The pastoral ecosystems of the tropical countries are confronted with enormous constraints related on climatic variabilities and the degradation of the pastures. This article aims at studying the dynamics of the pastoral course in conditions of variabilities climatic in the Benign Center and Northern. The climatic data of 1965 to 2016 of the pluviometry stations and synoptic stations of the zone of study were used. The cuts of biomass built in 48 plots of phytosociological statements made it possible to obtain the productivities of the types of pasture. The multivariate analysis carried out thanks to the software “R” based on the climatic and anthropic variables made it possible to know the impacts related to the anthropic disturbances on the habitats of the plants. The got results show a trend in fall of pluviometry, unequally distributed, of 1955 to 2016 in the zone of study. However, the surplus rainy decades (55,55%) took a preponderance on those overdrawn (44,44%) during the last 46ans. The strong positive anomalies of precipitations are recorded during the decades 1960.1990 and 2000. The strongest negative anomalies are observed at the start of 1970 and 1980. The maximum temperatures vary according to the various synoptic stations. The specific wealth in savannas is correlated with the weak disturbances and pluviometry; while this correlation is strongly high in grassy savanna. This specific wealth varies by commune and year with a higher with Pehunco in 1997 and lower value with Kerou in 2016.

Urban growth in the Abomey and Bohicon has led to a real metamorphosis of these spaces. This transformation has spawned the urban sprawl whose manifestation and the factors are necessary for the understanding for a sustainable management of these territories. This research contributes to the knowledge of urban sprawl between Abomey and Bohicon territories. The methodology combined both quantitative and qualitative approaches. A sample of 944 people was constituted in both territories. The collected data are processed from statistical and spatial analysis and the computation of urban sprawl indicators. These various indicators show that the suburbs of Abomey and Bohicon are dynamic between 1992 and 2002 with a regular spread from the center towards the periphery marked by a more or less strong intensity between 2002 and 2013. The settlement of the populations is explained by the geographical position and the crossing of the tracks connecting the hinterland by these territories. The pedology, relief, climate, varied and diversified structuring services, political decisions, land and real estate contribute intensively. The correspondence analysis of factors reveals that the low environmental pollution, the inheritance, the land tenure are the main motivations of installation in the peripheries whereas those of the town centers are the proximity of the service or a market, the subdivision of the middle, the presence of water, electricity and security. This growing facility needs to meet the challenges imposed by this urban sprawl to ensure efficient management of these spaces for future generations.