Rongrong Li1, Qiang Wang2,3, Alan McHughen4. 1. School of Business Administration, Xinjiang University of Finance and Economics, Urumqi, Xinjiang, P.R. China. 2. Xinjiang Institute of Ecology and Geography, CAS, Urumqi, P.R. China. 3. China University of Petroleum (East China), Qingdao, P.R. China. 4. Department of Botany &Plant Sciences, University of California-Riverside, California, USA.