TAILIEUCHUNG - Báo cáo khoa học: "Rapid measurement of trunk MOE on standing trees using RIGIDIMETER"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Rapid measurement of trunk MOE on standing trees using RIGIDIMETER. | Ann. For. Sci. 59 2002 465-469 INRA EDP Sciences 2002 DOI forest 2002030 465 Original article Rapid measurement of trunk MOE on standing trees using RIGIDIMETER Jean Launaya Milosh Ivkovichb Luc Pâquesb Catherine Bastienb Pascal Higelina and Philippe Rozenbergb aESEM Orléans 8 rue Léonard de Vinci 45072 Orléans Cedex 2 France bINRA Orléans 45160 ARDON France Received 5 July 2001 accepted 15 March 2002 Abstract - Rigidimeter is a device developed in order to determine the modulus of elasticity MOE of standing trees. It was used on a hybrid Larch clonal test located at INRA Orleans France. Some of the examined trees were felled and remeasured. The goal of this study was to contribute to the validation of the Rigidimeter as a fast non-destructive and reliable tool for rapid evaluation of MOE an important mechanical property of wood. Two measurements in orthogonal directions improve the accuracy especially in the presence of reaction wood. We have showed that two measurements of diameter including bark with a precision of 1 mm are sufficient to obtain a reliable second moment of area which is an important parameter for the estimation of trunk MOE. Bark MOE is small compared to wood MOE but bark thickness influences the measurement of tree diameter. A correction may be necessary to account for the presence of bark. We propose a method for estimating MOE of different trunk layers such as bark and mature wood layer. genetic improvement modulus of elasticity standing tree evaluation larch Résumé - Mesure rapide du module d elasticite des arbres sur pied à l aide du Rigidimètre. L appareil que nous avons développé pour me-surer le module d élasticité MOE des arbres sur pied le Rigidimètre est utilisé dans un test de mélèze hybride à l INRA d Orléans en France. L objectif de l étude est de contribuer à la validation de sa fiabilité pour la détermination rapide de cette propriété mécanique importante. Nous évaluons ici 1 laméthode demesure du diamètre du tronc 2 l .

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