The rapid expansion of Populus tremuloides due to anthropogenic disturbances in eastern Canada

Author:

Marchais Mathilde1,Arseneault Dominique2,Bergeron Yves3

Affiliation:

1. Institut de recherche sur les forêts, Université du Québec en Abitibi-Témiscamingue, Rouyn-Noranda, QC J9X 5E4, Canada

2. Département de biologie, chimie et géographie, Université du Québec à Rimouski, Rimouski, QC G5L 3A1, Canada

3. Département des sciences biologiques, Université du Québec à Montréal, Montréal, QC H2X 1Y4, Canada

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.

Funder

Rayonier Advanced Materials

Natural Sciences and Engineering Research Council of Canada

Fonds de Recherche du Québec Nature et Technologies

The Lake Duparquet Research and Teaching Forest

Publisher

Canadian Science Publishing

Subject

Ecology,Forestry,Global and Planetary Change

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