TAILIEUCHUNG - Báo cáo lâm nghiệp: "Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp Original article đề tài: Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species. | Ann. For. Sci. 64 2007 503-510 INRA EDP Sciences 2007 DOI forest 2007027 Available online at Original article Comparison of physical and mechanical properties of tension and opposite wood from ten tropical rainforest trees from different species Julien RUELLEa b Jacques BEAUCHENEa Anne THIBAUTa Bernard THIBAUTa a UMR EcoFoG Campus agronomique - BP 709 97387 Kourou Cedex Guyane Fran aise b Present adress School of Bioagricultural Sciences Nagoya University Chikusa Nagoya 464-8601 Japan Received 15 August 2006 accepted 27 February 2007 Abstract - On 10 trees from 10 species of French Guyana tropical rainforest in a clear active process of restoring verticality growth strains were measured in situ in order to determine the occurrence of tension wood within samples. Wood specimens were cut in the vicinity of the growth strains measurements in order to measure some mechanical and physical properties. As suspected tensile growth strains was very much higher in tension wood zone because longitudinal modulus of elasticity was slightly higher. Longitudinal shrinkage was also much higher in tension wood than in opposite wood. tension wood opposite wood tropical rainforest physical and mechanical properties Résumé - Comparaison du bois de tension et du bois oppose de dix arbres provenant d espèces differentes de forêt tropicale humide. Des mesures de contraintes de croissance ont été réalisées sur 10 arbres en cours de redressement actif appartenant à 10 espèces de la forêt tropicale humide de Guyane Fran aise afin de s assurer de la présence de bois de tension. Des échantillons de bois prélevés au voisinage des mesures de contraintes de croissance ont permis de mesurer un certains nombres de propriétés physiques et mécaniques. Comme présumé les contraintes de croissance sont beaucoup plus élevées au niveau du secteur de bois de tension car le module d élasticité est légèrement plus élevé. Le retrait longitudinal est aussi plus élevé dans le bois .

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