Abstract
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• Awareness of the shortage of fossil resources leads to an increasing demand for woody biomass. We investigated the feasibility of using fast-growing Gmelina arborea wood for material production. Gmelina arborea wood samples were collected from trees of varying cambium ages in Indonesia, from 3.5-, 7- and 12-year-old plantations.
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• The lateral growth rate and the cambium age did not significantly affect the longitudinal released strain of the growth stress, xylem density, or microfibril angle at the outermost surface of the secondary xylem at any sampling site. However, fiber length in the 3.5-year-old plantation tended to be shorter in smaller diameter trees, whereas in larger diameter trees it was almost the same as that in trees from the 7- and 12-year-old plantations. This suggests that smaller diameter trees in the 3.5-year-old plantation had not yet produced mature wood.
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• Xylem qualities had already reached values appropriate for harvesting, except in the smaller diameter trees from the 3.5-year-old plantation. This indicates that the larger diameter trees had already matured, regardless of their cambium age. These results suggest that the next step is to develop silvicultural treatments to increase the lateral growth rate during the early growing stage, in order to produce as much mature wood as possible, as quickly as possible.
Résumé
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• La prise de conscience de la raréfaction des ressources fossiles conduit à une demande croissante de biomasse ligneuse. Dans ce contexte nous avons examiné la faisabilité d’utiliser une essence à croissance rapide Gmelina arborea pour la production de bois matériau.Nous avons collecté en Indonésie des échantillons de bois dans des arbres provenant de plantations de 3,5, 7 et 12 ans.
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• Pour tous les sites, le taux de croissance radiale et l’âge cambial n’affectent pas les déformations résiduelles longitudinales des contraintes de croissance, la densité du xylème ou l’angle des microfibrilles de la périphérie du xylème secondaire. Cependant pour les petits arbres de la plantation de 3,5 ans, les fibres sont plus courtes tandis que pour les gros arbres les fibres ont une longueur comparable à celle des arbres des plantations de 7 et 12 ans. Cela suggère que les petits arbres de la plantation de 3,5 ans ne produisent pas encore du bois mature.
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• Les qualités du xylème ont facilement atteint des valeurs justifiant l’exploitation exception faite des petits arbres de la plantation de 3,5 ans. Cela indique que les gros arbres sont déjà matures indépendamment de leur âge. Ces résultats suggèrent que l’étape suivante est le développement de traitements sylvicoles visant à augmenter le taux de croissance radiale durant le stade initial de croissance, dans le but de produire le plus rapidement possible le plus de bois adulte.
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Kojima, M., Yamamoto, H., Marsoem, S.N. et al. Effects of the lateral growth rate on wood quality of Gmelina arborea from 3.5-, 7- and 12-year-old plantations. Ann. For. Sci. 66, 507 (2009). https://doi.org/10.1051/forest/2009031
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DOI: https://doi.org/10.1051/forest/2009031