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The rapid expansion of Populus tremuloides due to anthropogenic disturbances in eastern Canada.
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- Author(s): Marchais, Mathilde ; Arseneault, Dominique; Bergeron, Yves
- Source:
Canadian Journal of Forest Research. 2022, Vol. 52 Issue 7, p991-1001. 11p.- Subject Terms:
- Source:
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- Subject Terms:
- Abstract: In the context of global changes, the future dynamics of trembling aspen (Populus tremuloides Michx.) are uncertain in the middle of its range. An increase in climate-related mortality could occur, but the modification of disturbance regimes could also favor its expansion. In this study, we document trembling aspen dynamics over 40 years at the scale of a boreal forest landscape (10 930 km²), as well as the role of disturbances in these dynamics. The results indicate that trembling aspen has experienced a substantial expansion over the last four decades (+102% occurrence), particularly between 1987 and 1997 (+70.9% occurrence). Nevertheless, these dynamics vary both spatially and temporally, with for example a phase of weak decline since 1997 (−5.9% occurrence). Anthropogenic disturbances, particularly clear-cutting, have played a major role in the expansion of trembling aspen. This expansion could influence the response of ecosystems to climate change, by modifying both fire and insect outbreak activities. [ABSTRACT FROM AUTHOR]
- Abstract: Dans le contexte des changements mondiaux, la dynamique future du peuplier faux-tremble (Populus tremuloides Michx.) est incertaine au milieu de son aire de distribution. Une augmentation de la mortalité reliée au climat pourrait se produire, mais la modification des régimes de perturbations pourrait également favoriser son expansion. Dans la présente étude, nous documentons la dynamique du peuplier faux-tremble sur plus de 40 ans à l'échelle d'un paysage forestier boréal (10 930 km²) de même que le rôle des perturbations dans cette dynamique. Les résultats indiquent que le peuplier faux-tremble a connu une expansion substantielle au cours des quatre dernières décennies (fréquence de +102 %), particulièrement entre 1987 et 1997 (fréquence de +70,9 %). Néanmoins, cette dynamique varie sur le plan spatial et temporel, avec par exemple une phase de faible déclin depuis 1997 (fréquence de −5,9 %). Les perturbations anthropogéniques, particulièrement la coupe à blanc, ont joué un rôle majeur dans l'expansion du peuplier faux-tremble. Cette expansion pourrait influencer la réponse des écosystèmes aux changements climatiques en modifiant les activités des incendies et des épidémies d'insectes. [Traduit par la Rédaction] [ABSTRACT FROM AUTHOR]
- Abstract: Copyright of Canadian Journal of Forest Research is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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