1. School of Soil and Water Conservation Beijing Forestry University Beijing China
2. Jixian National Forest Ecosystem Observation and Research Station, CNERN, School of Soil and Water Conservation Beijing Forestry University Beijing China
3. Division of Hydrologic Sciences Desert Research Institute Las Vegas Nevada USA
4. Department of Didactics of Mathematics, Social and Experimental Sciences, Faculty of Education Sciences University of Malaga Malaga Spain
5. Departamento de Análisis Geográfico Regional y Geografía Física, Facultad de Filosofía y Letras Campus Universitario de Cartuja, University of Granada Granada Spain