1. National Hulunber Grassland Ecosystem Observation and Research Station, Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing China
2. Institute of Agricultural Information Chinese Academy of Agricultural Sciences Beijing China
3. State Key Laboratory of Resources and Environmental Information System, Institute of Geographic Sciences and Natural Resources Research Chinese Academy of Sciences Beijing China
4. Center for Global Change and Environmental Observations, Department of Geography, Environment, and Spatial Sciences Michigan State University East Lansing MI USA
5. Climate and Ecosystem Sciences Division Lawrence Berkeley National Lab Berkeley CA USA
6. Sustainable Soils and Grassland Systems Department Rothamsted Research Okehampton UK