1Graduate Univ., Chinese Academy of Sciences, Beijing, 100039 China
2Key Lab. of Water Cycle and Related Surface Processes, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101 China
3Institute of Soil And Water Conservation, Chinese Academy of Sciences, Ministry of Water Resource, Yangling, 712100 Shaanxi, China
4State Key Lab. of Soil Erosion and Dryland Farming on the Loess Plateau Institute of Soil and Water Conservation, Northwest A & F Univ
5Lab. of Soil Physics, Center for Nuclear Energy in Agriculture Univ. of São Paulo CEP 13418‐900, CP 96 Piracicaba SP Brazil