globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13583
论文题名:
Holocene carbon dynamics at the forest–steppe ecotone of southern Siberia
作者: Mackay A.W.; Seddon A.W.R.; Leng M.J.; Heumann G.; Morley D.W.; Piotrowska N.; Rioual P.; Roberts S.; Swann G.E.A.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:5
起始页码: 1942
结束页码: 1960
语种: 英语
英文关键词: abrupt climate change ; carbon ; forest–steppe ecotone ; Holocene ; Lake Baikal ; palaeolimnology ; permafrost
Scopus关键词: Bacillariophyta
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 (δ13CTOC). 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 least-squares 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. © 2016 John Wiley & Sons Ltd
资助项目: We wish to acknowledge the various agencies who helped to fund this work, especially UK NERC (IP/635/0300 ; NE/J010227/1), the EU FPV programme (EVK2-CT-2000-0057) and the Norwegian Research Council (IGNEX ref: 249894/F20). We thank Dr Alexander Prokopenko for providing the TOC data from the Buguldieka Saddle, used in Fig. S4B. We thank UCL Geography Cartography Unit who helped prepared the figures and David Adger and two anonymous reviews for very insightful comments which have helped to improve the manuscript considerably.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60972
Appears in Collections:影响、适应和脆弱性

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作者单位: Environmental Change Research Centre, Department of Geography, UCL, London, United Kingdom; Department of Biology and Bjerknes Centre for Climate Research, University of Bergen, PO Box 7803, Bergen, Norway; NERC Isotope Geosciences Facilities, British Geological Survey, Nottingham, United Kingdom; Centre for Environmental Geochemistry, University of Nottingham, Nottingham, United Kingdom; Steinmann Institute of Geology, Mineralogy and Paleontology, University of Bonn, Nussallee 8, Bonn, Germany; Department of Radioisotopes, Institute of Physics – CSE, Silesian University of Technology, Konarskiego 22B, Gliwice, Poland; Key Laboratory of Cenozoic Geology and Environment, Institute of Geology and Geophysics, Chinese Academy of Sciences, PO Box 9825, Beijing, China; School of Geography, University of Nottingham, University Park, Nottingham, United Kingdom

Recommended Citation:
Mackay A.W.,Seddon A.W.R.,Leng M.J.,et al. Holocene carbon dynamics at the forest–steppe ecotone of southern Siberia[J]. Global Change Biology,2017-01-01,23(5)
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