tailieunhanh - Báo cáo lâm nghiệp: "Tension wood occurrence in three cultivars of Populus × euramericana. Part I: Inter-clonal and intra-tree variability of tension wood"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: "Tension wood occurrence in three cultivars of Populus × euramericana. Part I: Inter-clonal and intra-tree variability of tension wood" | Ann. For. Sci. 63 2006 23-30 INRA EDP Sciences 2006 DOI forest 2005095 23 Original article Tension wood occurrence in three cultivars of Populus X euramericana. Part I Inter-clonal and intra-tree variability of tension wood Miguel Angel Badia Thiéry Constant Frédéric Mothe Gérard Nepveu LERFOB UMR INRA-ENGREF Wood Quality Research Team Research Centre of Nancy 54280 Champenoux France Received 25 September 2004 accepted 31 May 2005 Abstract - The main wood quality problem affecting poplar trees is tension wood occurrence associated to end-splits after felling distortions of products woolly wood etc. The objective of this study was to estimate the occurrence of tension wood by using the external shape of the stem and the 3D distribution of annual growth rings. This paper is the first of two papers and presents the inter-clonal and intra-tree tension wood variability. A clear clonal-effect was observed on tension wood area percentage I-MC I214 Luisa Avanzo . The clone with the best tree morphology I-MC showed the highest percentage of tension wood . Concerning the intra-tree variability tension wood extent increased significantly at the tree base 30-50 cm . In the radial direction of the stem the percentage of tension wood showed an U-shape distribution. The first peak close to the pith corresponds to the establishment growth period during the open growth and the second peak close to the bark corresponds to the competition growth period . tension wood poplar variability cultivar secondary growth Résumé - Presence de bois de tension dans trois variétés de Populus X euramericana. Partie I Variabilité inter-clonale et intra-arbre du bois de tension. Le principal problème de qualité affectant les peupliers est la presence de bois de tension associée aux fentes à l abattage aux déformations des sciages ou au bois pelucheux. L objectif principal de ce travail est d estimer la distribution du bois de tension à partir de la forme détaillée de l arbre et de son .