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Driving factors of conifer regeneration dynamics in eastern Canadian boreal old-growth forests

Martin, Maxence and Montoro Girona, Miguel and Morin, Hubert (2020). Driving factors of conifer regeneration dynamics in eastern Canadian boreal old-growth forests. PLoS ONE. 15 , e0230221 , 1-27
[Research article]

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Old-growth forests play a major role in conserving biodiversity, protecting water resources, and sequestrating carbon, as well as serving as indispensable resources for indigenous societies. Novel silvicultural practices must be developed to emulate the natural dynamics and structural attributes of old-growth forests and preserve the ecosystem services provided by these boreal ecosystems. The success of these forest management strategies depends on developing an accurate understanding of natural regeneration dynamics. Our goal was therefore to identify the main patterns and drivers involved in the regeneration dynamics of old-growth forests with a focus on boreal stands dominated by black spruce (Picea mariana(L.) Mill.) and balsam fir (Abies balsamea(L.) Mill.) in eastern Canada. We sampled 71 stands in a 2 200 km(2)study area located within Quebec's boreal region. For each stand, we noted tree regeneration (seedlings and saplings), structural attributes (diameter distribution, deadwood volume, etc.), and abiotic (slope and soil) factors. The presence of seed-trees located nearby and slopes having moderate to high angles most influenced balsam fir regeneration. In contrast, the indirect indices of recent secondary disturbances (e.g., insect outbreaks or windthrows) and topographic constraints (slope and drainage) most influenced black spruce regeneration. We propose that black spruce regeneration dynamics can be separated into distinct phases: (i) layering within the understory, (ii) seedling growth when gaps open in the canopy, (iii) gradual canopy closure, and (iv) production of new layers once the canopy is closed. These dynamics are not observed in paludified stands or stands where balsam fir is more competitive than black spruce. Overall, this research helps explain the complexity of old-growth forest dynamics, where many ecological factors interact at multiple temporal and spatial scales. This study also improves our understanding of ecological processes within primary old-growth forests and identifies the key factors to consider when ensuring the sustainable management of old-growth boreal stands.

Authors/Creators:Martin, Maxence and Montoro Girona, Miguel and Morin, Hubert
Title:Driving factors of conifer regeneration dynamics in eastern Canadian boreal old-growth forests
Series Name/Journal:PLoS ONE
Year of publishing :2020
Article number:e0230221
Number of Pages:27
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 > 4 Agricultural Sciences > 401 Agricultural, Forestry and Fisheries > Forest Science
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Additional ID:
Type of IDID
Web of Science (WoS)000556908900052
ID Code:17474
Faculty:S - Faculty of Forest Sciences
Department:(S) > Dept. of Wildlife, Fish and Environmental Studies
Deposited By: SLUpub Connector
Deposited On:21 Sep 2020 10:47
Metadata Last Modified:15 Jan 2021 19:27

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