TAILIEUCHUNG - Báo cáo khoa học: "An evaluation of decapitation as a method for selecting clonal Quercus petraea (Matt) Liebl with different branching intensities"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài:"An evaluation of decapitation as a method for selecting clonal Quercus petraea (Matt) Liebl with different branching intensities. | Ann Sci For 1995 52 89-102 Elsevier INRA 89 Original article An evaluation of decapitation as a method for selecting clonal Quercus petraea Matt Liebl with different branching intensities R Harmer c Baker Forestry Commission Research station Alice Holt Lodge Wrecclesham Farnham Surrey GU10 4LH UK Received 25 January 1993 accepted 2 September 1994 Summary The effect of decapitation on branch production in 5 clones of oak was observed over the 2 flushes of growth occurring during 1 season. Concurrent experiments were carried out under natural conditions in the nursery and 2 different temperature regimes in growth chambers. Decapitation had no effect on the number of buds becoming active but usually increased both the proportion of active buds forming branches and the number of branches produced during each flush. More branches were formed during the first flush of growth but the largest effect of decapitation occurred during the second flush. There were significant differences between clones but the clonal order of branchiness varied between flushes and treatment. Lower temperatures reduced the rate of shoot development but had only small effects on the length of new leading shoot and the proportion of buds becoming branches. The significance of these results for the selection of oaks with different branching patterns is discussed. Quercus petraea I clone bud branching Resume Une evaluation de la decapitation comme methode de selection clonale de Quer-cus petraea Matt Liebl présentant differentes intensités de branchaison. Les effets produits par la decapitation sur la ramification observée sur 5 clones de chêne ont été étudiés au cours des 2 vagues de croissance se produisant en une saison. Des experiences sent effectuees simultanément en pépinière dans des conditions naturelies et en laboratoire en ayant recours à 2 regimes de temperatures differents. La decapitation n affecte en rien le nombre des bourgeons devenant actifs tableau III alors qu elle augmente .

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