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Determining the main and interactive effect of age and clone on wood density, microfibril angle, and modulus of elasticity for Pinus radiata

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Abstract:

Detailed radial measurements of wood properties, taken at breast height, were obtained from control pollinated seedlings and a selection of 13year old radiata pine (Pinus radiata D. Don) clones. Using these data the key objectives of this study were to determine (i) the magnitude of mean clonal variation in modulus of elasticity (MOE) and properties affecting MOE (density and microfibril angle (MFA)) and (ii) whether there is a significant age× clone interaction for these traits. All wood properties were significantly affected by the main and interactive effects of age and clone. There was a relatively linear increase in both MOE and density with tree age, while MFA declined linearly with tree age. Values of density and MOE diverged between the clonal extremes from age 3 to age 12. After diverging markedly up to age 6, differences in MFA between clonal extremes remained relatively constant to age 12. At age 12, values for density, MFA, and MOE varied between clonal extremes by, respectively, 194kg·m–3 (465–659kg·m–3), 11.3° (9.6–20.9°), and 11.2GPa (10.4–21.6GPa). The seedling material had a relatively intermediate ranking, across the age range, for all traits considered.

Des mesures radiales détaillées des propriétés du bois ont été prises à hauteur de poitrine sur des semis issus d’une pollinisation contrôlée et sur des clones sélectionnés de pin radiata (Pinus radiata D. Don) D.Don âgés de 13 ans. À partir de ces données, les principaux objectifs de cette étude consistaient à déterminer (i) l’ampleur de la variation clonale moyenne du module d’élasticité (MOE) et des propriétés affectant le MOE (densité et angle des microfibrilles (AMF)) et (ii) s’il y a une interaction âge× clone significative dans le cas de ces traits. Les effets principaux et l’interaction âge× clone étaient significatifs pour toutes les propriétés du bois. Le MOE et la densité augmentaient de façon relativement linéaire tandis que l’AMF diminuait linéairement en fonction de l’âge d’arbre. Entre 3 et 12 ans, les valeurs de densité et de MOE divergeaient entre les extrêmes clonaux. Après avoir divergé de façon marquée jusqu’à l’âge de 6 ans, les différences d’AMF entre les extrêmes clonaux demeuraient relativement constantes jusqu’à 12 ans. À 12 ans, les valeurs de densité, d’AMF et de MOE variaient entre les extrêmes clonaux de respectivement 194kg·m–3 (465 à 659kg·m–3), 11,3° (9,6 à 20,9°) et 11,2GPa (10,4 à 21,6GPa). Le matériel issu des semis avait un classement relativement intermédiaire pour toute la gamme d’âges et tous les traits étudiés.

Document Type: Research Article

Publication date: August 1, 2010

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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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