1. Graduate Student, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 South Zhongguancun Rd., Beijing 100081, China; College of Water Resources and Civil Engineering, China Agricultural Univ., 17 East Tsinghua Rd., Beijing 100038, China.
2. Research Professor, Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, 12 South Zhongguancun Rd., Beijing 100081, China (corresponding author).
3. Professor, College of Water Resources and Civil Engineering, China Agricultural Univ., 17 East Tsinghua Rd., Beijing 100038, China.
4. Senior Engineer, State Key Laboratory of Simulation and Regulation of Water Cycle in River Basin, China Institute of Water Resources and Hydropower Research, 20 West Chegongzhuang Rd., Beijing 100048, China.