Affiliation: | [1]Center of New Technology Appfication and Research, Ningxia University, Yinchuan 750021, China; [2]State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, the Chinese Academy of Sciences, Beijing 100093, China; [3]College of Recourses and Environment, Ningxia University, Yinchuan 750021, China; [4]Faculty of Forestry and the Forest Environment, Lakehead University, Thunder Bay, Ontario P7B 5E1, Canada |