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Influence of Three Gorges Dam and drought on particulate organic carbon flux and its source in the lower Yangtze River

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Abstract

The Yangtze River basin regulated by the gigantic Three Gorges Dam (TGD) is the best location to study the impacts of intense anthropogenic modifications on the global biogeochemical cycles. However, frequent drought periods commencing from 2006 to 2011 may equally act as a strong factor influencing the particulate organic matter (POM) flux. To capture the distinctive role of TGD operations and drought severity on the POM, weekly sampling of total suspended matter (TSM) concentration was conducted at Nantong in the lower Yangtze basin. Biogeochemical parameters (POC% of TSM, PN% of TSM, C/N ratios, and δ13C), CaCO3%, mean suspended sediment size, and drought parameters (mean temperature, solar radiation, relative humidity, wind speed, evapotranspiration, and rainfall) were evaluated. The inverse power-law correlation between TSM-POC% and TSM-PN% was observed and POC% during 2008–2009 was found to be higher than pre-dam values. The δ13C and C/N range from − 25.6 to − 24.1‰ and 4.8 to 9.2, and moderate negative correlation between CaCO3-POC% and POC%-δ13C were observed. Principal component analysis stipulates that high temperature and solar radiation enhanced evapotranspiration and TGD operations were not found to promote drought in the lower Yangtze basin. The results evince the potential shift of POM source from terrestrial to aquatic biological activity was related to low discharge, low TSM concentration, and dry conditions. The study advances our understanding of the impacts of hydrological connectivity on the POM pool and accentuates the role of phytoplankton as a dominant source of POM in regulated river channels.

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Data availability

The data used in the study is compiled in Supplementary file1. Further, the MERRA (Modern-Era Retrospective analysis for Research and Applications) and CFSR (Climate Forecast System Reanalysis (CFSR) database used to generate results is available in the public domain at websites http://www.soda-pro.com/web-services/meteo-data/merra and https://globalweather.tamu.edu/.

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Acknowledgements

SP acknowledges funding from the China Postdoctoral Science Foundation Grant 2019M651565 and appreciates Dr Ergang Lian (State Key Laboratory of Marine Geology, Tongji University) for discussion on the manuscript. We acknowledge two anonymous reviewers for their critical and constructive reviews which significantly improved the quality of the manuscript.

Funding

This work was supported by Postdoctoral Research Foundation of China [Grant No. 2019M651565]. No external funding was obtained for this work.

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Correspondence to S. Panwar.

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Panwar, S., Yang, S. Influence of Three Gorges Dam and drought on particulate organic carbon flux and its source in the lower Yangtze River. Biogeochemistry 158, 269–284 (2022). https://doi.org/10.1007/s10533-022-00889-w

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