Long-term dynamics of fire refuges in boreal mixedwood forests

Autor: Ouarmim, Samira, Asselin, Hugo, Hély, Christelle, Bergeron, Yves, Ali, Adam
Přispěvatelé: Chaire de recherche industrielle CRSNG [Canada], Université Laval en Sylviculture et Faune, Université du Québec en Abitibi-Témiscamingue (UQAT), Centre de Bio-Archéologie et d'Ecologie (CBAE), Centre National de la Recherche Scientifique (CNRS)-École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université Montpellier 2 - Sciences et Techniques (UM2), Institut des Sciences de l'Evolution de Montpellier (UMR ISEM), École pratique des hautes études (EPHE), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Université de Montpellier (UM)-Centre de Coopération Internationale en Recherche Agronomique pour le Développement (Cirad)-Centre National de la Recherche Scientifique (CNRS)-Institut de recherche pour le développement [IRD] : UR226, Université du Québec à Montréal = University of Québec in Montréal (UQAM)
Jazyk: angličtina
Rok vydání: 2014
Předmět:
Zdroj: Journal of Quaternary Science
Journal of Quaternary Science, Wiley, 2014, 29 (2), pp.123-129. ⟨10.1002/jqs.2685⟩
ISSN: 0267-8179
1099-1417
DOI: 10.1002/jqs.2685⟩
Popis: International audience; Burned areas in boreal mixedwood forests usually include tree patches that partially or entirely escaped fire. Some of these post-fire residual stands-called fire refuges-can escape several consecutive fires due to particular microsite conditions. Despite their potential importance as biodiversity hotspots, the long-term forest dynamics of fire refuges is unknown. High-resolution analysis of plant macroremains retrieved from forest organic matter profiles sampled in five fire refuges allowed us to describe up to 8000 years of forest dynamics. Our results display the importance of local conditions in forest dynamics. Wildfire was probably prevented by high moisture, as indicated by the presence of aquatic taxa and moisture-tolerant tree species. Lack of stand-replacing fire, coupled with organic matter accumulation, favored the millennial persistence of late-successional tree species. Shifts from spruce/larch dominance to fir/cedar dominance were noted at different occasions during the Holocene, probably resulting from endogenous processes.
Databáze: OpenAIRE
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