globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13248
论文题名:
The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest
作者: Fisher J.P.; Estop-Aragonés C.; Thierry A.; Charman D.J.; Wolfe S.A.; Hartley I.P.; Murton J.B.; Williams M.; Phoenix G.K.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:9
起始页码: 3127
结束页码: 3140
语种: 英语
英文关键词: active-layer thickness ; boreal forest ; discontinuous zone ; Northwest Territories ; permafrost ; structural equation modelling
Scopus关键词: active layer ; boreal forest ; climate feedback ; numerical model ; permafrost ; soil moisture ; vegetation ; Canada ; Northwest Territories ; Betula papyrifera ; Bryophyta ; Picea mariana
英文摘要: Carbon release from thawing permafrost soils could significantly exacerbate global warming as the active-layer deepens, exposing more carbon to decay. Plant community and soil properties provide a major control on this by influencing the maximum depth of thaw each summer (active-layer thickness; ALT), but a quantitative understanding of the relative importance of plant and soil characteristics, and their interactions in determine ALTs, is currently lacking. To address this, we undertook an extensive survey of multiple vegetation and edaphic characteristics and ALTs across multiple plots in four field sites within boreal forest in the discontinuous permafrost zone (NWT, Canada). Our sites included mature black spruce, burned black spruce and paper birch, allowing us to determine vegetation and edaphic drivers that emerge as the most important and broadly applicable across these key vegetation and disturbance gradients, as well as providing insight into site-specific differences. Across sites, the most important vegetation characteristics limiting thaw (shallower ALTs) were tree leaf area index (LAI), moss layer thickness and understory LAI in that order. Thicker soil organic layers also reduced ALTs, though were less influential than moss thickness. Surface moisture (0–6 cm) promoted increased ALTs, whereas deeper soil moisture (11–16 cm) acted to modify the impact of the vegetation, in particular increasing the importance of understory or tree canopy shading in reducing thaw. These direct and indirect effects of moisture indicate that future changes in precipitation and evapotranspiration may have large influences on ALTs. Our work also suggests that forest fires cause greater ALTs by simultaneously decreasing multiple ecosystem characteristics which otherwise protect permafrost. Given that vegetation and edaphic characteristics have such clear and large influences on ALTs, our data provide a key benchmark against which to evaluate process models used to predict future impacts of climate warming on permafrost degradation and subsequent feedback to climate. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.
资助项目: We would like to thank Rachael Treharne (University of Sheffield, UK) and Mark Cooper (University of Exeter, UK) for assistance in the field. We also thank Steve Kokelj (NWT Geological Survey, Canada) for insightful discussions and help with site selection, Peter Morse (Geological Survey of Canada) for helpful comments on our manuscript and Aurora Geosciences for logistical support. We also thank the anonymous referees for helpful comments on earlier versions of the manuscript. This work was funded by NERC through grant NE/K00025X/1 to GKP, NE/K000179/1 to IPH, NE/K000241/1 to JM and NE/K000292/1 to MW and a University of Sheffield Righ Foundation Studentship to RT.
Citation statistics:
被引频次[WOS]:127   [查看WOS记录]     [查看WOS中相关记录]
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61303
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Animal and Plant Sciences, University of Sheffield, Western Bank, Sheffield, United Kingdom; Geography, College of Life and Environmental Science, University of Exeter, Exeter, United Kingdom; School of GeoSciences, University of Edinburgh, Kings Buildings, Edinburgh, United Kingdom; Geological Survey of Canada, Natural Resources Canada, Ottawa, ON, Canada; Department of Geography, University of Sussex, Brighton, United Kingdom

Recommended Citation:
Fisher J.P.,Estop-Aragonés C.,Thierry A.,et al. The influence of vegetation and soil characteristics on active-layer thickness of permafrost soils in boreal forest[J]. Global Change Biology,2016-01-01,22(9)
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