1. Henan Normal University, Xinxiang 453007, China
2. Ministry of Education Key Laboratory for Western Arid Region Grassland Resources and Ecology, Xinjiang Agricultural University, Urumqi 830000, China
3. Ministry of Education Key Laboratory for Biodiversity Science and Ecological Engineering, Fudan University, Shanghai 200438, China
4. Lanzhou University, Lanzhou 730020, China
5. College of Resources and Environment, Northwest A&F University, Yangling 712100, China
6. Key Research Insititute of Yellow River Civilization and Sustainable Development Collaborative Innovation Center on Yellow River Civilization, Henan University, Kaifeng 475001, China
7. College of Resources and Environmental Sciences, China Agricultural University, Beijing 100193, China