1. School of Geographic Sciences Xinyang Normal University Xinyang Henan China
2. State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment, CAS Xi'an Shanxi China
3. Key Laboratory for Subtropical Mountain Ecology (Ministry of Science and Technology and Fujian Province Funded), College of Geographical Sciences Fujian Normal University Fuzhou Fujian China
4. Department of Environment and Geography Macquarie University Sydney New South Wales Australia