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La reserve speciale botanique de Noflaye est un des rares ecosystemes particuliers de la zone des niayes de Dakar de par sa diversite floristique. Ce complexe est aujourd’hui menace par un certain nombre de facteur tel que l’urbanisation. Cette etude a ete realisee pour caracteriser la structure de la vegetation du milieu. L’utilisation de la methode des releves dendrometriques nous a permis de caracteriser la vegetation du milieu. Les resultats indiquent que la richesse floristique du milieu est de 65 especes ligneuses reparties en 50 genres et 31 familles avec une dominance des especes soudanienne (39%). L’analyse de la contribution specifique montre que Lepisanthes senegalensis (19,7%), Neocarya macrophylla (14,5%) et Grewia bicolor (13,4%) sont les plus frequentes dans le milieu. Les valeurs elevees de densite theorique, de densite reelle, de surface terriere et de recouvrement aerien montrent que le milieu est domine par des especes ligneuses de petit diametre (5 a 10 cm) a cime jointive. La regeneration est dominee par Boscia senegalensis (53%). Ces resultats obtenus sont importants dans la conservation du milieu et la mise en place d’un plan de gestion. Mots cles : Flore, vegetation, reserve speciale botanique, Noflaye, Senegal. English Title: Structure and dynamics of the flora and vegetation of the botanical reserve Noflaye (Senegal) The botanical special reserve of Noflaye is one of the rare special ecosystems of the zone of the niayes of Dakar because of its floristic diversity. This complex is now threatened by a number of factors such as urbanization. This study was carried out to characterize the structure of the vegetation of the environment. The use of the dendrometric survey method allowed us to characterize the vegetation of the environment. The results indicate that the floristic richness of the environment is 65 woody species divided into 50 genera and 31 families with Sudanese species dominance (39%). The analysis of the specific contribution shows that Lepisanthes senegalensis (19.7%), Neocarya macrophylla (14.5%) and Grewia bicolor (13.4%) are the most common in the environment. The high values of theoretical density, true density, basal area and overlying cover show that the medium is dominated by woody species of small diameter (5 to 10 cm) with contiguous crowns. Regeneration is dominated by Boscia senegalensis (53%). These results are important in environmental conservation and the implementation of a management plan.  Keywords : Flora, vegetation, botanical special reserve, Noflaye, Senegal

Structure et dynamique de la flore et la végétation de la réserve spéciale botanique de Noflaye (Sénégal)