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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

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Acta Geochimica 2022年第5期41卷 753-764页

作者： Li Gao Xin Lin Jun Fan Ming Yang Xueping Chen FushunWang Jing Ma School of Environmental and Chemical Engineering Shanghai UniversityShanghai 200444China Shimadzu(Shanghai) Global Laboratory Consumables Co.LtdShanghai 200233China

Organic carbon(oc)source attribution for cascade reservoir sediments has been identified as a critical gap in understanding the effective carbon sink of inland *** this study,nine sediment cores were collected from cascade reservoirs in the Wujiang and Pearl *** analyzed lignin phenol(Λ8),total organic carbon(Toc)content,and stable carbon isotopic composition(δC)of the sediments,focusing on the changes of terrigenous oc,and the variation of oc source in cascade reservoir sediments after *** results showed that theΣ8 and Toc contents decreased from upstream to downstream reservoirs,indicating the significant interception of terrigenous oc by cascade ***,theΛ8 content in the Pearl River reservoir sediments was much higher than that in the Wujiang *** the three-end-member mixing model,we estimated that oc in reservoir sediments mainly comes from soil and *** damming,the proportion of plankton oc in Toc slightly increased in seasonal and annual regulation reservoirs due to the limnetic evolution of the *** 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.

关键词： Cascade reservoirs Terrigenous oc Lignin autochthonous oc Three-end-member mixing model

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