Abstract
Dendrochronology and tree-ring densitometry are used to reconstruct summer temperatures and treeline dynamics in the Columbia Icefield area from 1600 AD to the present. Detailed studies at three sites, less than 10 km. apart, show different responses to regional climate over this interval. At a north-facing site, Abies lasiocarpa have maintained a population by vegetative regeneration with little change in the treeline ecotone over the last 400 years. In contrast, at a warmer, south-facing site, the Picea engelmannii dominated treeline shows catastrophic dieback during the late 1600s. Extensive upslope migration of treeline by seedling establishment occurred during the 20th Century. At an adjacent valley-floor site, tree clumps established during the 18th–19th centuries but exhibit no subsequent population expansion beyond their borders. These results suggest that the response of treeline ecotones to climate change varies with both local site conditions and the response of individual species. These data can provide important inputs to simulation models and to resource managers who wish to understand the effect of climate change on ecosystem dynamics.
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Luckman, B.H., Kavanagh, T.A. (1998). Documenting the effects of recent climate change at treeline in the canadian rockies. In: Beniston, M., Innes, J.L. (eds) The Impacts of Climate Variability on Forests. Lecture Notes in Earth Sciences, vol 74. Springer, Berlin, Heidelberg. https://doi.org/10.1007/BFb0009770
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