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L’une des composantes cle de la dynamique des forets est la croissance des especes qui est a ce jour peu maitrisee. L’objectif de la presente etude est de maitriser les variables de competition qui decrivent le mieux la trajectoire de croissance du Moabi en peuplement heterogene. Vingt placettes semi permanentes circulaires de 20 m de rayon centrees sur chacun des 60 arbres etudies ont ete mises en place par la Societe Pallisco depuis 2008. Seul l’indice de surface terriere relative du peuplement ponderee par la distance avec l’arbre considere explique le mieux l’accroissement en diametre et l’accroissement en surface terriere de maniere soutenue. La combinaison predisant le mieux l’accroissement diametrique du Moabi comporte trois variables dont deux indices independants des distances, et un dependant des distances et correspondant au diametre cumule des arbres du peuplement pondere par la distance avec l’arbre considere.En definitive, au-dela des indices de concurrence independants et dependants de la distance, le diametre moyen des arbres et l’indice d’eclairement du houppier peuvent rentrer dans l’elaboration d’un modele predictif efficient de l’accroissement en diametre et en surface terriere en vue de planifier l’exploitation durable de cette essence. © 2017 International Formulae Group. All rights reserved. Mots cles: Accroissement en diametre, competition vegetale, indices de concurrence, modele de croissance, predictibilite de la croissance English Title:  Analysis of effect of plant competition on the growth of Moabi in dense tropical disturbed forest of Eastern-Cameroon English Abstract One of the key components of forest dynamic is the species growth which is less mastered today. The aim of the present study was to master competitive variables that best describe the growth pattern of Moabi in an heterogenous stand. Twenty semi-permanent circular plots of 20 m radius centred on each of the 60 trees studied were established by the Pallisco Company in 2008. Only the stand relative basal area index pondered with the distance to a reference tree best explain the increase in diameter and basal area in a sustainable manner. The combination that best predict the increase in diameter of Moabi is composed of three variables of which two indices independent of the distances, and one that depends on the distances and which corresponds to the cumulated diameter of trees from the stand pondered by the distance to a reference tree. In all, apart from the indices independent and dependent of the distances, the mean diameter of trees and the canopy light index can be considered in the elaboration of an efficient predictive model of the increase in diameter and in basal area when planning the sustainable exploitation of the species. © 2017 International Formulae Group. All rights reserved. Keywords: Competitive indices, growth model, growth prediction, increase in diameter, vegetation competition

Analyse de l’effet de la concurrence végétale sur la croissance du Moabi en forêt dense tropicale perturbée de l’Est – Cameroun