Abstract
Old-growth boreal forest is considered rare since large fires or insect disturbances occur too frequently to allow forest stands to reach old ages. Recent research on historical fire regimes in the circumboreal region have shown that this assertion is false for several reasons. First, fire frequency varies greatly among regions and natural fire cycles are often longer than the normal lifespan of the trees, especially in northeastern Canada, allowing stands of fire-adapted species to be replaced by self-maintaining late successional species. Second, even in landscapes characterised by short fire intervals, the stochastic occurrence of fires allows some parts of the landscape to escape fire for long periods. Old-growth boreal forests possess compositional, structural and functional characteristics, such as a legacy of deadwood and greater structural diversity, that differ significantly from those of post-fire forests. Current forestry practices in boreal forests only partly emulate natural stand dynamics and lead to an important decrease in the proportion of old-growth forests.
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Bergeron, Y., Harper, K.A. (2009). Old-Growth Forests in the Canadian Boreal: the Exception Rather than the Rule?. In: Wirth, C., Gleixner, G., Heimann, M. (eds) Old-Growth Forests. Ecological Studies, vol 207. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-92706-8_13
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