气候变化领域集成服务门户(CCPortal): Eutrophication Leads to Accumulation of Recalcitrant Autochthonous Organic Matter in Coastal Environment

CCPortal

DOI	10.1029/2017GB005848
	Eutrophication Leads to Accumulation of Recalcitrant Autochthonous Organic Matter in Coastal Environment
	Asmala E.; Haraguchi L.; Markager S.; Massicotte P.; Riemann B.; Staehr P.A.; Carstensen J.
发表日期	2018
ISSN	0886-6236
EISSN	1944-9224
起始页码	1673
结束页码	1687
卷号	32 期号:11
英文摘要	Anthropogenic nutrient enrichment is changing the structure and the function of coastal ecosystems. These coastal zones are transitions between freshwater and marine systems where multiple biogeochemical processes remove, produce, and transform organic matter. The extent to which the coastal zone is merely a conduit for terrestrial (allochthonous) organic matter versus a distinct source of autochthonous organic matter fueled by eutrophication is unclear. To address this issue, we characterized the freshwater and marine dissolved organic matter (DOM) pools in a eutrophic estuary with a long water residence time (Roskilde Fjord, Denmark) over an annual cycle. We combined elemental, optical (absorbance and fluorescence), and isotopic analyses to obtain insight about the bulk properties of the DOM pool during this period. We also used sediment traps to analyze the changes related to the exchange of organic matter between the particulate organic matter and DOM fractions. The results showed that labile autochthonous DOM from in situ primary production was rapidly transformed to more recalcitrant DOM that accumulated in the estuary despite continuous exchange with the open sea. Also, parts of the particulate organic matter pool were degraded rapidly (within 24 hr) and transformed into the DOM pool. Accumulated DOM was characterized by relatively low molecular size and stable carbon isotopic value and by high protein-like fluorescence. These results indicate that autotrophic material can be a major source of specific recalcitrant DOM in eutrophic coastal waters, contributing significantly to the flux of organic carbon to the ocean. ©2018. American Geophysical Union. All Rights Reserved.
英文关键词	CDOM; dissolved organic matter; estuarine mixing; nutrient cycling
语种	英语
scopus关键词	anthropogenic effect; autochthony; coastal zone; dissolved organic matter; estuarine pollution; eutrophic environment; eutrophication; freshwater ecosystem; isotopic analysis; marine ecosystem; mixing; nutrient cycling; nutrient enrichment; organic matter; primary production; Denmark; Roskilde Fjord
来源期刊	Global Biogeochemical Cycles
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/129776
作者单位	Tvärminne Zoological Station, University of Helsinki, Hanko, Finland; Department of Bioscience, Aarhus University, Roskilde, Denmark; Takuvik Joint International Laboratory, Université Laval and Centre National de la Recherche Scientifique, Québec, QC, Canada
推荐引用方式 GB/T 7714	Asmala E.,Haraguchi L.,Markager S.,et al. Eutrophication Leads to Accumulation of Recalcitrant Autochthonous Organic Matter in Coastal Environment[J],2018,32(11).
APA	Asmala E..,Haraguchi L..,Markager S..,Massicotte P..,Riemann B..,...&Carstensen J..(2018).Eutrophication Leads to Accumulation of Recalcitrant Autochthonous Organic Matter in Coastal Environment.Global Biogeochemical Cycles,32(11).
MLA	Asmala E.,et al."Eutrophication Leads to Accumulation of Recalcitrant Autochthonous Organic Matter in Coastal Environment".Global Biogeochemical Cycles 32.11(2018).