气候变化领域集成服务门户(CCPortal): Carbon dioxide emissions from periglacial patterned ground under changing permafrost conditions and shrub encroachment in an alpine landscape; Jotunheimen; Norway

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DOI	10.1002/ppp.2078
	Carbon dioxide emissions from periglacial patterned ground under changing permafrost conditions and shrub encroachment in an alpine landscape; Jotunheimen; Norway
	Hallang H.; Hiemstra J.F.; Los S.O.; Matthews J.A.; Froyd C.A.
发表日期	2020
ISSN	10456740
起始页码	524
结束页码	537
卷号	31 期号:4
英文摘要	Whether Arctic and alpine ecosystems will act as a future net sink or source of carbon remains uncertain. The present study investigates ways in which ecosystem (soil and vegetation) and geomorphological (cryogenic disturbance) factors may control or affect the future release of carbon in an alpine permafrost landscape. Rates of ecosystem respiration (Re) were examined using a portable gas analyzer across an altitudinal transect ranging from mid- to high-alpine vegetation zones underlain by discontinuous to continuous permafrost on Galdhøpiggen (Norway). Measurements were made of Re during the peak growing season on active and relict sorted circles exhibiting varying levels of frost disturbance and shrub encroachment. Re was found to be controlled more strongly by soil microclimate and plant growth forms than by geomorphic indicators of cryoturbation in thawing permafrost or by atmospheric conditions. The results indicate that increasing shrub cover leads to elevated Re, while an increase in surface disturbance has the potential to lower Re. We conclude that vegetation is likely to colonize frost-disturbed surfaces at progressively higher altitudes as freeze–thaw processes slow down or cease, and this will result in increased Re. © 2020 John Wiley & Sons, Ltd.
英文关键词	alpine permafrost; CO2 emissions; cryoturbation; shrubification
scopus关键词	alpine environment; carbon dioxide; carbon emission; cryoturbation; freeze-thaw cycle; patterned ground; periglacial environment; permafrost; respiration; shrub; terrestrial ecosystem; vegetation cover; Jotunheimen; Norway
来源期刊	Permafrost and Periglacial Processes
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/176786
作者单位	Department of Geography, College of Science, Swansea University, Swansea, Wales, United Kingdom; Department of Biosciences, College of Science, Swansea University, Swansea, Wales, United Kingdom
推荐引用方式 GB/T 7714	Hallang H.,Hiemstra J.F.,Los S.O.,et al. Carbon dioxide emissions from periglacial patterned ground under changing permafrost conditions and shrub encroachment in an alpine landscape; Jotunheimen; Norway[J],2020,31(4).
APA	Hallang H.,Hiemstra J.F.,Los S.O.,Matthews J.A.,&Froyd C.A..(2020).Carbon dioxide emissions from periglacial patterned ground under changing permafrost conditions and shrub encroachment in an alpine landscape; Jotunheimen; Norway.Permafrost and Periglacial Processes,31(4).
MLA	Hallang H.,et al."Carbon dioxide emissions from periglacial patterned ground under changing permafrost conditions and shrub encroachment in an alpine landscape; Jotunheimen; Norway".Permafrost and Periglacial Processes 31.4(2020).