1. School of Energy and Power Engineering, Lanzhou University of Technology, Lan Zhou, Gansu, China
2. School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China
3. Lhasa National Ecological Research Station, Key Laboratory of Ecosystem Network Observation and Modelling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, China
4. School of Petrochemical Engineering, Lanzhou University of Technology, Lanzhou, Gansu, China