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Refractory humic-like dissolved organic matter fuels microbial communities in deep energy-limiting marine sediments

Science China Earth Sciences 2023年第8期66卷 1738-1756页

作者： Yunru CHEN Weikang SUI Jing WANG Ding HE Liang DONG Joanna JWANIEK Fengping WANG State Key Laboratory of Microbial Metabolism School of Life Sciences and BiotechnologyShanghai Jiao Tong UniversityShanghai 200240China School of Oceanography Shanghai Jiao Tong UniversityShanghai 200240China Southern Marine Science and Engineering Guangdong Laboratory(Zhuhai) Zhuhai 519000China Department of Ocean Science and the Southern Marine Science and Engineering Guangdong Laboratory(Guangzhou) The Hong Kong University of Science and TechnologyHong Kong 999077China School of Earth Sciences Zhejiang UniversityHangzhou 310027China Leibniz Institute for Baltic Sea Research WarnemündeRostock 18119Germany

Humic-like dissolved organic matter(DOM),usually regarded as refractory,is a major component of DOM in marine sediment pore ***,its bio-reactivity remains poorly explored in natural environments,which makes its roles in supporting subsurface microbial communities and regulating long-term carbon cycling ***,the bio-reactivity of humiclike DOM was evaluated by modeled reaction rates together with its interactions with microbial communities in five sediment cores collected from the eutrophic Pearl River Estuary to the oligotrophic deep-sea basin in the northern South China *** revealed contrasting relationships between humic-like DOM and microbes in the coastal and deep-sea *** eutrophic coastal sediments,specific microbial groups enriched in the deep layers co-varied with humic-like DOM,while most microbial groups were significantly correlated with protein-like DOM,microbial transformation of which likely resulted in the production of humic-like *** the contrary,in energy-limiting deep-sea sediments,over 70%of the microbial groups were found closely correlated with humic-like DOM,a net consumption of which was demonstrated in deep *** consumption of humic-like DOM in deep-sea sediments reduced its total production flux in the uppermost~5-meter layer to about one-tenth of that in coastal sediments,which could consequently decrease the refractory DOM flux to the overlying seawater and influence long-term oceanic carbon cycling.

关键词： Fluorescent dissolved organic matter Subsurface microbial communities Marine sediments Microbial transformation oceanic carbon cycling

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