Holocene carbon dynamics at the forest-steppe ecotone of southern Siberia

doi:10.1111/gcb.13583

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院新生代地质与环境重点实验室

	Holocene carbon dynamics at the forest-steppe ecotone of southern Siberia
	Mackay, Anson William 1; Seddon, Alistair W. R.2,3; Leng, Melanie J.4,5; Heumann, Georg 6; Morley, David W.1; Piotrowska, Natalia 7; Rioual, Patrick 8; Roberts, Sarah 9; Swann, George E. A.9
刊名	GLOBAL CHANGE BIOLOGY
	2017-05-01
卷号	23 期号:5 页码:1942-1960
关键词	Abrupt Climate Change Carbon Forest-steppe Ecotone Holocene Lake Baikal Palaeolimnology Permafrost
ISSN号	1354-1013
DOI	10.1111/gcb.13583
文献子类	Article
英文摘要	The forest-steppe ecotone in southern Siberia is highly sensitive to climate change; global warming is expected to push the ecotone northwards, at the same time resulting in degradation of the underlying permafrost. To gain a deeper understanding of long-term forest-steppe carbon dynamics, we use a highly resolved, multiproxy, palaeolimnological approach, based on sediment records from Lake Baikal. We reconstruct proxies that are relevant to understanding carbon dynamics including carbon mass accumulation rates (CMAR; g C m(-2) yr(-1)) and isotope composition of organic matter (delta C-13(TOC)). Forest-steppe dynamics were reconstructed using pollen, and diatom records provided measures of primary production from near-and off-shore communities. We used a generalized additive model (GAM) to identify significant change points in temporal series, and by applying generalized linear leastsquares regression modelling to components of the multiproxy data, we address (1) What factors influence carbon dynamics during early Holocene warming and late Holocene cooling? (2) How did carbon dynamics respond to abrupt sub-Milankovitch scale events? and (3) What is the Holocene carbon storage budget for Lake Baikal. CMAR values range between 2.8 and 12.5 g C m(-2) yr(-1). Peak burial rates (and greatest variability) occurred during the early Holocene, associated with melting permafrost and retreating glaciers, while lowest burial rates occurred during the neoglacial. Significant shifts in carbon dynamics at 10.3, 4.1 and 2.8 kyr BP provide compelling evidence for the sensitivity of the region to sub-Milankovitch drivers of climate change. We estimate that 1.03 Pg C was buried in Lake Baikal sediments during the Holocene, almost one-quarter of which was buried during the early Holocene alone. Combined, our results highlight the importance of understanding the close linkages between carbon cycling and hydrological processes, not just temperatures, in southern Siberian environments.
WOS关键词	STABLE-ISOTOPE ANALYSES ; NORTH-ATLANTIC CLIMATE ; LAST GLACIAL MAXIMUM ; LAKE BAIKAL ; ICE-CORE ; HIGH-RESOLUTION ; CENTRAL-ASIA ; LATE QUATERNARY ; PREBOREAL OSCILLATION ; ENVIRONMENTAL-CHANGES
WOS研究方向	Biodiversity & Conservation ; Environmental Sciences & Ecology
语种	英语
出版者	WILEY
WOS记录号	WOS:000397800600016
资助机构	UK NERC(IP/635/0300 ; EU FPV programme(EVK2-CT-2000-0057) ; Norwegian Research Council (IGNEX)(249894/F20) ; NE/J010227/1) ; UK NERC(IP/635/0300 ; EU FPV programme(EVK2-CT-2000-0057) ; Norwegian Research Council (IGNEX)(249894/F20) ; NE/J010227/1) ; UK NERC(IP/635/0300 ; EU FPV programme(EVK2-CT-2000-0057) ; Norwegian Research Council (IGNEX)(249894/F20) ; NE/J010227/1) ; UK NERC(IP/635/0300 ; EU FPV programme(EVK2-CT-2000-0057) ; Norwegian Research Council (IGNEX)(249894/F20) ; NE/J010227/1)
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/53005]
专题	地质与地球物理研究所_中国科学院新生代地质与环境重点实验室
通讯作者	Mackay, Anson William
作者单位	1.UCL, Dept Geog, Environm Change Res Ctr, London WC1E 6BT, England 2.Univ Bergen, Dept Biol, POB 7803, N-5020 Bergen, Norway 3.Univ Bergen, Bjerknes Ctr Climate Res, POB 7803, N-5020 Bergen, Norway 4.British Geol Survey, NERC Isotope Geosci Facil, Nottingham NG12 5GG, England 5.Univ Nottingham, Ctr Environm Geochem, Nottingham NG7 2RD, England 6.Univ Bonn, Steinmann Inst Geol Mineral & Paleontol, Nussallee 8, D-53115 Bonn, Germany 7.Silesian Tech Univ, Dept Radioisotopes, Inst Phys CSE, Konarskiego 22B, PL-44100 Gliwice, Poland 8.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Cenozo Geol & Environm, POB 9825, Beijing 100029, Peoples R China 9.Univ Nottingham, Sch Geog, Univ Pk, Nottingham NG7 2RD, England
推荐引用方式 GB/T 7714	Mackay, Anson William,Seddon, Alistair W. R.,Leng, Melanie J.,et al. Holocene carbon dynamics at the forest-steppe ecotone of southern Siberia[J]. GLOBAL CHANGE BIOLOGY,2017,23(5):1942-1960.
APA	Mackay, Anson William.,Seddon, Alistair W. R..,Leng, Melanie J..,Heumann, Georg.,Morley, David W..,...&Swann, George E. A..(2017).Holocene carbon dynamics at the forest-steppe ecotone of southern Siberia.GLOBAL CHANGE BIOLOGY,23(5),1942-1960.
MLA	Mackay, Anson William,et al."Holocene carbon dynamics at the forest-steppe ecotone of southern Siberia".GLOBAL CHANGE BIOLOGY 23.5(2017):1942-1960.