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Spatially explicit fire-climate history of the boreal forest-tundra (Eastern Canada) over the last 2000 years

Content Provider	Paperity
Author	Delwaide, Ann Payette, Serge Filion, Louise
Abstract	Across the boreal forest, fire is the main disturbance factor and driver of ecosystem changes. In this study, we reconstructed a long-term, spatially explicit fire history of a forest-tundra region in northeastern Canada. We hypothesized that current occupation of similar topographic and edaphic sites by tundra and forest was the consequence of cumulative regression with time of forest cover due to compounding fire and climate disturbances. All fires were mapped and dated per 100 year intervals over the last 2000 years using several fire dating techniques. Past fire occurrences and post-fire regeneration at the northern forest limit indicate 70% reduction of forest cover since 1800â€Šyr BP and nearly complete cessation of forest regeneration since 900â€Šyr BP. Regression of forest cover was particularly important between 1500sâ€“1700s and possibly since 900â€Šyr BP. Although fire frequency was very low over the last 100 years, each fire event was followed by drastic removal of spruce cover. Contrary to widespread belief of northward boreal forest expansion due to recent warming, lack of post-fire recovery during the last centuries, in comparison with active tree regeneration more than 1000 years ago, indicates that the current climate does not favour such expansion.
Starting Page	2299
Ending Page	2314
File Format	HTM / HTML
ISSN	09628436
DOI	10.1098/rstb.2007.2201
Issue Number	1501
Journal	Philosophical Transactions of the Royal Society B: Biological Sciences
Volume Number	363
e-ISSN	14712970
Language	English
Publisher	Royal Society Publishing
Publisher Date	2008-07-12
Access Restriction	Open
Subject Keyword	Fire history Boreal forest Climate change Environmental science Forest tundra Fire Ecology Subarctic
Content Type	Text
Resource Type	Article
Subject	Biochemistry, Genetics and Molecular Biology Agricultural and Biological Sciences

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