1. College of Agronomy Northwest A&F University Yangling China
2. High Meadows Environmental Institute Princeton University Princeton New Jersey USA
3. Center for Ecological Research, Key Laboratory of Sustainable Forest Ecosystem Management‐Ministry of Education Northeast Forestry University Harbin China
4. Department of Biology Indiana University Bloomington Bloomington Indiana USA
5. College of Environmental and Resource Sciences Zhejiang University Hangzhou China
6. State Key Laboratory of Grassland Agro‐Ecosystem, College of Ecology Lanzhou University Lanzhou China
7. International Center for Agricultural Research in the Dry Areas (ICARDA) Rabat Morocco
8. Collage of Agriculture Shanxi Agricultural University Taigu China