tailieunhanh - Báo cáo khoa học: "enetic control of stiffness of standing Douglas fir; from the standing stem to the standardised wood sample, relationships between modulus of elasticity and wood density parameters. Part I"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Genetic control of stiffness of standing Douglas fir; from the standing stem to the standardised wood sample, relationships between modulus of elasticity and wood density parameters. Part I. | Ann. For. Sci. 56 1999 133-143 Inra Elsevier Paris 133 Original article Genetic control of stiffness of standing Douglas fir from the standing stem to the standardised wood sample relationships between modulus of elasticity and wood density parameters. Part I Cécile Mamdy Philippe Rozenberg Alain Franc Jean Launay Nicolas Schermann Jean-Charles Bastien Inra Orleans 45160 Ardon France Received 18 December 1997 accepted 1 October 1998 Abstract - The Institut national de la recherche agronomique Inra developed a tree-bending machine similar to the device elaborated by Koizumi and Ueda and used it to measure the stiffness of standing tree trunks modulus of elasticity MOE . There are moderate or good relationships between trunk MOE and MOE based on destructive samples successively sawn in the study stems the modulometre is able to rank genetic units for a trait related to the MOE of the wood of the stem. Our study showed that there exists a strong genetic effect on trunk MOE. This trait and the MOE measured on destructive samples are moderately related best r2 from to with ring density parameters based on trimming the ring in two parts earlywood and latewood and closely related best r2 from to with parameters describing the shape of a mean density profile segment mostly located in the latewood part of the ring. Inra Elsevier Paris. genetics modulus of elasticity stem mechanics I wood density Douglas fir Resume - Modélisation du module d elasticite à 1 aide de données microdensitométriques methodes et effets génétiques. lre partie. LTnra a fabrique une machine servant à mesurer la rigidité du tronc des arbres sur pied Module d Elasticite du tronc de 1 arbre sur Pied MEP inspirée de celle imaginée et construite par Koizumi et Ueda au Japon. Des mesures de module de Young en flexion statique réalisées sur des échantillons de taille variable débités dans les troncs des arbres sur lesquels on a mesuré le MEP sont assez bien OU bien liées avec les mesures

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