气候变化领域集成服务门户(CCPortal): Evidence for ecosystem state shifts in Alaskan continuous permafrost peatlands in response to recent warming

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DOI	10.1016/j.quascirev.2019.02.001
	Evidence for ecosystem state shifts in Alaskan continuous permafrost peatlands in response to recent warming
	Taylor L.S.; Swindles G.T.; Morris P.J.; Gałka M.; Green S.M.
发表日期	2019
ISSN	0277-3791
起始页码	134
结束页码	144
卷号	207
英文摘要	Peatlands in continuous permafrost regions represent a globally-important store of organic carbon, the stability of which is thought to be at risk under future climatic warming. To better understand how these ecosystems may change in a warmer future, we use a palaeoenvironmental approach to reconstruct changes in two peatlands near Toolik Lake on Alaska's North Slope (TFS1 and TFS2). We present the first testate amoeba-based reconstructions from peatlands in continuous permafrost, which we use to infer changes in water-table depth and porewater electrical conductivity during the past two millennia. TFS1 likely initiated during a warm period between 0 and 300 CE. Throughout the late-Holocene, both peatlands were minerotrophic fens with low carbon accumulation rates (means of 18.4 and 14.2 g C m −2 yr −1 for cores TFS1 and TFS2 respectively). However, since the end of the Little Ice Age, both fens have undergone a rapid transition towards oligotrophic peatlands, with deeper water tables and increased carbon accumulation rates (means of 59.5 and 48.2 g C m −2 yr −1 for TFS1 and TFS2 respectively). We identify that recent warming has led to these two Alaskan rich fens to transition into poor fens, with greatly enhanced carbon accumulation rates. Our work demonstrates that some Arctic peatlands may become more productive with future regional warming, subsequently increasing their ability to sequester carbon. © 2019 Elsevier Ltd
英文关键词	Arctic; Climate change; Holocene; Hydrology; Reconstruction; Testate amoebae
语种	英语
scopus关键词	Climate change; Ecosystems; Groundwater; Hydrology; Image reconstruction; Organic carbon; Permafrost; Protozoa; Arctic; Carbon accumulation; Electrical conductivity; Holocenes; Permafrost region; Rapid transitions; Testate amoebae; Water table depths; Wetlands; accumulation rate; carbon; climate variation; ecosystem dynamics; electrical conductivity; fen; Holocene; hydrology; Little Ice Age; organic carbon; paleoecology; peatland; permafrost; porewater; reconstruction; warming; water depth; water table; Alaska; Arctic; Toolik Lake; United States
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/152010
作者单位	School of Geography, University of Leeds, Leeds, United Kingdom; Ottawa-Carleton Geoscience Centre and Department of Earth Sciences, Carleton University, Ottawa, Ontario, Canada; Department of Geobotany and Plant Ecology, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom
推荐引用方式 GB/T 7714	Taylor L.S.,Swindles G.T.,Morris P.J.,et al. Evidence for ecosystem state shifts in Alaskan continuous permafrost peatlands in response to recent warming[J],2019,207.
APA	Taylor L.S.,Swindles G.T.,Morris P.J.,Gałka M.,&Green S.M..(2019).Evidence for ecosystem state shifts in Alaskan continuous permafrost peatlands in response to recent warming.Quaternary Science Reviews,207.
MLA	Taylor L.S.,et al."Evidence for ecosystem state shifts in Alaskan continuous permafrost peatlands in response to recent warming".Quaternary Science Reviews 207(2019).