1. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany; Chinese Academy of Sciences; Beijing China
2. University of Chinese Academy of Sciences; Beijing China
3. College of Energy and Power Engineering; Inner Mongolia University of Technology; Hohhot China
4. Department of Ecology and Key Laboratory for Earth Surface Processes of the Ministry of Education; Peking University; Beijing China
5. Department of Botany and Microbiology; University of Oklahoma; Norman Oklahoma USA