State Key Laboratory of Grassland Ago-ecosystems, Institute of Arid Agroecology, School of Life Sciences, Lanzhou University,Lanzhou 730000, China;
Research Institute of Highway Ministry of Transport, Beijing 100088, China;
MOE Key Laboratory of Regional Energy and Environmental Systems Optimization, Resources and Environmental Research Academy, North China Electric Power University, Beijing 102206, China;
Institute for Energy, Environment and Sustainable Communities, University of Regina, Saskatchewan S4S 7H9, Canada;
