1. South China Botanical Garden, Chinese Academy of Sciences, Guangzhou 510650, China
2. Tokyo University of Agriculture and Technology, Saiwai-cho 3-5-8, Fuchu, Tokyo 183-8509, Japan
3. Forest and Landscape Denmark, University of Copenhagen, Rolighedsvej 23, 1958, Frederiksberg, Denmark
4. Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315, Oslo, Norway
5. College of Life Sciences, Nanchang University, Nanchang 330031, China
6. School of Geography, Beijing Normal University, 19 Xinjiekou Wai Street, Beijing 100875, China