DOI: 10.1016/j.quascirev.2019.02.001
Scopus记录号: 2-s2.0-85061434260
论文题名: Evidence for ecosystem state shifts in Alaskan continuous permafrost peatlands in response to recent warming
作者: Taylor L.S. ; Swindles G.T. ; Morris P.J. ; Gałka M. ; Green S.M.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2019
卷: 207 起始页码: 134
结束页码: 144
语种: 英语
英文关键词: Arctic
; Climate change
; Holocene
; Hydrology
; Reconstruction
; Testate amoebae
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
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 Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117372
Appears in Collections: 气候变化与战略
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Recommended Citation:
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]. Quaternary Science Reviews,2019-01-01,207