1. Department of Physical Geography, University of Trier, Trier, Germany
2. Soil Erosion and Degradation Research Group, Department of Geography, University of Valencia, Valencia, Spain
3. Técnica y Superior de Ingenieros Agrónomos y de Montes, Universidad de Castilla La Mancha, Albacete, Spain
4. Department of Physical Geography and Geoinformatics, University of Debrecen, Debrecen, Hungary