1. State Key Laboratory of Soil Erosion and Dryland Farming on the Loess Plateau Northwest A&F University Yangling Shaanxi China
2. Research Center of Soil and Water Conservation and Ecological Environment, Ministry of Education, Chinese Academy of Sciences Yangling China
3. University of Chinese Academy of Sciences Beijing China
4. Department of Forest Resources University of Minnesota St. Paul Minnesota USA
5. Institute for Global Change Biology University of Michigan Ann Arbor Michigan USA
6. CAS Center for Excellence in Quaternary Science and Global Change Xi'an Shaanxi China