气候变化领域集成服务门户(CCPortal): Boreal permafrost thaw amplified by fire disturbance and precipitation increases

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DOI	10.1088/1748-9326/abbeb8
	Boreal permafrost thaw amplified by fire disturbance and precipitation increases
	Williams M.; Zhang Y.; Estop-Aragonés C.; Fisher J.P.; Xenakis G.; Charman D.J.; Hartley I.P.; Murton J.B.; Phoenix G.K.
发表日期	2020
ISSN	17489318
卷号	15 期号:11
英文摘要	Permafrost soils store huge amounts of organic carbon, which could be released if climate change promotes thaw. Currently, modelling studies predict that thaw in boreal regions is mainly sensitive to warming, rather than changes in precipitation or vegetation cover. We evaluate this conclusion for North American boreal forests using a detailed process-based model parameterised and validated on field measurements. We show that soil thermal regimes for dominant forest types are controlled strongly by soil moisture and thus the balance between evapotranspiration and precipitation. Under dense canopy cover, high evapotranspiration means a 30% increase in precipitation causes less thaw than a 1 C increase in temperature. However, disturbance to vegetation promotes greater thaw through reduced evapotranspiration, which results in wetter, more thermally conductive soils. In such disturbed forests, increases in precipitation rival warming as a direct driver of thaw, with a 30% increase in precipitation at current temperatures causing more thaw than 2 C of warming. We find striking non-linear interactive effects on thaw between rising precipitation and loss of leaf area, which are of concern given projections of greater precipitation and disturbance in boreal forests. Inclusion of robust vegetation-hydrological feedbacks in global models is therefore critical for accurately predicting permafrost dynamics; thaw cannot be considered to be controlled solely by rising temperatures. © 2020 The Author(s). Published by IOP Publishing Ltd.
英文关键词	leaf area index; permafrost; thaw; thermal modelling
语种	英语
scopus关键词	Climate change; Evapotranspiration; Forestry; Organic carbon; Permafrost; Soil moisture; Vegetation; Disturbed forests; Field measurement; Interactive effect; Modelling studies; Permafrost thaws; Process-based modeling; Rising temperatures; Vegetation cover; Thawing
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/153486
作者单位	School of GeoSciences, University of Edinburgh, Edinburgh, United Kingdom; Canada Centre for Mapping and Earth Observation, Natural Resources Canada, Ottawa, Canada; Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, United Kingdom; Ecohydrology and Biogeochemistry Group, Institute of Landscape Ecology, University of Münster, Münster, Germany; Department of Animal and Plant Sciences, University of Sheffield, Western Bank Sheffield, United Kingdom; Forest Research, Roslin, Edinburgh, United Kingdom; Geography, University of Sussex, Brighton, United Kingdom
推荐引用方式 GB/T 7714	Williams M.,Zhang Y.,Estop-Aragonés C.,et al. Boreal permafrost thaw amplified by fire disturbance and precipitation increases[J],2020,15(11).
APA	Williams M..,Zhang Y..,Estop-Aragonés C..,Fisher J.P..,Xenakis G..,...&Phoenix G.K..(2020).Boreal permafrost thaw amplified by fire disturbance and precipitation increases.Environmental Research Letters,15(11).
MLA	Williams M.,et al."Boreal permafrost thaw amplified by fire disturbance and precipitation increases".Environmental Research Letters 15.11(2020).