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Stem form and compression wood formation in young Pinus radiata trees

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Abstract:

The crooked stems of some individuals of radiata pine (Pinus radiata D. Don) can hinder volume recovery and wood quality. To infer causes of crookedness and to learn how lean angle affects compression wood (CW) formation we studied 5-year-old trees in southern Chile. Eight initially straight and eight initially crooked trees were tethered initially to angles of 15° or 30° or were left untethered for 131days (48 trees total). There were no significant differences between straight and crooked trees in the extent of CW in pretreatment wood or in the relationship between stem angle and CW extent. Crooked trees, however, righted themselves more quickly than did straight trees at angles<15°, a result that supports the overcompensation hypothesis for the development of crooked stems. Stem angle had a complex effect on CW extent. In 2- to 3-year-old wood there was no meaningful effect of angle on CW extent. One-year-old wood produced less CW at stem angles<10° thanat stem angles >10°, but above or below that threshold, there was no meaningful effect of angle on CW extent. The intertree differences in CW extent, as well as the correlation of leader CW extent with bole CW in the best individuals, suggests that CW assays could be used for early screening for wood quality.

Chez le pin de Monterey (Pinus radiata D.Don), certains individus ont une tige tordue, ce qui peut affecter le rendement en volume et la qualité du bois. Afin d’élucider les causes de cette déformation et de comprendre comment l’inclinaison affecte la formation du bois de compression (BC), les auteurs ont étudié des arbres âgés de 5ans dans le sud du Chili. Huit arbres initialement droits et huit autres initialement tordus ont été inclinés à 15° ou 30° ou ont été laissés libres pendant 131 jours (48 arbres au total). Aucune différence significative n’a été observée avant le traitement entre les arbres droits et les arbres tordus quant à l’ampleur du BC ou à la relation entre l’angle de la tige et l’ampleur du BC. Cependant, les arbres tordus se sont redressés plus rapidement que les arbres droits à des angles <15°, ce qui appuie l’hypothèèse de la surcompensation dans le développement des tiges tordues. L’angle de la tige a eu un effet complexe sur l’ampleur du bois de compression. Dans le bois âgé de deux à trois ans, l’angle n’a pas affecté l’ampleur du BC de manière significative. Le bois d’un an a produit moins de BC lorsque l’angle de la tige était inférieur à 10°, mais au-dessus ou au-dessous de ce seuil, l’angle n’affectait pas significativement l’ampleur du BC. Les différences dans l’ampleur du BC entre les arbres, ainsi que la corrélation entre l’ampleur du BC de la pousse terminale et celle de la tige chez les meilleurs individus, indiquent que la détection du BC pourrait être utilisée pour le dépistage hâtif de la qualité du bois.

Document Type: Research Article

Publication date: January 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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