1. State Key Laboratory of Herbage Improvement and Grassland Agro-Ecosystems, College of Ecology, Lanzhou University , Lanzhou 730000 , China
2. Department of Civil and Environmental Engineering, Massachusetts Institute of Technology , Cambridge , MA 02139 , USA
3. Instituto Multidisciplinar para el Estudio del Medio “Ramón Margalef,” Universidad de Alicante , Alicante 03690 , Spain
4. Institut de Biologia Evolutiva (CSIC-UPF) , Barcelona 08003 , Spain
5. Departamento de Ecología, Universidad de Alicante , Alicante 03690 , Spain
6. School of Urban Planning and Design, Peking University Shenzhen Graduate School, Peking University , Shenzhen 518055 , China
7. CSIC, Global Ecology Unit CREAF-CSIC-UAB , Barcelona 08193 , Spain
8. CREAF , Cerdanyola del Vallès, Barcelona 08193 , Spain
9. High Meadows Environmental Institute, Princeton University , Princeton , NJ 08544 , USA