TAILIEUCHUNG - Báo cáo lâm nghiệp: "Linking intra-tree-ring wood density variations and tracheid anatomical characteristics in Douglas fir (Pseudotsuga menziesii (Mirb.) Franco)"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Linking intra-tree-ring wood density variations and tracheid anatomical characteristics in Douglas fir (Pseudotsuga menziesii (Mirb.) Franco). | Ann. For. Sci. 63 2006 699-706 INRA EDP Sciences 2006 DOI forest 2006050 699 Original article Linking intra-tree-ring wood density variations and tracheid anatomical characteristics in Douglas fir Pseudotsuga menziesii Mirb. Franco Cyrille B. K. RATHGEBERa Valérie DECOUXb c Jean-Michel Lebana a Centre INRA de Nancy UMR INRA-ENGREF 1092 Laboratoire d Étude de la Ressource Forêt-Bois LERFoB Équipe de Recherche Qualité des Bois 54280 Champenoux France b Université Libre de Bruxelles 50 av. F. Roosevelt SAAS-CP165 55 1050 Brussels Belgium c Current address Ministère de la région de Bruxelles capitale administration de l équipement et des déplacements direction des voiries cellule plantations 80 rue du Progrès 1030 Brussels Belgium Received 19 December 2005 accepted 12 May 2006 Abstract - In this study a geometric approach was used in order to model the relationships between intra-tree-ring wood density variations and tracheid anatomical characteristics. One Douglas fir was studied in detail. Anatomical slides of 256 tree-rings were compared with the corresponding density profiles. Radial and tangential tracheid diameters decline from earlywood to latewood by 50 and 15 respectively. At the same time radial and tangential cell-wall thicknesses increase by 110 and 132 respectively. Wood density exhibits an S-shape profile with a slight decrease of 10 at the beginning of a ring and an increase of 212 thereafter. Model simulations showed that wood density increase is mainly due to cell-wall thickening in tangential and radial directions as well as cell size reduction in radial direction. Simulations also showed that the knowledge of tracheid anatomical characteristics is not sufficient to fully explain wood density decrease at the beginning of earlywood. wood density wood anatomy wood quality image analysis Douglas fir Pseudotsuga menziesii Mirb. Franco Résumé - Relations entre les variations de densité à l interieur du cerne et les caractéristiques anatomiques des

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