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- Title
Race to the canopy: the development of tree size hierarchies following a partial disturbance in a boreal old-growth forest.
- Authors
Kulha, Niko; Ahokas, Antti; Gauthier, Sylvie; Aakala, Tuomas
- Abstract
In boreal old-growth forests, advance regeneration typically attains canopy dominance through growth release events following partial disturbances. We sampled competing Picea mariana (Mill.) and Abies balsamea (L.) in disturbed old-growth stands in Quebec, Canada, to understand the intra- and interspecific size hierarchy development. We reconstructed tree size development and examined the role of initial size difference, time between germination and a disturbance, and the strength of response to the disturbance in determining tree size hierarchies. Trees that regenerated first generally dominated their intraspecific competitors also following a disturbance event. However, prolonged time between germination and disturbance resulted in a less deterministic outcome. Tree size difference prior to disturbance also influenced the development of size hierarchies. In interspecific competition between individuals of the same diameter, A. balsamea had a 61% probability of gaining dominance over P. mariana, the probability being 50% if P. mariana was 5 mm larger than A. balsamea. Dominant trees generally had the strongest response to the disturbance, reinforcing the existing size hierarchies. The largest trees typically gain dominance after a partial disturbance. However, interspecific competition is less predictable than intraspecific competition, small initial size difference, and prolonged time in suppression potentially changing tree size hierarchies.
- Subjects
QUEBEC (Quebec); TREE size; TAIGAS; BLACK spruce; BALSAM fir; COMPETITION (Biology); GERMINATION
- Publication
Canadian Journal of Forest Research, 2023, Vol 53, Issue 12, p996
- ISSN
0045-5067
- Publication type
Article
- DOI
10.1139/cjfr-2022-0224