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The influence of thinning and tree size on the sapwood area / leaf area ratio in coigue

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The effect of thinning and crown class on the projected leaf area, specific leaf area, and projected leaf area / sapwood area ratio was evaluated in a 48-year-old even-aged stand of coigue (Nothofagus dombeyi (Mirb.) Oerst.). The data were collected through destructive sampling of 27 trees and analyzed with analysis of variance and regression models. The projected leaf area was greater in trees from more intensely thinned stands. The specific leaf area and the projected leaf area / sapwood area ratio did not vary between treatments. The sapwood cross-sectional area at breast height (1.3 m) and at the base of the live crown provided the best fit for the relationship between projected leaf area and sapwood area. The current sapwood area provided the worst fit, suggesting that at an early age, coigue sapwood does not present permeability problems associated with tyloses.

Les effets de l'éclaircie et de la classe de cime sur la surface foliaire projetée, la surface foliaire spécifique et le rapport de la surface foliaire projetée sur la surface d'aubier ont été évalués dans un peuplement équienne de coigue (Nothofagus dombeyi (Mirb.) Oerst.) âgé de 48 ans. Les données provenaient d'échantillons prélevés sur 27 arbres et ont été traitées à l'aide d'analyses de variance et de régression. La surface foliaire projetée augmentait avec l'intensité de l'éclaircie. La surface foliaire spécifique et le rapport de la surface foliaire projetée sur la surface d'aubier ne variaient pas d'un traitement à l'autre. Les meilleurs ajustements pour la relation entre la surface foliaire projetée et la surface d'aubier ont été obtenus avec la surface d'aubier mesurée à hauteur de poitrine (1,3 m) et à la base de la cime vivante. La surface d'aubier de l'année en cours donnait le pire ajustement, indiquant qu'en bas âge l'aubier de coigue ne présente pas de problèmes de perméabilité dus à la présence de thylles.[Traduit par la Rédaction]

Document Type: Research Article

Publication date: July 1, 2005

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  • Published since 1971, this monthly journal features articles, reviews, notes and commentaries on all aspects of forest science, including biometrics and mensuration, conservation, disturbance, ecology, economics, entomology, fire, genetics, management, operations, pathology, physiology, policy, remote sensing, social science, soil, silviculture, wildlife and wood science, contributed by internationally respected scientists. It also publishes special issues dedicated to a topic of current interest.
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