1. School of Life Sciences, Central China Normal Univ., Key Laboratory for Geographical Process Analysis and Simulation Wuhan Hubei Province P. R. China
2. Bio‐resources Key Laboratory of Shaanxi Province, Shaanxi Univ. of Technology Hanzhong Shaanxi Province P. R. China
3. School of Life Sciences, Lanzhou Univ. Gansu Province P. R. China
4. Administration of Gansu Anxi Extra‐Arid Desert National Nature Reserve Gansu Province P. R. China