1. State Key Laboratory of Efficient Utilization of Agricultural Water Resources, Institute of Environment and Sustainable Development in Agriculture Chinese Academy of Agricultural Sciences Beijing 100081 China
2. State Key Laboratory of Vegetation and Environmental Change, Institute of Botany Chinese Academy of Sciences Beijing 100093 China
3. College of Forestry Henan Agricultural University Zhengzhou 450002 China
4. Department of Ecology University of Innsbruck Innsbruck 6020 Austria
5. State Key Laboratory of Efficient Utilization of Arid and Semi‐arid Arable Land in Northern China, Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 China
6. Key Laboratory of Arable Land Quality Monitoring and Evaluation, Ministry of Agriculture and Rural Affairs, Institute of Agricultural Resources and Regional Planning Chinese Academy of Agricultural Sciences Beijing 100081 China