气候变化领域集成服务门户(CCPortal): Seasonal Variation, Degradation, and Bioavailability of Dissolved Organic Matter in the Changjiang Estuary and its Adjacent East China Sea

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DOI	10.1029/2020JC016648
	Seasonal Variation, Degradation, and Bioavailability of Dissolved Organic Matter in the Changjiang Estuary and its Adjacent East China Sea
	Ji C.-X.; Chen Y.; Yang G.-P.
发表日期	2021
ISSN	21699275
卷号	126 期号:3
英文摘要	Systematic surveys to examine seasonal variation, degradation, and bioavailability of dissolved organic matter (DOM) in the Changjiang Estuary and the adjacent East China Sea were conducted in July 2016 and February 2017. Concentrations of dissolved organic carbon (DOC) and total hydrolyzable amino acids (THAA) were higher in July than in February. THAA and chlorophyll a (Chl-a) were positively correlated in July, but not in February. The carbon normalized yields of THAA (THAA-C%) in surface waters in July and February were not significantly different. However, degradation index (DI) values in the surface water were higher in February than in July. Compared with outer estuary, the inner estuary had lower THAA-C% and DI values in both surveys. Solar radiation experiments showed that THAA and THAA-C% values increased with time at station A6-11 in the oceanic water but declined at C3 in the freshwater, possibly due to the different origins, chemical compositions, or initial degradation states of the DOM at the time of collection. Microbial incubation experiments showed that accumulated DOC and DON in surface waters were bioavailable to the microbial community of the surface layer, but recalcitrant to the microbial fauna from the bottom layer. Leucine (Leu) was selectively consumed, while glycine (Gly), threonine, and alanine appeared to be recalcitrant in summer (July) microbial incubations; and histidine, Gly, and methionine were preferentially consumed, while aspartic acid, serine, phenylalanine, and Leu were recalcitrant in winter (February) incubations. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Amino acids; bioavailability; Changjiang Estuary; dissolved organic matter; East China Sea; incubation experiment
语种	英语
来源期刊	Journal of Geophysical Research: Oceans
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/186422
作者单位	Frontiers Science Center for Deep Ocean Multispheres and Earth System, and Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao, China; Laboratory for Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao, China; Institute of Marine Chemistry, Ocean University of China, Qingdao, China
推荐引用方式 GB/T 7714	Ji C.-X.,Chen Y.,Yang G.-P.. Seasonal Variation, Degradation, and Bioavailability of Dissolved Organic Matter in the Changjiang Estuary and its Adjacent East China Sea[J],2021,126(3).
APA	Ji C.-X.,Chen Y.,&Yang G.-P..(2021).Seasonal Variation, Degradation, and Bioavailability of Dissolved Organic Matter in the Changjiang Estuary and its Adjacent East China Sea.Journal of Geophysical Research: Oceans,126(3).
MLA	Ji C.-X.,et al."Seasonal Variation, Degradation, and Bioavailability of Dissolved Organic Matter in the Changjiang Estuary and its Adjacent East China Sea".Journal of Geophysical Research: Oceans 126.3(2021).