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A new device has been developed in order to determine experimentally the modulus of elasticity of standing trees. Following preliminary trials on aluminum and steel beams, its performances have been compared to the one of another equipment built according to the model proposed by Koizumi (1987). Large-scale trials were then carried out on Douglas-fir and larch plantations of 72 and 292 trees, respectively. Results showed that the new device described here allowed rapid assessments of the mechanical characteristics presented by populations of rather young trees (i.e.: less than 20 years old). Thus, the data obtained with the device can efficiently be included in selection schemes along with other criteria.Un nouveau dispositif destiné à la mesure du module d’élasticité des arbres sur pied a été mis au point. Après l’avoir testé sur des poutres en acier et en aluminium, il a été comparé à un autre appareillage construit sur le modèle de celui proposé par Koizumi. Des essais à grande échelle sur des plantations de douglas (72 arbres) et de mélèzes (292 arbres) ont montré que ce dispositif permet de mesurer rapidement les caractéristiques mécaniques d’une population d’arbres assez jeunes (moins de 20 ans) et d’effectuer efficacement une sélection en prenant en compte ce critère parmi d’autres

A new experimental device for rapid measurement of the trunk equivalent modulus of elasticity on standing trees