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14 results on '"Zhang, Lianbao"'

7. Microbially driven fate of terrigenous particulate organic matter in oceans

Author

Zhang, Lianbao, primary, Chen, Mingming, additional, Zheng, Yue, additional, Wang, Jianning, additional, Xiao, Xilin, additional, Chen, Xiaowei, additional, Hu, Chen, additional, Shen, Jiaming, additional, Liu, Jihua, additional, Tang, Kai, additional, Xu, Dapeng, additional, Shi, Qiang, additional, Ning, Xiaoyan, additional, Thomas, Helmuth, additional, Qin, Wei, additional, Zhao, Meixun, additional, Jiao, Nianzhi, additional, and Zhang, Yao, additional

Published
2022
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10. Biodegradation of Terrigenous Organic Matter in a Stratified Large-Volume Water Column: Implications of the Removal of Terrigenous Organic Matter in the Coastal Ocean

Author

Xiao, Xilin, primary, Powers, Leanne C., additional, Liu, Jihua, additional, Gonsior, Michael, additional, Zhang, Rui, additional, Zhang, Lianbao, additional, MacIntyre, Hugh L., additional, Chen, Xiaowei, additional, Hu, Chen, additional, Batt, John, additional, Shi, Qiang, additional, Xu, Dapeng, additional, Zhang, Yao, additional, and Jiao, Nianzhi, additional

Published
2022
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12. Microbially driven fate of terrigenous particulate organic matter in oceans.

Author

Zhang, Lianbao, Chen, Mingming, Zheng, Yue, Wang, Jianning, Xiao, Xilin, Chen, Xiaowei, Hu, Chen, Shen, Jiaming, Liu, Jihua, Tang, Kai, Xu, Dapeng, Shi, Qiang, Ning, Xiaoyan, Thomas, Helmuth, Qin, Wei, Zhao, Meixun, Jiao, Nianzhi, and Zhang, Yao

Subjects
*ORGANIC compounds, *OCEAN, *OCEANOGRAPHY, *AROMATIC compounds, *CARBON cycle, *NITROGEN cycle, *SIMULATION methods & models
Abstract

A long‐standing enigma in oceanography is why terrestrial organic matter is "missing" in the global ocean, despite the considerable discharge into it every year. Although some explanations, such as mineralogical composition, hydrodynamic processes, and priming effect, have been proposed, we hypothesize that the essential mechanism behind the missing organic matter is microbial processing, for which the underlying coupled geochemical, molecular, and genetic evidence is unknown. An ultra‐large‐volume, long‐term river–seawater stratified simulation system was constructed to unravel the microbially driven fate of terrigenous particulate organic matter (POM) in oceans. Analysis of combining the molecular with POM chemical composition data suggests that Bacteroidetes could act as pioneers in the processing of terrigenous POM in oceans, degrading high‐molecular‐weight, high‐carbon compounds such as polysaccharides. Remaining low‐molecular‐weight nitrogenous organic matter is subsequently degraded by Planctomycetes and Proteobacteria. Isotopic signals show that this preferential degradation causes a distinct "aging" effect of POM, and along with nitrification enhanced by remineralization, causes a decrease in the POM C : N ratio. Degradation of terrigenous POM and bacterial biomass biosynthesis leads to positive deviations in δ15N and δ13C. Relatively refractory hydrocarbons, aromatic compounds, and phenols are accumulated by microbial processes in this system. This study provides mechanistic insights into the missing chemical and isotopic signals and microbially driven fate of terrigenous POM in the ocean, with important implications for how riverine material input affects marine carbon and nitrogen cycling. [ABSTRACT FROM AUTHOR]

Published
2023
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