1. Key Laboratory for Agricultural Soil and Water Engineering in Arid Area of Ministry of Education, Northwest A&F University, Yangling, Shaanxi 712100, PR China
2. Institute of Water Saving Agriculture in Arid Regions of China, Northwest A&F University, Yangling, Shaanxi 712100, PR China
3. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling, Shaanxi 712100, PR China