气候变化领域集成服务门户(CCPortal): The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of southeast Alaska

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DOI	10.1007/s10533-021-00815-6
	The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of southeast Alaska
	Holt A.D.; Fellman J.; Hood E.; Kellerman A.M.; Raymond P.; Stubbins A.; Dittmar T.; Spencer R.G.M.
发表日期	2021
ISSN	1682563
英文摘要	Climate change is melting glaciers and altering watershed biogeochemistry across the globe, particularly in regions dominated by mountain glaciers, such as southeast Alaska. Glacier dominated watersheds exhibit distinct dissolved organic matter (DOM) characteristics compared to forested and vegetated watersheds. However, there is a paucity of information on how stream DOM composition changes as glaciers retreat and terrestrial ecosystem succession ensues. Importantly, it is unclear over what timescales these transformations occur. Here, we used bulk, isotopic and ultrahigh resolution molecular-level techniques to assess how streamwater DOM composition evolves in response to glacier retreat and subsequent terrestrial ecosystem succession. For this, water samples were collected from eleven streams across a chronosequence spanning a temporal gradient 0 to ~ 1400 years since glacier retreat in coastal, southeast Alaska. During the first ~ 200 years since glacier retreat, stream DOM showed marked and consistent changes in bulk, isotopic, and molecular-level composition. In particular, there was a decreased relative abundance (RA) of ancient, energy-rich (e.g., elevated aliphatic contribution), low aromaticity (e.g., low SUVA254 and AImod) DOM and an increased RA of soil and vegetation derived aromatic DOM (e.g., more depleted δ13C, elevated condensed aromatic and polyphenolic contribution) that had a modern radiocarbon age. After ~ 200 years of ecosystem development, DOM composition was comparable to that observed for other temperate and arctic forested watersheds without permafrost influence. These results underscore the timelines on which glacier retreat may have substantial impacts on watershed biogeochemistry and coastal ecosystems that receive DOM from these rapidly changing landscapes. © 2021, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
英文关键词	Carbon isotopes; Deglaciation; Dissolved organic carbon; FT-ICR MS; Glacier bay; Succession
语种	英语
来源期刊	Biogeochemistry
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/184645
作者单位	National High Magnetic Field Laboratory Geochemistry Group and Department of Earth, Ocean, and Atmospheric Science, Florida State University, Tallahassee, FL 32306, United States; Alaska Coastal Rainforest Center and Environmental Science Program, University of Alaska Southeast, Juneau, AK 99801, United States; Yale School of the Environment, Yale University, New Haven, CT 06511, United States; Departments of Marine and Environmental Science, Civil and Environmental Engineering, and Chemistry and Chemical Biology, Northeastern University, Boston, MA 02115, United States; Institute for Chemistry and Biology of the Marine Environment (ICBM), University of Oldenburg, Oldenburg, Germany; Helmholtz Institute for Functional Marine Biodiversity (HIFMB) at the University of Oldenburg, Oldenburg, Germany
推荐引用方式 GB/T 7714	Holt A.D.,Fellman J.,Hood E.,et al. The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of southeast Alaska[J],2021.
APA	Holt A.D..,Fellman J..,Hood E..,Kellerman A.M..,Raymond P..,...&Spencer R.G.M..(2021).The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of southeast Alaska.Biogeochemistry.
MLA	Holt A.D.,et al."The evolution of stream dissolved organic matter composition following glacier retreat in coastal watersheds of southeast Alaska".Biogeochemistry (2021).