Compositional changes of dissolved organic molecules along water flow and their influencing factors in the Three Gorges Reservoir

Yang, Jian; Huang, Liuqin; She, Weiyu; Wu, Geng; Wan, Yunyang; Dong, Hailiang; Chu, Rosalie K.; Tolic, Nikola; Jiang, Hongchen

doi:10.1016/j.chemgeo.2023.121741

Compositional changes of dissolved organic molecules along water flow and their influencing factors in the Three Gorges Reservoir

Journal Article · Thu Sep 21 00:00:00 EDT 2023 · Chemical Geology

DOI:https://doi.org/10.1016/j.chemgeo.2023.121741· OSTI ID:2340093

Yang, Jian ^[1]; Huang, Liuqin ^[1]; She, Weiyu ^[1]; Wu, Geng ^[1]; Wan, Yunyang ^[2]; Dong, Hailiang ^[1]; Chu, Rosalie K. ^[3]; Tolic, Nikola ^[3]; Jiang, Hongchen ^[1]

China University of Geosciences (Wuhan) (CUG), (China)
China Univ. of Petroleum, Beijing (China)
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Molecular composition of dissolved organic matter (DOM) and its influencing factors in river reservoirs remains elusive. Here, molecular compositions of DOM, bacterial community structures, and water physiochemistry were investigated in the field and microcosm samples of the Three Gorges Reservoir (TGR). The results showed that DOM molecular compositions were significantly (R² = 0.245, p < 0.001) correlated with bacterial community structures in the studied field samples, suggesting that bacteria may actively interact with DOM molecules. In this study, the molecular compositions of DOM in the studied field samples were significantly (p < 0.05) affected by the distance between the sample sites and the Three Gorges Dam and by bacterial groups of Actinobacteria and Alphaproteobacteria, suggesting that both hydrological and bacterial processes may contribute to the variation in DOM molecular composition in the TGR water. Furthermore, microcosm experiments demonstrated that both microbial and abiotic processes may transform and/or produce DOM in the TGR, thereby affecting DOM molecular composition. Microbial process increased the average aromaticity index and decreased the carbon number of DOM molecules with increasing incubation duration; whereas average oxygen number, double bond equivalent, and oxidation state of carbon of DOM molecules increased during the first 14 days of incubation and began to decrease thereafter. Taken together, this study expands our understanding of the impact of microbial process on the DOM molecular composition in reservoir ecosystems, and has great implications for carbon cycling in major rivers.

View Accepted Manuscript (DOE)

Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: National Natural Science Foundation of China (NSFC); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 2340093

Report Number(s):: PNNL-SA--154608

Journal Information:: Chemical Geology, Journal Name: Chemical Geology Vol. 639; ISSN 0009-2541

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

58 GEOSCIENCES
Bacterial community
DOM degradation
Dissolved organic matter
Molecular composition
Three Gorges Reservoir

Compositional changes of dissolved organic molecules along water flow and their influencing factors in the Three Gorges Reservoir

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