| Summary: | Effects of Land Use on the Structure and the Diversity of Woodlands and Savannas in Benin. The dynamics of occupation of space by the extensive agriculture takes today increasing proportions in savannas of West Africa. It is in this context that this study was undertaken to evaluate the impact of the dynamics of occupation of the ground on the structure and the diversity of the vegetable groupings in the zone of Wari-Maro_Igbomakro to the Benin one. To this end, 72 readings of vegetation were taken in the various natural and anthropic vegetable formations. The data were treated by the techniques of multivariate analysis. According to the degree of degradation of the vegetable formations, specific diversity is weak (strong disturbance) or high (less disturbed) than translate the specific index of diversity of Shannon and the equitability of Pielou. On the basis of presence-absence of the species, the factors stationnels made it possible to define gradients of disturbance going from the less disturbed formations in the anthropized formations. Because of the demographic growth and human pressure on the grounds, by the nature of certain modes of exploitation and by the evolution of the farming systems, this agricultural dynamism is accompanied by a strong degradation by the natural environment and disturbance by environmental balances.
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