DOI: 10.1016/j.quascirev.2015.05.012
Scopus记录号: 2-s2.0-84930644382
论文题名: Drivers of Holocene peatland carbon accumulation across a climate gradient in northeastern North America
作者: Charman D.J. ; Amesbury M.J. ; Hinchliffe W. ; Hughes P.D.M. ; Mallon G. ; Blake W.H. ; Daley T.J. ; Gallego-Sala A.V. ; Mauquoy D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2015
卷: 121 起始页码: 110
结束页码: 119
语种: 英语
英文关键词: Carbon accumulation
; Climate
; Holocene
; Peatland
; Vegetation
Scopus关键词: Ecosystems
; Groundwater
; Multivariant analysis
; Nitrogen
; Photosynthesis
; Phytoplankton
; Regression analysis
; Vegetation
; Wetlands
; Carbon accumulation
; Carbon sequestration
; Climate
; Environmental variables
; Holocenes
; Multivariate regression analysis
; Net primary productivity
; Peatland
; Climate change
; accumulation
; carbon sequestration
; climate change
; Holocene
; net primary production
; peatland
; raised bog
; North America
英文摘要: Peatlands are an important component of the Holocene global carbon (C) cycle and the rate of C sequestration and storage is driven by the balance between net primary productivity and decay. A number of studies now suggest that climate is a key driver of peatland C accumulation at large spatial scales and over long timescales, with warmer conditions associated with higher rates of C accumulation. However, other factors are also likely to play a significant role in determining local carbon accumulation rates and these may modify past, present and future peatland carbon sequestration. Here, we test the importance of climate as a driver of C accumulation, compared with hydrological change, fire, nitrogen content and vegetation type, from records of C accumulation at three sites in northeastern North America, across the N-S climate gradient of raised bog distribution. Radiocarbon age models, bulk density values and %C measurements from each site are used to construct C accumulation histories commencing between 11,200 and 8000cal. years BP. The relationship between C accumulation and environmental variables (past water table depth, fire, peat forming vegetation and nitrogen content) is assessed with linear and multivariate regression analyses. Differences in long-term rates of carbon accumulation between sites support the contention that a warmer climate with longer growing seasons results in faster rates of long-term carbon accumulation. However, mid-late Holocene accumulation rates show divergent trends, decreasing in the north but rising in the south. We hypothesise that sites close to the moisture threshold for raised bog distribution increased their growth rate in response to a cooler climate with lower evapotranspiration in the late Holocene, but net primary productivity declined over the same period in northern areas causing a decrease in C accumulation. There was no clear relationship between C accumulation and hydrological change, vegetation, nitrogen content or fire, but early successional stages of peatland growth had faster rates of C accumulation even though temperatures were probably lower at the time. We conclude that climate is the most important driver of peatland accumulation rates over millennial timescales, but that successional vegetation change is a significant additional influence. Whilst the majority of northern peatlands are likely to increase C accumulation rates under future warmer climates, those at the southern limit of distribution may show reduced rates. However, early succession peatlands that develop under future warming at the northern limits of peatland distribution are likely to have high rates of C accumulation and will compensate for some of the losses elsewhere. © 2015 The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59900
Appears in Collections: 过去全球变化的重建
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作者单位: Geography, College of Life and Environmental Sciences, University of Exeter, Amory Building, Rennes Drive, Exeter, United Kingdom; Geography and Environment, University of Southampton, University Road, Highfield, Southampton, Hampshire, United Kingdom; Department of Geography, University of Sheffield, Sheffield, United Kingdom; School of Geography, Earth and Environmental Sciences, Plymouth University, Drake Circus, Plymouth, Devon, United Kingdom; School of Geosciences, University of Aberdeen, St. Mary's Building, Elphinstone Road, Aberdeen, United Kingdom
Recommended Citation:
Charman D.J.,Amesbury M.J.,Hinchliffe W.,et al. Drivers of Holocene peatland carbon accumulation across a climate gradient in northeastern North America[J]. Quaternary Science Reviews,2015-01-01,121