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Climate-related changes in peatland carbon accumulation during the last millennium
Charman D. J.; Beilman D. W.; Blaauw M.; Booth R. K.; Brewer S.; Chambers F. M.; Christen J. A.; Gallego-Sala A.; Harrison S. P.; Hughes P. D. M.; Jackson S. T.; Korhola A.; Mauquoy D.; Mitchell F. J. G.; Prentice I. C.; Van Der Linden M.; De Vleeschouwer F.; Yu Z. C.; Alm J.; Bauer I. E.; Corish Y. M. C.; Garneau M.; Hohl V.; Huang Y.; Karofeld E.; Le Roux G.; Loisel J.; Moschen R.; Nichols J. E.; Nieminen T. M.; Macdonald G. M.; Phadtare N. R.; Rausch N.; Sillasoo U.; Swindles G. T.; Tuittila E. S.; Ukonmaanaho L.; Valiranta M.; Van Bellen S.; Van Geel B.; Vitt D. H.; Zhao Y.
出处Biogeosciences
2013
10
2
929-944
关键词Organic-matter Accumulation Late-holocene Environmental-change Western Canada Stable Carbon Human Impact Bog Growth Ice-age Cycle Model
英文摘要Peatlands are a major terrestrial carbon store and a persistent natural carbon sink during the Holocene, but there is considerable uncertainty over the fate of peatland carbon in a changing climate. It is generally assumed that higher temperatures will increase peat decay, causing a positive feedback to climate warming and contributing to the global positive carbon cycle feedback. Here we use a new extensive database of peat profiles across northern high latitudes to examine spatial and temporal patterns of carbon accumulation over the past millennium. Opposite to expectations, our results indicate a small negative carbon cycle feedback from past changes in the long-term accumulation rates of northern peatlands. Total carbon accumulated over the last 1000 yr is linearly related to contemporary growing season length and photosynthetically active radiation, suggesting that variability in net primary productivity is more important than decomposition in determining long-term carbon accumulation. Furthermore, northern peatland carbon sequestration rate declined over the climate transition from the Medieval Climate Anomaly (MCA) to the Little Ice Age (LIA), probably because of lower LIA temperatures combined with increased cloudiness suppressing net primary productivity. Other factors including changing moisture status, peatland distribution, fire, nitrogen deposition, permafrost thaw and methane emissions will also influence future peatland carbon cycle feedbacks, but our data suggest that the carbon sequestration rate could increase over many areas of northern peatlands in a warmer future.
收录类别SCI
语种英语
ISSN号1726-4170
引用统计
文献类型SCI/SSCI论文
条目标识符http://ir.igsnrr.ac.cn/handle/311030/30639
专题历年回溯文献
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GB/T 7714
Charman D. J.,Beilman D. W.,Blaauw M.,et al. Climate-related changes in peatland carbon accumulation during the last millennium. 2013.
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