1. Chinese Academy of Sciences, Northeast Institute of Geography and Agroecology, Changchun 130012, ChinabUniversity of Chinese Academy of Sciences, Beijing 100049, China
2. Bureau of Land and Resources of Linyi City, Linyi 276000, China
3. Chinese Academy of Sciences, Institute of Geographic Sciences and Natural Resources Research, Beijing 100101, China
4. University of Maryland, Baltimore County, Department of Geography and Environment Systems, Baltimore, Maryland 21250, United States
5. Chinese Academy of Sciences, Northeast Institute of Geography and Agroecology, Changchun 130012, China