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La presente etude vise a caracteriser la dynamique de croissance des peuplements de Legumineuses arborescentes dans la reconstitution des friches post-culturales de la zone forestiere. L\'etude a ete menee a Oume, ville situee en zone de foret dense semi-decidue de Cote d\'Ivoire sur Albizia adianthifolia et Albizia zygia. La dynamique d\'un peuplement peut etre abordee sous plusieurs aspects. Mais, dans ce travail, seuls quelques lements caracteristiques ont ete retenus. Il s\'agit de l\'evolution de la densite des peuplements, de l\'evolution du recouvrement basal (surface terriere) et de la relation entre l\'evolution de la richesse floristique du milieu et celle de la densite des peuplements. Les resultats montrent que les Albizia sont presents depuis les premiers stades de la reconstitution floristique de la jachere jusqu\'au-dela de 35 ans. Cependant, les maxima de densite et de recouvrement basal ont ete atteints dans les jacheres de 11 a 20 ans et de 21 a 30 ans. On note en outre que l\'evolution de la densite des Albizia et celle de la richesse floristique des formations spontanees sont independantes. Au-dela de 40 ans, les deux especes Albizia adianthifolia et Albizia zygia disparaissent pour au profit d\'autres ligneux. This study aims at characterizing the growth dynamic of the settlement of local legume trees under forest regeneration. It was conducted on two species (Albizia adianthifolia and Albizia zygia)in the Oume sector, a semi-deciduous forest area of Cote d\'Ivoire . The dynamic of the vegetation can be assessed trough several means. However, in this work, the characteristic of certain parameters, were ascertained. These included plant density ,basal area, the relationship between floristic richness and Albizia density Results show that both Albizia species were present since the first stages of fallow and and remained beyond 35 years. However, density and basal area were between [11, 20] years old and [21, 30] years old , respectively. density and floristic richness besides these species were independent. Otherwise, beyond 40 years of fallow, both species disappeared to make place to other woody species. Keywords :dynamique, Albizia, jachere naturelle, zone de foret semi-decidue, Cote d'Ivoire. Agronomie Africaine Vol. 19 (2) 2007: pp. 125-135 |
