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Báo cáo khoa học: "Height growth, shoot elongation and branch development of young Quercus petraea grown under different levels of resource availability"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: "Height growth, shoot elongation and branch development of young Quercus petraea grown under different levels of resource availability. | 65 Ann Sci For 1997 54 65-81 Elsevier INRA Original article Height growth shoot elongation and branch development of young Quercus petraea grown under different levels of resource availability c Collet F Colin F Bernier Equipe croissance et production Inra centre de Nancy 54280 Champenoux. France Received 18 April 1995 accepted 9 March 1996 Summary - Two-year-old sessile oaks were grown under various levels of resource availability in a semi-controlled conditions experiment. After 2 years the growth and the branching of the seedlings were assessed. A large number of seedlings showed an important development of lateral branches and sprout shoots growing from the root collar. Mortality of the apical bud changes in the allocation of shoot elongation between several shoots and changes in dominance occurred frequently. Higher resource availability increased annual shoot elongation by increasing the number of growth flushes produced in the growing season as well as the number and the length of the internodes produced in each flush. Resource availability also had a negative effect on the form of the seedling those grown under high resource availability showing more changes in dominance. apical control I recurrent flushing internode bud sprout shoot Resume - Effet de la disponibilité en ressources sur la croissance en hauteur elongation des rameaux et le développement des branches de jeunes Quercus petraea. Des chênes sessiles ages de 2 ans ont été installés dans des conditions d alimentation hydrique et minérale contrastées dans une experimentation en milieu semi-controlé. La crois-sance et la branchaison des plants après deux ans ont été évaluées. Un grand nombre d arbres ont présenté un développemcnt important des branches laterales et des rejets se développant depuis le collet du plant. L allon-gement des rameaux était frequemment réparti entre plusieurs tiges et les plants ont souvent montré des changements de dominance entre les differentes tiges. Le taux de .