1. Ph.D. Candidate, College of Water Resources and Architectural Engineering, Northwest A&F Univ., No. 23, Wei Hui Rd., Yangling, Shaanxi 712100, PR China.
2. Professor, Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education, College of Water Resources and Architectural Engineering, Northwest A&F Univ., No. 23, Wei Hui Rd., Yangling, Shaanxi 712100, PR China (corresponding author).
3. Graduate Research Student, College of Water Resources and Architectural Engineering, Northwest A&F Univ., No. 23, Wei Hui Rd., Yangling, Shaanxi 712100, PR China.