1. Department of Biological sciences, Jaramogi Oginga Odinga Univeristy of Science and Technology, Bondo, Kenya
2. Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi, China
3. State Key Laboratory of Desert and Oasis Ecology, Graduate University, Chinese Academy of Sciences, Beijing, China
4. Faculty of Agriculture, Shizuoka University, Shizuoka, Japan