Abstract
Water surface greenhouse gas (GHG) emissions in freshwater reservoirs are closely related to limnological processes in the water column. Affected by both reservoir operation and seasonal changes, variations in the hydro-morphological conditions in the river–reservoir continuum will create distinctive patterns in water surface GHG emissions. A one-year field survey was carried out in the Pengxi River–reservoir continuum, a part of the Three Gorges Reservoir (TGR) immediately after the TGR reached its maximum water level. The annual average water surface CO2 and CH4 emissions at the riverine background sampling sites were 6.23 ± 0.93 and 0.025 ± 0.006 mmol h−1 m−2, respectively. The CO2 emissions were higher than those in the downstream reservoirs. The development of phytoplankton controlled the downstream decrease in water surface CO2 emissions. The presence of thermal stratification in the permanent backwater area supported extensive phytoplankton blooms, resulting in a carbon sink during several months of the year. The CH4 emissions were mainly impacted by water temperature and dissolved organic carbon. The greatest water surface CH4 emission was detected in the fluctuating backwater area, likely due to a shallower water column and abundant organic matter. The Pengxi River backwater area did not show significant increase in water surface GHG emissions reported in tropical reservoirs. In evaluating the net GHG emissions by the impoundment of TGR, the net change in the carbon budget and the contribution of nitrogen and phosphorus should be taken into consideration in this eutrophic river–reservoir continuum.
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Acknowledgements
This study was supported by the National Natural Science Foundation (Nos. 51679226 and 41601537) and the National Science and Technology Major Project on Water Pollution Control and Management (2014ZX07104-006 and 2015ZX07103-007). The China Three Gorges Corporation provided financial support as well. Dr. Lindsey Yasarer was supported by the NSF EAPSI Award # IIA-1414818. We also thank Tao Jiang, Lei Bai, Lin Wang, Chen Zhang, Jing Liu, Zengyu Zhang, etc., who participated in field sampling and lab analysis. All the data in the manuscript are accessible and could be requested from the corresponding author whose email address is Lizhe@cigit.ac.cn.
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Huang, Y., Yasarer, L.M.W., Li, Z. et al. Air–water CO2 and CH4 fluxes along a river–reservoir continuum: Case study in the Pengxi River, a tributary of the Yangtze River in the Three Gorges Reservoir, China. Environ Monit Assess 189, 223 (2017). https://doi.org/10.1007/s10661-017-5926-2
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DOI: https://doi.org/10.1007/s10661-017-5926-2