1. College of Resources and Environment, Key Laboratory of Agri-food Safety of Anhui Province, Anhui Agricultural University, Hefei 230036, PR China
2. Institute of Environment and Sustainable Development in Agriculture, Chinese Academy of Agricultural Sciences, Beijing 100081, China
3. College of Agronomy and Biotechnology, China Agricultural University, Beijing 100094, China
4. Canadian Light Source Inc., University of Saskatchewan, Saskatoon SK S7N 2V3, Canada
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