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Influence of Hydrodynamics on the Composition and Reactivity of Particulate Organic Matter in a Large River Influenced Ocean Margin

文献类型：期刊论文

作者Guo, Jinqiang1,4,5; Zhou, Bu2,3,4,5; Achterberg, Eric P.1; Song, Jinming2,3,4,5; Duan, Liqin2,3,4,5; Li, Xuegang2,3,4,5; Yuan, Huamao2,3,4,5
刊名JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS
出版日期2024-02-01
卷号129期号:2页码:15
ISSN号2169-9275
关键词particulate organic matter amino acids hydrodynamic process reactivity ocean margin
DOI10.1029/2023JC020488
通讯作者Song, Jinming(yuanhuamao@qdio.ac.cn) ; Yuan, Huamao(yuanhuamao@qdio.ac.cn)
英文摘要Marginal seas influenced by large rivers are characterized by complex hydrodynamic and organic matter cycling processes. However, the impacts of hydrodynamics on the composition and reactivity of particulate organic matter (POM) remain unclear. Here we conducted a comprehensive study on the bulk, molecular and biological properties of suspended POM in the Changjiang Estuary and adjacent area subjected to strong currents, eddies as well as typhoons during spring and autumn. D/L-enantiomers of particulate amino acids (PAA) were analyzed to evaluate the bioreactivity of POM and quantify bacterial-derived organic carbon. We found that POM bioavailability as indicated by carbon-normalized yields of PAA (PAA-C%) reflected the ecosystem productivity. Relatively high PAA-C% values (20-35%) were observed in productive areas influenced by Changjiang River plume, cyclonic eddies and typhoons, likely related to the enhanced nutrient availability arising from hydrodynamic processes. In contrast, the oligotrophic Taiwan Warm Current-influenced regions featured relatively low POM bioavailability (PAA-C% < 10%) despite typhoons facilitating water mixing. The PAA-C% values showed a significant positive correlation with extracellular enzyme activity, indicating that bioavailable POM can rapidly stimulate heterotrophic transformation. Hot spots of elevated bioavailable POM showed high contributions of bacterial organic carbon. A large portion (similar to 2/3) of bacterial organic carbon was present in the form of bacterial detritus, suggesting that patches of these biological hot spots represent important sites of carbon sequestration. Together, our findings indicate that fresh POM production is largely controlled by nutrient supply driven by hydrodynamic processes, with important implications for carbon sequestration in the dynamic ocean margins.
WOS关键词CHANGJIANG YANGTZE-RIVER ; EAST CHINA SEA ; MAJOR BACTERIAL CONTRIBUTION ; BIOLOGICAL HOT-SPOTS ; AMINO-ACIDS ; DIAGENETIC ALTERATION ; PRIMARY PRODUCTIVITY ; PHYTOPLANKTON BLOOM ; SEASONAL-VARIATION ; TEMPORAL VARIATION
资助项目National Natural Science Foundation of China ; China Scholarship Council (CSC) ; Deutscher Akademischer Austauschdienst (DAAD) ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA23050501] ; Shandong Provincial Natural Science Foundation[ZR2020YQ28] ; Taishan Scholars Program[tsqn202211256] ; [42276038] ; [LSKJ202204001]
WOS研究方向Oceanography
语种英语
出版者AMER GEOPHYSICAL UNION
WOS记录号WOS:001153860700001
源URL[http://ir.qdio.ac.cn/handle/337002/184422]  
专题海洋研究所_海洋生态与环境科学重点实验室
通讯作者Song, Jinming; Yuan, Huamao
作者单位1.GEOMAR Helmholtz Ctr Ocean Res Kiel, Marine Biogeochem Div, Kiel, Germany
2.Laoshan Lab, Lab Marine Ecol & Environm Sci, Qingdao, Peoples R China
3.Chinese Acad Sci, Ctr Ocean Mega Sci, Qingdao, Peoples R China
4.Chinese Acad Sci, Key Lab Marine Ecol & Environm Sci, Inst Oceanol, Qingdao, Peoples R China
5.Univ Chinese Acad Sci, Beijing, Peoples R China
推荐引用方式
GB/T 7714		 Guo, Jinqiang,Zhou, Bu,Achterberg, Eric P.,et al. Influence of Hydrodynamics on the Composition and Reactivity of Particulate Organic Matter in a Large River Influenced Ocean Margin[J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,2024,129(2):15.
APA Guo, Jinqiang.,Zhou, Bu.,Achterberg, Eric P..,Song, Jinming.,Duan, Liqin.,...&Yuan, Huamao.(2024).Influence of Hydrodynamics on the Composition and Reactivity of Particulate Organic Matter in a Large River Influenced Ocean Margin.JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS,129(2),15.
MLA Guo, Jinqiang,et al."Influence of Hydrodynamics on the Composition and Reactivity of Particulate Organic Matter in a Large River Influenced Ocean Margin".JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS 129.2(2024):15.

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来源：海洋研究所

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