1. College of Economics and Management & College of Horticulture and Architecture Landscape, Heilongjiang Bayi Agricultural University, Daqing, People’s Republic of China
2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany, the Chinese Academy of Sciences, Beijing, People’s Republic of China
3. University of Chinese Academy of Sciences, Beijing, People’s Republic of China
4. Ecological Technical Research Institute, CIECC, Beijing, People’s Republic of China