1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences Beijing China
2. School of Grassland Science Beijing Forestry University Beijing China
3. Department of Geography College of Life and Environmental Sciences, University of Exeter Exeter UK
4. Institute of Biological and Environmental Sciences, University of Aberdeen Aberdeen UK
5. AgResearch Ruakura Hamilton New Zealand
6. College of Agronomy, Nanjing Agricultural University Nanjing China
7. Laboratory for Earth Surface Processes College of Urban and Environmental Sciences, Peking University Beijing P.R. China
8. College of Geography and Remote Sensing, Hohai University Nanjing China