tailieunhanh - Báo cáo khoa học: "Branching in young clonal oak"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Branching in young clonal oak. | Ann Sci For 1993 50 Suppl 1 399s-402s Elsevier INRA 399s Original article Branching in young clonal oak R Harmer Forest Research Station Wrecclesham Farnham Surrey GU104LH UK Summary Shoot length and branch production by 5 clones of oak were observed during 2 consecutive flushes of growth. The influence of decapitation was investigated by removal of the terminal bud at the start of each flush. The decapitation treatment had no effect on the length of the new leading shoot produced during each flush but there were significant differences between clones. The number of branches produced was usually greater in decapitated plants but clonal differences varied between flushes. Quercus petraea I clone I decapitation I branching Resume Branchaison de jeunes boutures de chênes. Des observations portant sur la longueur des pousses et la production de branches ont été faites au cours de 2 années successives sur 5 clones de chêne Q petraea . Les observations ont également porté sur I effet des decapitations du bourgeon terminal au debut de la saison de vegetation. La decapitation n a pas d effet signi-ficatifsur la longueur de pousse produite malgré les differences observées entre clones. Le nombre de branches produites est plus important sur les boutures décapitées des differences existent entre clones et entre pousses. Quercus petraea clone decapitation branchaison INTRODUCTION Observations of mature oak trees indicate that there are considerable differences in stem and crown form but at present it is not possible to describe the processes leading to the formation of trees with different forms. The current Forestry Commission tree improvement program is studying branching patterns in oak. The aims are to gain more information on the process of crown formation and to develop methods for the early selecion of individual trees or clones that will form mature trees with good stem and crown forms. The following experiment describes our first investigation of variation in branch .