Abstract
Danjiangkou reservoir is the water intake of the north-to-south water transfer middle route project and the largest freshwater lake in Asia. According to the operation mode of the reservoir, a large area is formed in the alternating state of drying-flooding annually and this may cause eutrophication in the aquatic ecosystem. The effects of drying-flooding alteration on nitrogen fluxes in the hydro-fluctuation belt of the Danjiangkou reservoir were investigated by conducting three experimental treatments of long-term (LFD), short-term drying-flooding alternating frequency (SFD), and continuous flooding (CF) with indoor incubation experiment. The results showed that the periodic drying-rewetting state is adverse to the ammonium release. The average exchange fluxes of NH4+-N in treatment LFD, SFD, and CF were -10.27, 11.79, and 48.12 mg m−2 d−1, respectively. The varying frequency of periodic drying-flooding had little influence on the exchange fluxes of TDN (FTDN-LFD = -50.52 mg m−2 d−1, FTDN-SFD = -51.60 mg m−2 d−1), but it affected the exchange fluxes significantly for different forms of nitrogenous compounds; the exchange fluxes of ammonium and nitrate in SFD treatment (11.79 and 3.77 mg m−2 d−1) were higher than those in LFD treatment (-10.27 and 0.43 mg m−2 d−1). Ammonium is the main nitrogen form in the bodies of water with long-term inundation; by extending the drying period of the sediment, the ammonium concentrations decreased while the nitrate concentrations increased.
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Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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Acknowledgements
We are grateful to Shen Zhao, Guohao Li, Kun Lu, and Yakun Wang, from the Water Resources Department of North China University of Water Resources and Electric Power, for their valuable assistance in initially filed work, setting up the experimental mesocosms, and undertaking preliminary monitoring.
Funding
This research was financially supported by the National Science Foundation of China (Grant No.51679089) and the Innovation Foundation of North China University of Water Resources and Electric Power for PhD Graduates.
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Conceptualization: H.W. and Y.P.H; sampling: H.W and Q.W.; incubation experiment: H.W.; sample measurement: H.W.; and writing—original draft: H.W. All authors contributed to the drafting and approval of the manuscript for submission.
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Wang, H., Wu, Q. & Han, Y. Effects of Drying-Flooding Alternation on Sediment–Water Nitrogen Fluxes in Hydro-fluctuation Belt of the Danjiangkou Reservoir. Water Air Soil Pollut 233, 71 (2022). https://doi.org/10.1007/s11270-022-05546-4
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DOI: https://doi.org/10.1007/s11270-022-05546-4