This study, conducted in the core area of ​​the giraffe's habitat, aims to assess tree species diversity and the demography of the woody stand for the survival and conservation of the species in situ. The floristic inventory, carried out on 154 plots, identified 33 woody species belonging to 25 genera and 15 families. The Fabaceae, Capparaceae, and Combretaceae families are the most dominant, representing 60% of the stand. Tiger scrub is the densest land cover unit, while fields exhibit the highest regeneration rates and diversity indices. The diameter structure reveals a predominance of young individuals and low regeneration potential in tiger scrub and fields; whereas fallow land and shrub steppes show a more balanced and ecologically stable structure. Regarding the vertical structure, it is distinguished by the majority of individuals measuring between 1 and 4 meters in height across all geomorphological units. These results reflect a trend toward biodiversity degradation, marked by the dominance of a few tolerant species (Guiera senegalensis, Combretum micranthum, Annona senegalensis). Urgent conservation and restoration measures are needed to maintain the ecological viability of the habitat of the last remaining giraffes in West Africa.

In Niger, the cumulative effects of successive years of drought and anthropic pressures have resulted in significant declines in the quality and quantity of natural resources. The present study aims to characterize the woody vegetation of the 527261.75ha Dosso Partial Wildlife Reserve. To this end, the analysis highlighted a characterization along the rainfall gradient. Data were collected by radial transect sampling, using floristic surveys and diameter measurements at 1.30 m for trees in 200 plots measuring 50 x 50 m in agrosystems and 50 x 30 m in contracted formations. Diversity indice were calculated on the basis of specific frequencies. The results revealed a woody stand characterized by a floristic richness ranging from 42 to 73 species, with an index varying from 3.86 to 4.74bits. The most dominant families in the sectors are fabaceae (32.87±35.71%) and combretaceae (10.95±19.04%). Microphanerophytes are more abundant (50.7±52.4%), reflecting the shrubby character of this stand. Dendrometric parameters indicate a low stand density (135.8±25.3ft/ha), but with a mean diameter (36.7±9.4cm) and a dominant mean height (11.67m). In the Sudanian and Sahelian domain, the dominant species in terms of importance value index are established. The diametric structure of the individuals fits the Weibull distribution and shows a predominance of young individuals. However, the low proportion of mature individuals suggests, among other things, the existence of anthropic pressures and difficult soil and climatic conditions that prevent individuals from reaching large dimensions. These results provide additional information on the state of the population in the study area, and can be used as a basis for management.