1. Department of Land Resources Management and Environmental Protection; Mekelle University; P.O. Box 231 Mekelle Ethiopia
2. Department of Earth and Environmental Sciences; KU Leuven; Celestijnenlaan 200E B-3001 Leuven Belgium
3. Département de Géographie; Université de Liège; Clos Mercator 3 4000 Liège Belgium
4. Georges Lemaitre Center for Earth and Climate Research; Earth and Life Institute, Universite Catholique de Louvain; B-1348 Louvain-la-Neuve Belgium
5. Soil Physics and Land Management Group; Wageningen University; P.O. Box 47 6700AA Wageningen The Netherlands
6. Department of Geography; Ghent University; B-9000 Ghent Belgium
7. International Platform for Dryland Research and Education; Tottori University; Tottori Japan