Affiliation: | (1) Department of Biology, Faculty of Science, Addis Ababa University, P.O. Box 30193, Addis Ababa, Ethiopia;(2) Present address: Department of Forest Soils, Swedish University of Agricultural Sciences, P.O. Box 7001, 750 07 Uppsala, Sweden;(3) Wondo Genet College of Forestry and Natural Resources, Hawassa University, P.O. Box 128, Shashemene, Ethiopia |