1. State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China
2. College of Resources and Environment, University of Chinese Academy of Sciences, Beijing, China
3. CAS Key Laboratory of Forest Ecology and Management, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
4. Department of Ecosystem and Conservation Sciences, WA Franke College of Forestry and Conservation, University of Montana, Missoula, MT, USA
5. High Meadows Environmental Institute and Department of Ecology & Evolutionary Biology, Princeton University, Princeton, NJ, USA
6. School of Natural Resources, University of Missouri-Columbia, Columbia, MO, USA