Abstract
Artificial reservoirs play an important role in intercepting organic carbon (OC), which affects the carbon cycle of inland waters. However, limited by the methods of field observations, studies on the potential carbon sink of sediment in reservoirs are not accurate enough. In this study, we investigated OC accumulation in the Wujiangdu Reservoir (WJDR), a canyon reservoir located in a karst area of Southwest China, by coupling seismic survey data with physicochemical data of sediment cores. The results showed that irregular underwater topography resulted in spatial heterogeneity of the sediment deposition. The mean OC accumulation rate in the WJDR was 579.2 g C m−2 year−1, and the OC accumulation flux of the WJDR was 1.4 × 1010 g C year−1. δ13C values coupled with a mixing model indicated that the autochthonous OC ranged from 14.2 to 97.0% of the total OC in the sediment, with an average of 48.4%. The significantly positive relationship between autochthonous OC and TN indicated that the autochthonous OC generated in the reservoir was associated with nutrient input. The autochthonous OC accumulation flux was 6.6 × 109 g C year−1, which was equal to 2.3 times the carbon emission from the reservoir surface to the atmosphere as CO2-C, indicating that the autochthonous OC produced within the reservoir is a large carbon sink.
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Acknowledgments
We would like to thank Hao Bin Wei, Ning **ao Yu, and Jia Qi Huang for their help in field sampling.
Funding
This study was funded by the National Key Research and Development Program of China (2016YFA0601003), the Shanghai Science and Technology Development Foundation (19010500100), and the National Natural Science Foundation of China (41573064).
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Qin, Y., Hao, F., Zhang, D. et al. Accumulation of organic carbon in a large canyon reservoir in Karstic area, Southwest China. Environ Sci Pollut Res 27, 25163–25172 (2020). https://doi.org/10.1007/s11356-020-08724-1
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DOI: https://doi.org/10.1007/s11356-020-08724-1