The recurrence of droughts season in the Sahel, related to rainfall deficits and increasing anthropization, has consequences on the ecosystems production. This drought affects the production of date palms despite its great phenological plasticity (adaptability) to arid zone conditions. The aim of this study is to characterize the population of P. dactylifera L. in the Agadez region for a better knowledge of the ecology of the species and its socio-economic importance. Thus nine (9) villages were prospected on the using of systematic sampling, including three (3) in the municipality of Dabaga, four (4) in Tabelot, one (1) in Tchirozérine, and one (1) in Ingall. In each village, the forest inventories were carried out. These surveys were made along the transects in plots of 50m*50m. A total of 89 plots were prospected and 25 ligneous species belonging to 22 Genus and divided into 15 families were inventoried. The most represented families are: Mimosaceae with seven (7) species (28%), Arecaceae with (8%); Capparaceae (8%); Myrtaceae (8%); Rutaceae (8%) with two (2) species each. The population of P. dactylifera in Agadez is characterized by young trees (with the shape parameter c=3.19), a high IVI (76.71%), a density varying between 36.86 to 194.77 tree/ha, a regeneration rate of 9 to 54% for semis and 25 to 85% stump rejection. This prospective study constitutes a basis in the program for sustainable development of the Aïr palm groves.

Despite their socio-economic and environmental importance, agroforestry parks undergo various pressures which threaten their existence. The study objective is to study the sustainability of agroforestry parks in the municipalities of Gothèye, Tagazar and Torodi in order to find out which of the anthropogenic or climatic factors impacts them most. For this purpose, two types of data were collected, namely dendrometric data through a floristic inventory and rainfall data acquired from the National Directorate of Meteorology. Our results on climate characterization from SPI and their trend have shown the return of favorable (wetter) conditions to vegetation development. Thus, a year of rupture was highlighted by the Pettitt test in 1991 for the municipality of Tagazar, confirming the positive evolution of rainfall. The eight (8) identified parks types are heavely anthropized with an anthropization rate of at least 64% varying from one park to another. The anthropizing factors that weigh the most on these parks are logging (energy and pastoral). The most viable parks are those of Tagazar and Gothèye unlike those of Torodi which are experiencing advanced degradation. Thus, our results suggest that parks are more affected by anthropogenic than climatic actions. For the sustainability of these parks, it is important to take inclusive measures that allow all stakeholders to be involved in the management and exploitation of park resources.

The determination of the impact of the Natural Regeneration Assisted on the avifauna, which is very good indicating of transformation of the landscapes, requires proceeding to its inventory. The present study carried out in the village of Dan Saga in the months from September 2014 and 2015 which a site par excellence of the RNA were for the first time the object of an inventory in order to see the contribution of the Natural Regeneration Assisted on the return of the avifauna. In this direction it was preceded, with an inventory of the avian biodiversity by the combination of the methods of line and not transects. Thus, eight transects were traversed during the two programs of census. It comes out from this study that the village of Dan Saga has a good avian diversity, represented by 29 species of which most frequently observed are pass griseus, Bubalornis albirostris and Petronia dentata. These species set out again in 20 Families. The Kilometric Index of Abundance (KIA) were much more important on Transect of North-West (TNO) and Transect of North (TN) where Faidherbia albida are important; on the other hand Transect of East (TE) presents the weakest IKA. Finally we can say that assisted natural regeneration supports the maintenance and the blooming of avian fauna.