1. College of Grassland Sciences, Xinjiang Agricultural University, Urumqi, China
2. College of Information Science and Technology, Zhongkai University of Agriculture and Engineering, Guangzhou, China
3. College of Agricultural, Xinjiang Agricultural University, Urumqi, China
4. College of Resource and Environment, Xinjiang Agricultural University, Urumqi, China
5. Faculty of Land and Resources Engineering, Kunming University of Science and Technology, Kunming, China