1. College of Education for the Future Beijing Normal University at Zhuhai Zhuhai China
2. Department of Geographic Science Faculty of Arts and Sciences Beijing Normal University at Zhuhai Zhuhai China
3. College of Geographical Science Inner Mongolia Normal University Hohhot China
4. School of Geographical Sciences Northeast Normal University Changchun China
5. Key Laboratory of Geographical Processes and Ecological Security of Changbai Mountains Ministry of Education Changchun China