1. College of Economics and Management, Northwest A&F University, Yangling 712100, China
2. College of Innovation and Experiment, Northwest A&F University, Yangling 712100, China
3. College of Grassland Agriculture, Northwest A&F University, Yangling 712100, China
4. College of Water Resources and Architectural Engineering, Northwest A&F University, Yangling 712100, China
5. Wujinglian School of Economics, Changzhou University, Changzhou 213000, China
6. Institute of Management Engineering, Qingdao University of Technology, Qingdao 266525, China