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Role of mixed-species stands in attenuating the vulnerability of boreal forests to climate change and insect epidemics

Chavardès Raphaël D., Gennaretti Fabio, Grondin Pierre, Cavard Xavier, Morin Hubert et Bergeron Yves. (2021). Role of mixed-species stands in attenuating the vulnerability of boreal forests to climate change and insect epidemics. Frontiers in Plant Science, 12, (e658880), p. 1-12.

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URL officielle: http://dx.doi.org/doi:10.3389/fpls.2021.658880

Résumé

We investigated whether stand species mixture can attenuate the vulnerability of eastern Canada’s boreal forests to climate change and insect epidemics. For this, we focused on two dominant boreal species, black spruce [Picea mariana (Mill.) BSP] and trembling aspen (Populus tremuloides Michx.), in stands dominated by black spruce or trembling aspen (“pure stands”), and mixed stands (M) composed of both species within a 36 km2 study area in the Nord-du-Québec region. For each species in each stand composition type, we tested climate-growth relations and assessed the impacts on growth by recorded insect epidemics of a black spruce defoliator, the spruce budworm (SBW) [Choristoneura fumiferana (Clem.)], and a trembling aspen defoliator, the forest tent caterpillar (FTC; Malacosoma disstria Hübn.). We implemented linear models in a Bayesian framework to explain baseline and long-term trends in tree growth for each species according to stand composition type and to differentiate the influences of climate and insect epidemics on tree growth. Overall, we found climate vulnerability was lower for black spruce in mixed stands than in pure stands, while trembling aspen was less sensitive to climate than spruce, and aspen did not present differences in responses based on stand mixture. We did not find any reduction of vulnerability for mixed stands to insect epidemics in the host species, but the non-host species in mixed stands could respond positively to epidemics affecting the host species, thus contributing to stabilize ecosystem-scale growth over time. Our findings partially support boreal forest management strategies including stand species mixture to foster forests that are resilient to climate change and insect epidemics.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1664-462X
Volume:12
Numéro:e658880
Pages:p. 1-12
Version évaluée par les pairs:Oui
Date:2021
Identifiant unique:10.3389/fpls.2021.658880
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Foresterie et sciences du bois
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:forest tent caterpillar, malacosoma disstria, spruce budworm, choristoneura fumiferana, summer heat stress, growing season length, climate-growth relations, trembling aspen, populus tremuloides, picea mariana, stand mixture
Déposé le:11 mai 2022 19:24
Dernière modification:11 mai 2022 19:24
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