of the Daning River within the Three Gorges Reservoir and its controlling factors before and after experimental impoundment

Content Provider	Springer Nature Link
Author	Zhang, Jia Lei Wang, Li Jing Zheng, Bing Hui Liu, De Fu Yang, Zheng Jian
Copyright Year	2016
Abstract	We evaluated 4-year-old data set to assess the trophic state and the controlling factors of the TGR during different experimental impounding (January 2005 to December 2005, stage I–stage II; January 2007 to December 2007, stage II–stage III; January 2009 to December 2009, stage III–stage IV) and normal operating (January 2011 to December 2011, stage IV) periods. The trophic state indices (TSI$_{TP}$) increased in the study area after TGR impoundment, and the TSI$_{SD}$ and TSI$_{CHL}$ did not significantly change after TGR impoundment; the values of TSI$_{CHL}$ only increased at S1 (upstream sampling sites) after the TGR impoundment. The TSI$_{SD}$ values in the Daning River (S1, S2, and S3) and the main stream of the TGR (S4) showed similar seasonal variations, with the highest values observed in the flood seasons, followed by the normal seasons and the dry seasons in descending order. The TSI$_{CHL}$ only values varied substantially among the three seasons in the backwater area of the Daning River (S2), with the highest value occurring in the flood seasons, followed by dry seasons and normal seasons. The differences in the trophic state indices became smaller between the three seasons after TGR impoundment. The values of TSI$_{TP}$ and TSI$_{SD}$ showed similar spatial variances, with the highest value observed at S4, followed by S3, S2, and S1 in descending order. The TSI$_{CHL}$ values were higher at S2 than at S3, S1, and S4. The results showed that the phosphorus and nonalgal turbidity limit trophic status of the mainstream of TGR and Daning River before and after experimental impoundment.
Starting Page	1
Ending Page	11
Page Count	11
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	75
Issue Number	15
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2016-08-16
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eutrophication Trophic state indices Ecosystem-specific metrics of eutrophication assessment Daning River Three Gorges Reservoir Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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