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Does the type of silvicultural practice influence spruce budworm defoliation of seedlings?

Lavoie, Janie and Montoro Girona, Miguel and Grosbois, Guillaume and Morin, Hubert (2021). Does the type of silvicultural practice influence spruce budworm defoliation of seedlings? Ecosphere. 12 , e03506
[Research article]

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Abstract

Spruce budworm (Choristoneura fumiferana (Clem)) is the main defoliator in the boreal forest of North America, and its outbreaks have major ecological and economic consequences and represent a challenge for forest management. Numerous studies have addressed the effects of this defoliator on mature trees, whereas the effects of spruce budworm on regeneration remain elusive. Furthermore, intensive exploitation practices during the last decades have left a large area of the Canadian boreal forest in an early development stage. In this context, it becomes vital to understand those factors affecting the severity of spruce budworm-related defoliation on regeneration. Here, we determine the defoliation severity of black spruce and balsam fir seedlings in both mature pure black spruce and black spruce-balsam fir stands subjected to two different silvicultural treatments (clear-cutting and partial cutting). Defoliation intensity varied between stand types, silvicultural treatments, species, and height classes. Seedlings in black spruce-balsam fir stands experienced twice the defoliation of those in pure black spruce stands (black spruce seedlings 10% vs. 23%; balsam fir seedlings 29% vs. 47%, respectively). Harvesting methods also influenced seedling defoliation. Under clear-cutting, black spruce seedlings (24%) were three times as defoliated as black spruce seedlings in partial cutting stands (8%), whereas balsam fir seedlings in clear-cutting plots experienced twice the defoliation (42%) of balsam fir seedlings in partial cutting plots (20%). The level of defoliation also increased with seedling height. This study will help silvicultural strategies adapt to the effects of natural disturbance regimes. As the intensity and severity of defoliator outbreaks are expected to increase under climate change, these results will help guide forest management strategies to select harvesting methods that will limit the effects of defoliation on conifer regeneration.

Authors/Creators:Lavoie, Janie and Montoro Girona, Miguel and Grosbois, Guillaume and Morin, Hubert
Title:Does the type of silvicultural practice influence spruce budworm defoliation of seedlings?
Series Name/Journal:Ecosphere
Year of publishing :2021
Volume:12
Article number:e03506
Number of Pages:17
Publisher:WILEY
ISSN:2150-8925
Language:English
Publication Type:Research article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 106 Biological Sciences (Medical to be 3 and Agricultural to be 4) > Ecology
Keywords:balsam fir, black spruce, boreal forest, clear‐cut, forest damages, global change, insect outbreaks, natural disturbances, partial cuttings, seedlings, silviculture, sustainable forest management
URN:NBN:urn:nbn:se:slu:epsilon-p-112074
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-112074
Additional ID:
Type of IDID
DOI10.1002/ecs2.3506
Web of Science (WoS)000645597500001
ID Code:24379
Faculty:S - Faculty of Forest Sciences
NJ - Fakulteten för naturresurser och jordbruksvetenskap
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
(NL, NJ) > Dept. of Aquatic Sciences and Assessment
Deposited By: SLUpub Connector
Deposited On:03 Jun 2021 11:43
Metadata Last Modified:03 Jun 2021 11:51

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