气候变化领域集成服务门户(CCPortal): Ecological response of a glacier-fed peatland to late Holocene climate and glacier changes on subantarctic South Georgia

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DOI	10.1016/j.quascirev.2020.106679
	Ecological response of a glacier-fed peatland to late Holocene climate and glacier changes on subantarctic South Georgia
	Xia Z.; Oppedal L.T.; Van der Putten N.; Bakke J.; Yu Z.
发表日期	2020
ISSN	0277-3791
卷号	250
英文摘要	Sedimentary deposits from glacier-fed peatlands provide records of past glacier variability, but the dynamics of these peat-forming ecosystems have rarely been investigated. Through multi-proxy analyses of a 204-cm peat core, we reconstructed the ecological response of a glacier-fed peatland on subantarctic South Georgia to climate and glacier variability over the last 4300 years. A stable peatland with rapid carbon accumulations and dynamic turnovers between brown mosses and monocots persisted between 4300 and 2550 cal yr BP when the up-valley cirque glacier was small under a regional hypsithermal climate. Carbon accumulation rates showed two peak periods driven by climate warming, reaching 140 g C m−2 yr−1 at 4000–3500 cal yr BP and 70 g C m−2 yr−1 at 3200–2700 cal yr BP. Paired δ13C and δ18O data from brown moss cellulose reveal several intervals of glacial meltwater inundation that caused short-term disturbances of the peatland vegetation, indicating that glacial meltwater potentially still affected the peatland ecosystem during this warm period. Moss-dominated vegetation was disrupted and peatland carbon accumulation rates decreased to 15 g C m−2 yr−1 after around 2550 cal yr BP when a cooling-driven glacier advance shifted the erosion and meltwater regime enhancing the glacial sediment influx onto the peatland. Although this enhanced regime of meltwater disturbance has continued since this transition, the brown moss habitat was gradually re-established during the medieval climate warming between 1200 and 600 cal yr BP and then became dominant shortly after that. This re-establishment of brown mosses might have benefited from a period of increased carbon accumulation rates up to 100 g C m−2 yr−1 at 1200–900 cal yr BP that built up the organic matter matrix and stabilized the habitat. We conclude that the ecosystem dynamics of glacier-fed peatlands is strongly shaped by the interplay between regional climate and glacier activity. This study also demonstrates the potential of stable isotope analysis in studying the paleohydrology of non-Sphagnum peatlands. © 2020 Elsevier Ltd
英文关键词	Brown mosses; Glaciers; Late Holocene; Meltwater; Peatlands; South Georgia; Stable isotopes
语种	英语
scopus关键词	Carbon; Ecosystems; Glacial geology; Peat; Vegetation; Carbon accumulation; Ecological response; Ecosystem dynamics; Multi-proxy analysis; Peatland ecosystems; Peatland vegetation; Sedimentary deposits; Stable-isotope analysis; Wetlands; cellulose; ecosystem dynamics; glacial deposit; glacier advance; Holocene; meltwater; moss; organic matter; paleohydrology; regional climate; stable isotope; Antarctica; South Georgia; Bryophyta; Liliopsida; Sphagnum
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/151226
作者单位	Department of Earth and Environmental Sciences, Lehigh University, Bethlehem, PA, United States; Department of Earth Science and Bjerknes Centre for Climate Research, University of Bergen, Bergen, Norway; Department of Earth Sciences, Vrije Universiteit Amsterdam, Amsterdam, Netherlands; Institute for Peat and Mire Research, School of Geographical Sciences, Northeast Normal University, Changchun, China
推荐引用方式 GB/T 7714	Xia Z.,Oppedal L.T.,Van der Putten N.,et al. Ecological response of a glacier-fed peatland to late Holocene climate and glacier changes on subantarctic South Georgia[J],2020,250.
APA	Xia Z.,Oppedal L.T.,Van der Putten N.,Bakke J.,&Yu Z..(2020).Ecological response of a glacier-fed peatland to late Holocene climate and glacier changes on subantarctic South Georgia.Quaternary Science Reviews,250.
MLA	Xia Z.,et al."Ecological response of a glacier-fed peatland to late Holocene climate and glacier changes on subantarctic South Georgia".Quaternary Science Reviews 250(2020).