This work was a literature review of the available data on the plant diversity in protected areas in Niger. It was based on several studies carried out in the period from 2005 to 2021 in nine (9) reserves of Niger. It aimed to assess the current state of the floristic diversity and ecosystem services in these protected areas. The results revealed the information on species richness, ecological spectrums and ecosystems services provided to local population living around these protected areas. A total of 648 plants species, mostly herbaceous, and dominated by Poaceae, were recorded. The spectrum of biological types is dominated by Therophytes (43.57%) and Microphanerophytes (19.07%), which are characteristic of Sahelian vegetation. The chorology revealed a predominance of multi-regional African species and species with a wide distribution. The study highlighted six (6) main categories of ecosystem services for local populations: human food, fodder, traditional pharmacopoeia, energy wood, service wood and craft wood. This review showed that the assessment of plant diversity in the protected area of Niger was far from exhaustive, and much remains to be updated.

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.