Diversification of products and services from diverse on-farm trees allowed the traditional agroforestry systems of southern Ethiopia to be considered as sustainable farming systems over a timescale of centuries. But their sustainability has been threatened in recent years, owing to the increasing pressure from a rapidly growing population. Investigation of the diverse tree species on agroforestry for various products and services is beneficial to explore the relationships of some farm characteristics with tree species diversity. Very little academic literatures exist on the agroforestry...