A growth model for azobé, Lophira alata, in Gabon

A growth model for azobé, Lophira alata, in Gabon

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.

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Bibliographic Details
Main Authors: Engone Obiang, Nestor Laurier, Ngomanda, Alfred, White, Lee, Jeffery, Kathryn J., Chézeaux, Eric, Picard, Nicolas
Format: article biblioteca
Language:eng
Subjects:K01 - Foresterie - Considérations générales, F62 - Physiologie végétale - Croissance et développement, F40 - Écologie végétale, U10 - Informatique, mathématiques et statistiques, Lophira alata, forêt tropicale, croissance, compétition végétale, espèce en danger, aménagement forestier, cubage d'arbre, modèle mathématique, modèle de croissance forestière, hauteur, http://aims.fao.org/aos/agrovoc/c_4431, http://aims.fao.org/aos/agrovoc/c_24904, http://aims.fao.org/aos/agrovoc/c_3394, http://aims.fao.org/aos/agrovoc/c_35264, http://aims.fao.org/aos/agrovoc/c_2557, http://aims.fao.org/aos/agrovoc/c_16129, http://aims.fao.org/aos/agrovoc/c_28056, http://aims.fao.org/aos/agrovoc/c_24199, http://aims.fao.org/aos/agrovoc/c_1374844914634, http://aims.fao.org/aos/agrovoc/c_3536, http://aims.fao.org/aos/agrovoc/c_3161,
Online Access:http://agritrop.cirad.fr/568129/
http://agritrop.cirad.fr/568129/1/BFT_314_65-72.pdf
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Summary: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.

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