Soil erosion, productivity and alternative land use (agroforestry) for soil conservation in the Suke subcatchment, Harerge Region, Ethiopia

agroforesteria agroforesterie agroforestry bassin versant conservation des sols crop losses eau de ruissellement erosion erosion control fertilidad del suelo gestion des eaux highlands land use planification planning runoff water sloping land soil conservation soil fertility terre en pente terreno en declive utilisation des terres water management watersheds