1. Instituto de Geomorfología y Suelos, Dep. of Geography Univ. of Málaga 29071 Málaga Spain
2. Physical Geography Trier Univ. 54286 Trier Germany
3. Soil Physics and Land Management Group Wageningen Univ. Droevendaalsesteeg 4 6708PB Wageningen The Netherlands
4. Civil, Surveying and Environmental Engineering The Univ. of Newcastle Callaghan 2308 Australia
5. Soil Erosion and Degradation Research Group, Dep. of Geography Univ. of Valencia 46010 Valencia Spain