1. Shaanxi Key Laboratory of Earth Surface System and Environmental Carrying Capacity, College of Urban and Environmental Science, Northwest University, Xi’an 710127, China
2. Key Laboratory of Watershed Geographic Sciences, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
3. School of Chemistry and Chemical Engineering, Lanzhou City University, Lanzhou 730070, China
4. Shaanxi Environment Investigation and Assessment Center, Xi’an 710054, China