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Change characteristics of DSi and nutrition structure at the Yangtze River Estuary after Three Gorges Project impounding and their ecological effect

Lei Li Xinqiang Shen Mei Jiang
Archives of Environmental Protection | 2017 | vol. 43 | No 2 | DOI: 10.1515/aep-2017-0012
Keywords Three Gorges Project Yangtze River Estuary DSi nutrition structure
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Abstract

The variation law of dissolved silica (DSi), dissolved inorganic nitrogen (DIN), dissolved inorganic phosphorus (DIP) and nutrition structure after the Three Gorges Project (TGP) impounding as well as their ecological effect were analyzed according to monitoring survey of the Yangtze River Estuary in spring (May) and summer (August) from 2004-2009. The results showed that after impounding, DSi and DIN concentration decreased and increased, respectively. During the study period, DSi decreased by about 63%, while DIN almost tripled. DIP concentration fluctuated slightly. With respect to nutrition structure, N:P increased, whereas Si:P and Si:N declined. According to chemometry standard of nutrient limits, nutrition structure tended to be imbalanced and the limiting factor of phytoplankton growth (P) was studied. Changes of nutrition structure have largely decreased diatom and caused different composition of dominant phytoplankton species. This may change ecosystem structure of the Yangtze River Estuary.

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Authors and Affiliations

Lei Li
Xinqiang Shen
Mei Jiang

Seasonal characteristics of nutrient and nutrient structure in the Yangtze River estuary

Lei Li Guodong Xv Yingjie Zheng Mei Jiang
Archives of Environmental Protection | 2023 | vol. 49 | No 3 | 115-122 | DOI: 10.24425/aep.2023.147334
Keywords Yangtze River estuary nutrient spatial and temporal distribution trophic structure
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Abstract

This data article aimed to evaluate the influencing mechanisms of the nutrients and the level of eutrophication in the Yangtze River estuary. The seasonal characteristics of nutrients (dissolved inorganic nitrogen (DIN), SiO32−–Si, and PO4 3–P) in the seawater of the Yangtze River estuary were analyzed by conducting surveys in spring and summer of 2019. The findings revealed that the concentrations of all nutrient at the surface and bottom layers were lower in spring compared to summer. NO3 −–N was typically the major form of DIN. Runoff was identified as the primary source of DIN and SiO3 2−–Si, while PO4 3−–P originated from a various sources.The SiO32−–Si/PO43−–P and DIN/PO43−–P values in the surface and bottom layers during the spring and summer were higher than the Redfield values, indicating an imbalanced nutrient distribution. Furthermore, discrepancies were observed in the distributions of DIN/PO4 3−–P, SiO3 2−–Si/DIN, and SiO3 2−–Si/PO4 3−–P in the Yangtze River estuary. Through an examination of the ratio of DIN/PO4 3−–P absorbed by phytoplankton, PO4 3−–P was identified as a potential limiting factor for nutrition in the sea area of the Yangtze River estuary during spring and summer. The Eutrophication Index (E) values for both spring and summer were found to be higher than the eutrophication threshold, indicating severe eutrophication in the studied sea area.
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Authors and Affiliations

Lei Li
1
Guodong Xv
1
Yingjie Zheng
1
Mei Jiang
1
  1. East China Sea Fisheries Research Institute Chinese Academy of Fishery Sciences, China

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