1. Professor, College of Water Conservancy and Civil Engineering, Center for Agricultural Water Research in China, China Agricultural Univ., Beijing 100083, China (corresponding author).
2. Lecturer, College of Water Conservancy and Civil Engineering, China Agricultural Univ., Beijing 100083, China.
3. Graduate Student, College of Water Conservancy and Civil Engineering, China Agricultural Univ., Beijing 100083, China; and, Associate Professor, Shandong Agricultural Univ., Shandong, Taian 270111, China.
4. Graduate Student, College of Water Conservancy and Civil Engineering, China Agricultural Univ., Beijing 100083, China.