1. National Ecosystem Science Data Center, Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2. Institute of Ecological Conservation and Restoration, Chinese Academy of Forestry, Beijing 100091, China
3. Institute of Desertification Studies, Chinese Academy of Forestry, Beijing 100091, China
4. USDA Forest Service, Rocky Mountain Research Station, Missoula, MT 59801, USA