1. College of Geography and Environmental Science; Northwest Normal University; Lanzhou 730070 China
2. Department of Geography; University of Colorado Boulder; Campus Box 260 Boulder CO 80309-0260 USA
3. UCD School of Biosystems and Food Engineering; University College Dublin; Agriculture and Food Science Centre; Belfield Dublin 4 Ireland
4. Department of Bioresource Engineering; Faculty of Agricultural and Environmental Science; McGill University; Québec H9X 3V9 QC Canada
5. School of Agricultural, Computational and Environmental Sciences; International Centre for Applied Climate Sciences; Institute of Agriculture and Environment; University of Southern Queensland; Springfield Qld 4300 Australia
6. Key Laboratory of Ecohydrology of Inland River Basin; Alashan Desert Eco-Hydrology Experimental Research Station; Cold and Arid Regions Environmental Engineering Research Institute; Chinese Academy of Sciences; Lanzhou 73000 China
7. College of Chemical Engineering; Northwest Normal University; Lanzhou 730070 China
8. College of life sciences; Northwest Normal University; Lanzhou 730070 China