1. State Key Laboratory of Grassland Agro‐ecosystemsSchool of Life SciencesLanzhou University Lanzhou China
2. Key Laboratory of Vegetation EcologyMinistry of EducationInstitute of Grassland ScienceNortheast Normal University Changchun China
3. College of Life SciencesShihezi University Shihezi China
4. Ecological Remote Sensing DepartmentSatellite Environment CenterMinistry of Environmental Protection of China Beijing China