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Vulnerability of conifer regeneration to spruce budworm outbreaks in the Eastern Canadian boreal forest

Lavoie Janie, Montoro Girona Miguel et Morin Hubert. (2019). Vulnerability of conifer regeneration to spruce budworm outbreaks in the Eastern Canadian boreal forest. Forests, 10, (10), p. 1-14.

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URL officielle: http://dx.doi.org/doi:10.3390/f10100850

Résumé

Spruce budworm (Choristoneura fumiferana) is the main defoliator of conifer trees in North American boreal forests, affecting extensive areas and causing marked losses of timber supplies. In 2017, spruce budworm affected more than 7 million ha of Eastern Canadian forest. Defoliation was particularly severe for black spruce (Picea mariana (Mill.) B.S.P.), one of the most important commercial trees in Canada. During the last decades, intensive forest exploitation practices have created vast stands of young balsam fir (Abies balsamea (L.) Mill.) and black spruce. Most research focused on the impacts of spruce budworm has been on mature stands; its effects on regeneration, however, have been neglected. This study evaluates the impacts of spruce budworm on the defoliation of conifer seedlings (black spruce and balsam fir) in clearcuts. We measured the cumulative and annual defoliation of seedlings within six clearcut black spruce stands in Quebec (Canada) that had experienced severe levels of defoliation due to spruce budworm. For all sampled seedlings, we recorded tree species, height class, and distance to the residual forest. Seedling height and species strongly influenced defoliation level. Small seedlings were less affected by spruce budworm activity. As well, cumulative defoliation for balsam fir was double that of black spruce (21% and 9%, respectively). Distance to residual stands had no significant effect on seedling defoliation. As insect outbreaks in boreal forests are expected to become more severe and frequent in the near future, our results are important for adapting forest management strategies to insect outbreaks in a context of climate change.

Type de document:Article publié dans une revue avec comité d'évaluation
ISSN:1999-4907
Volume:10
Numéro:10
Pages:p. 1-14
Version évaluée par les pairs:Oui
Date:2019
Identifiant unique:10.3390/f10100850
Sujets: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:black spruce, balsam fir, clearcut, edge effect, forest damages, forest dynamics, global change, natural disturbances, sustainable forest management, seedlings, Picea mariana, Abies balsamea, coupe, effet de bordure, dynamique, changements climatiques, perturbations naturelles, aménagement forestier durable, semis
Déposé le:05 nov. 2019 22:58
Dernière modification:05 nov. 2019 22:58
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