Tuyển tập các báo cáo nghiên cứu về sinh học được đăng trên tạp chí lâm nghiệp đề tài:"Intra- and interspecific variations of polycyclism in young trees of Cedrus atlantica (Endl.) Manetti ex. Carrière and Cedrus libani A. Rich (Pinaceae)" | Ann. For. Sci. 60 2003 19-29 INRA EDP Sciences 2003 DOI forest 2002070 19 Original article Intra- and interspecific variations of polycyclism in young trees of Cedrus atlantica Endl. Manetti ex. Carrière and Cedrus libani A. Rich Pinaceae Sylvie Sabatier Philippe Baradat and Daniel Barthelemy Unité Mixte de Recherche CIRAD-INRA-CNRS-EPHE-Univ. Montpellier II botAnique et bioinforMatique de l Architecture des Plantes TA 40 PSII 34398 Montpellier Cedex 5 France Received 15 November 2001 accepted 11 April 2002 Abstract - Growth pattern and polycyclism were studied for three French populations of Cedrus atlantica and ten populations of Cedrus libani seven Turkish and three Lebanese populations . The polycyclism rate and the length of annual shoots and growth units were recorded at two sites in France. There were significant variations in polycyclism rate and annual growth between the Turkish and Lebanese populations. Polycyclism appeared to be linked to the climatic conditions of the current growth year for French and Turkish populations unlike the Lebanese populations. The Turkish populations have exhibited a greater stability as well at the between-station as at the between-year levels. Polycyclism appears as an adaptive trait of trees to difficult growth conditions. The construction of a dendrogram based on polycyclism and annual shoot length revealed two distinct main clusters corresponding to the different geographical origins. Polycyclism could be used in breeding and genetic improvement programmes of these species. Cedrus atlantica Cedrus libani polycyclism growth pattern morphological variability Résumé - Variations intra- et interspecifiques du polycyclisme chez de jeunes arbres de Cedrus atlantica Endl. Manetti ex. Carrière et Cedrus libani A. Rich Pinaceae . Les variations de croissance et du polycyclisme ont été étudiées pour trois provenances franqaises de Cedrus atlantica et pour dix provenances de Cedrus libani comprenant sept provenances turques
