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The regeneration of woody species is of major interest to ecologists in connec- tion with ecosystem renewal. This study aimed (i) to analyse the regeneration potential of vegetation units in Benin’s Sudanian zone, (ii) to document the var- iations in regeneration potential accord- ing to the relief. A total of 615 survey plots 25 m2 in area were marked out in 13 vegetation units in the Pendjari Bio- sphere Reserve. An inventory of regenera- tion was made by counting the number of individuals per species in each plot. We used the log-linear model with a Poisson regression to model regeneration density and the number of regenerating species for four types of relief. The regeneration potential of vegetation units in the Pend- jari Biosphere Reserve closely reflects the species composition of the plant cover. The Poisson regression shows that the relief has a significant effect on regenera- tion density and on the number of regen- erating species. Regeneration potential in floodplains and along rivers is signif- icantly lower than in hilly and plateau areas. Compared to plateau areas (index 1), the indices for observed regeneration density along rivers, in floodplains and in hilly areas are 1.01, 0.67 and 2.1 respec- tively. The number of regenerating spe- cies increases from plateau to hilly areas, but drops from plateau areas to flood- plains and riversides. Topographic condi- tions thus influence the establishment of woody species in Sudanian zones.

EFFET DU RELIEF SUR LA RÉGÉNÉRATION DES ESPÈCES LIGNEUSES EN ZONE SOUDANIENNE DU BÉNIN