1. School of Environment Northeast Normal University Changchun China
2. State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration Northeast Normal University Changchun China
3. Laboratory for Vegetation Ecology Ministry of Education Changchun China
4. Key Laboratory of Vegetation Ecology Ministry of Education Changchun China
5. College of Geographical Science Inner Mongolia Normal University Hohhot China
6. Inner Mongolia Key Laboratory of Disaster and Ecological Security on the Mongolian Plateau Inner Mongolia Normal University Hohhot China