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A growth model for azobé, Lophira alata, in Gabon

Engone Obiang N.L., Ngomanda A., White L., Jeffery K.J., Chézeaux E., Picard N.. 2012. Bois et Forêts des Tropiques (314) : p. 65-72. IUFRO International Conference on Research Priorities in Tropical Silviculture, 2011-11-15/2011-11-18, Montpellier (France).

Azobé, Lophira alata, is a major timber species in Central Africa classified as vulnerable into the IUCN red list. To date, despite numerous measures of increment, no growth model has been published for this species. This study aims to distinguish the effects between tree size and local competition on tree growth. A growth model was fitted for azobé, using data from four sites in Gabon. The growth model was designed to be useful for forest management that means it relied on variables that could be computed using forest inventory data. A lognormal growth model with a negative response to stand density and basal area has been selected. The relation between growth and size was unimodal with a maximum at 60 cm of diameter at breast height. A significant residual social status effect on growth has been found (with a slower growth for suppressed trees) while no residual site effect was found. (Résumé d'auteur)

Mots-clés : hauteur; modèle de croissance forestière; modèle mathématique; cubage d'arbre; aménagement forestier; espèce en danger; compétition végétale; croissance; forêt tropicale; lophira alata; gabon

Thématique : Foresterie - Considérations générales; Physiologie végétale : croissance et développement; Ecologie végétale; Méthodes mathématiques et statistiques

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