Cette étude a été réalisée afin de caractériser les systèmes agroforestiers (SAF) à base de cacaoyers dans les trois dernières zones de production cacaoyère en Côte d’Ivoire (Centre-Ouest, Sud-Ouest et Ouest). Pour y arriver, un inventaire floristique couplé à des mesures dendrométriques ont été réalisés dans 411 parcelles de 625 m² installées dans différentes cacaoyères. Il ressort de cet inventaire que la richesse spécifique moyenne par parcelle est de 3,11 (Ouest) ; 3,26 (Centre-Ouest) et 1,92 (Sud-Ouest). La densité des arbres associés est de 48,16 individus/ha (Ouest) ; 22,79 individus/ha (Centre-Ouest) et 25,39 individus/ha (Sud-Ouest). Les parcelles de l’Ouest sont dominées par des arbres de hauteur ≤ 8 m. Celles du Centre-Ouest et du Sud-Ouest sont dominées par des arbres dont la hauteur est supérieure à 8 m. L’analyse multivariée a permis d’identifier trois SAF. Les SAF complexes jeunes à canopée ouverte, rencontrés à l’Ouest, sont caractérisés par une forte densité d’arbres associés. Les SAF simples à forte densité de cultures pérennes associées sont présents au Centre-Ouest. Les SAF simples à cacaoyères vieillissantes sont caractéristiques des parcelles du Sud-Ouest avec 30 ans d’âge en moyenne. Ces résultats mettent en évidence une variation des SAF suivant le gradient de production cacaoyère. This study was carried out to characterize cocoa-based agroforestry systems (FAS) in the last three cocoa-producing areas in Côte d'Ivoire (Centre-West, South-West and West). To achieve this, a floristic inventory coupled with dendrometric measurements were carried out in 411 plots of 625 m² installed in different cocoa farms. This inventory showed that the average species richness per plot was 3.11 (West), 3.26 (Centre-West) and 1.92 (South-West). The density of associated trees is 48.16 individuals/ha (West), 22.79 individuals/ha (Central West) and 25.39 individuals/ha (South West). Plots in the West are dominated by trees ≤ 8 m in height. Those in the Centre-West and South-West are dominated by trees taller than 8 m. The multivariate analysis conducted identified three FAS. The young complex FAS with an open canopy, found in the west, are characterized by a high density of associated trees. Simple FAS with a high density of associated perennial crops are found in the Centre-west. Simple FAS with ageing cocoa farms are characteristic of plots in the south-west, with plots averaging 30 years in age. These results show that FAS vary according to the cocoa production gradient.
This study was initiated to contribute to the sustainable management of biodiversity in mining sites in Cote dIvoire. Its objective is to determine the impacts of gold mining activities on the flora of the Sissengue gold mine located in the department of Tengrela in northern Cote dIvoire. The flora inventory was conducted along a 500 m transect combined with the surface survey and roving inventory methods. The surface survey method consisted of delimiting a 25 m x 25 m (400 m2) plot at the end of each transect. In total, nine (09) types of land use were identified in the site, namely annual crops, perennial crops, open forests, forest galleries, tree savannahs, shrub savannahs, burned areas, lakes or water reservoirs, and locality. The floristic inventories carried out in seven (07) types of land occupations allowed the identification of 207 plant species distributed among 155 genera and 61 families. In addition, thirteen (13) species with special ecological status and seven (07) species included in the IUCN red list, four of which are vulnerable. However, the floristic diversity is low in all plant formations with an average of 1.91. The shrubby savannahs record the highest densities with 1705 stems/ha while the forest galleries and open forests record the highest values of basal area, with respectively 37.2 m2/ha and 28.1 m2/ha. These vegetation formations are disturbed by the mines gold mining activities. Efforts to conserve areas dedicated to biodiversity conservation must be a priority for mining sites in Cote dIvoire.
One of these species, Baphia Bancoensis Aubrév, is endemic in Ivory Coast. In the park, the agricultural activities have reduced the number of trees which diameter is over 30 cm. Although the infiltration of clandestines in the NPM started long before the beginning of the conflicts, our work nevertheless permitted to point out them. During this period, these infiltrations were accelerated mainly because these people were looking for new lands to cultivate cocoas trees.
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