Impacts of forest banquettes and half-moons on the physicochemical characteristics of the soil and spontaneous plant diversity in western Niger

Forest banquettes and half-moon techniques associated with plantations of woody species are commonly used in Niger to restore degraded lands. To assess the impacts of these anti-erosion structures on the physicochemical characteristics of the soil and plant diversity, an expimental study was carried out in the rural commune of Simiri on a plateau site fitted out with a forest banquette and a glacis site with forest half-moons. An undeveloped control zone was considered for each restoration site. The soil moisture at the structures was regularly recorded for 30 months. Soil samples under the crown of the planted plants were taken and analyzed in the laboratory. A floristic inventory of spontaneous species was carried out on restoration sites and control areas. Finally, the herbaceous biomass was evaluated. It emerges from this experiment that forest benches and half-moons significantly improve soil moisture and texture as well as organic carbon under the crown of planted plants. These conditions allowed the development of spontaneous plant diversity. These results highlight the effectiveness of forest banquettes and half-moons in restoring degraded lands of plateaus and glacis.