1. Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun, China
2. University of Chinese Academy of Sciences, Beijing, China
3. Department of Plant and Environmental Sciences, Faculty of Science, University of Copenhagen, Taastrup, Denmark
4. Institute of Agricultural Resources and Environment, Jilin Academy of Agriculture Sciences/State Engineering Laboratory of Maize, Changchun, China