Balsam fir (Abies balsamea) establishment dynamics during a spruce budworn (Choristoneura fumiferana) outbreak: an evaluation of the impact of aging techniques

Parent, S.; Morin, H. et Messier, C. (2001). « Balsam fir (Abies balsamea) establishment dynamics during a spruce budworn (Choristoneura fumiferana) outbreak: an evaluation of the impact of aging techniques ». Canadian Journal of Forest Research, 31, pp. 373-376.

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Résumé

The effects of recurrent spruce budworm (Choristoneura fumiferana (Clem.)) outbreaks on balsam fir (Abies balsamea (L.) Mill.) mortality have been extensively studied in Canada. Most studies report substantial seedling recruitment of balsam fir during outbreaks when reproductive trees are dying. According to previous research, this contradiction could be due to inaccuracies in the conventional aging method. Counting the maximum number of growth rings found at the tree base would significantly underestimate tree age. Counting terminal bud scars found on the entire trunk, including buried stem, would give a more accurate tree age. In this study, we compare recruitment dynamics obtained for aging seedlings in two balsam fir populations (about 500 km apart) using (i) the conventional method and (ii) bud scar counts. For both populations, the conventional method shows substantial recruitment during adult mortality, while the second aging technique reveals reduced recruitment during the epidemic phase of the spruce budworm outbreak.

Type: Article de revue scientifique
Mots-clés ou Sujets: spruce budworm, Balsam fir, impact, aging techniques
Unité d'appartenance: Faculté des sciences > Département des sciences biologiques
Déposé par: Christian Messier
Date de dépôt: 07 janv. 2009
Dernière modification: 01 nov. 2014 02:08
Adresse URL : http://www.archipel.uqam.ca/id/eprint/1588

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