1. Postdoctoral Programme of BLY Landscape and Architecture Planning and Design Institute, Beijing Forestry University, Shenzhen, China
2. Beijing Forestry University, Beijing, China
3. College of Life Science and Technology, Gansu Agricultural University, Lanzhou, China
4. Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau of Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou, China