期刊
PERMAFROST AND PERIGLACIAL PROCESSES
卷 22, 期 3, 页码 199-213出版社
WILEY
DOI: 10.1002/ppp.724
关键词
vegetation; discontinuous permafrost; peat plateaus; remote sensing; climate change
资金
- Improved Processes and Parameterisation for Prediction in Cold Regions network
- Canadian Foundation for Climate and Atmospheric Sciences
- Natural Sciences and Engineering Research Council
This study examines the links between the spatial distribution of three-dimensional vegetation structural characteristics and historical permafrost plateau area changes using airborne light detection and ranging and aerial photography. The results show that vegetation is prone to reduced canopy fractional cover (by up to 50%) and reduced canopy heights (by 16-30%) at the edges of plateaus. Reduced biomass may cause a positive feedback, whereby diminished within-and below-canopy shadowing (by 1 h of shadow time per day) results in increased radiation incident on the ground surface (16% greater at open-vs closed-canopy plateau sites) and increased longwave radiation losses (74% greater at open- vs closed-canopy plateau sites). Increased incident shortwave radiation may result in augmented thawing of permafrost and increased meltwater runoff, which further inhibits vegetation and permafrost persistence. Edge influences on ground thaw cause vegetation to die over several years (confirmed using historical aerial photography), thereby exacerbating thaw and plateau area reduction (plateau area reduction =similar to 27% over 60 years). Permafrost degradation is also evidenced by the increasingly fragmented characteristics of the landscape. Copyright (C) 2011 John Wiley & Sons, Ltd.
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