© 2002 by Institute of Chartered Foresters
External indicators of living branches with missing rings within a tree crown of Corsican pine
1 Cemagref, Division Ressources génétiques et plants forestiers, Domaine des Barres, F-45 290 Nogent-sur-Vernisson, France 2 CIRADamis, U.M.R. Botanique et Bioinformatique de l'Architecture des Plantes (AMAP), TA40/PS2, F-34 398 Montpellier cedex 5, France
The development and the number of rings of first-order branches on the stem of 17-year-old Corsican pine (Pinus nigra Arnold ssp. laricio Poiret Maire var. corsicana) were studied in order to characterize living branches with missing rings. For the thickest living branch of each tier, the difference between the number of growth units and the number of rings indicated that missing rings at the base of the branch are common in Corsican pine. Such branches can be externally characterized by a decrease in growth unit length associated with a lack of branching. These two architectural features may help to identify non-ring-producing branches, with implications for physiological studies on stembranch relationships and research into wood quality, as well as for management decisions concerning pruning.
Received 24 January 2002.