1. College of Geography and Environmental Science, Henan University, Kaifeng, China
2. College of Geography and Environmental Science, the Key Laboratory of Geospatial Technology for the Middle and Lower Yellow River Regions (Henan University), Ministry of Education, Xinyang Academy of Ecological Research, Henan Dabieshan National Field Observation and Research Station of Forest Ecosystem, Henan University, Kaifeng, China
3. Department of Geography, University of California, Los Angeles, CA, USA