1. Professor, School of Geographical Sciences, Northeast Normal Univ., 5268 Renmin St., Changchun, 130024 Jilin Province, China.
2. Doctoral Student, Geographical Institute, Kiel Univ., Hermann-Rodewald-Str. 9, 24098 Kiel, Germany.
3. Postgraduate Student, School of Geographical Sciences, Northeast Normal Univ., 5268 Renmin St., Changchun, 130024 Jilin Province, China.
4. Lecturer, School of Geographical Sciences, Northeast Normal Univ., 5268 Renmin St., Changchun, 130024 Jilin Province, China (corresponding author). ORCID: .