Abstract
Organic carbon (OC) source attribution for cascade reservoir sediments has been identified as a critical gap in understanding the effective carbon sink of inland waters. In this study, nine sediment cores were collected from cascade reservoirs in the Wujiang and Pearl Rivers. We analyzed lignin phenol (Λ8), total organic carbon (TOC) content, and stable carbon isotopic composition (δ13C) of the sediments, focusing on the changes of terrigenous OC, and the variation of OC source in cascade reservoir sediments after damming. Our results showed that the Σ8 and TOC contents decreased from upstream to downstream reservoirs, indicating the significant interception of terrigenous OC by cascade damming. Additionally, the Λ8 content in the Pearl River reservoir sediments was much higher than that in the Wujiang River. From the three-end-member mixing model, we estimated that OC in reservoir sediments mainly comes from soil and plankton. After damming, the proportion of plankton OC in TOC slightly increased in seasonal and annual regulation reservoirs due to the limnetic evolution of the reservoir. These findings suggest that the cascade damming increases the interception capacity of the river to terrigenous OC and nutrients, and that slowing of water velocity caused by damming affected primary productivity and fluvial carbon cycling.
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Acknowledgements
This study was funded by the National Key Research and Development Program of China (2016YFA0601003). The authors appreciate Li Lu and Nan Hu from Tianjing University for their assistance with stable isotope analysis.
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All authors contributed to the study conception and design. Li Gao: experimental analysis; data curation; formal analysis; writing—original draft; writing—review and editing. Xin Lin: sample collection; data curation; experimental analysis. Jun Fan: sample testing. Ming Yang: supervision. Xueping Chen: supervision. Fushun Wang: investigation. Jing Ma: validation; supervision.
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Gao, L., Lin, X., Fan, J. et al. Identification of terrigenous and autochthonous organic carbon in sediment cores from cascade reservoirs in the upper stream of Pearl River and Wujiang River, southwest China: lignin phenol as a tracer. Acta Geochim 41, 753–764 (2022). https://doi.org/10.1007/s11631-022-00551-0
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DOI: https://doi.org/10.1007/s11631-022-00551-0