1. School of Geography, Nanjing Normal University, Nanjing 210023, China
2. Jiangsu Center for Collaborative Innovation in Geographical Information Resource Development and Application, Nanjing 210023, China
3. Jiangsu Engineering Research Center for Soil Utilization & Sustainable Agriculture, Nanjing 210023, China
4. Soil Science Department, Faculty of Agriculture, Zagazig University, Zagazig 44511, Egypt
5. Institute of Plant Ecology, Justus Liebig University Giessen, Heinrich-Buff-Ring 26, Giessen 35392, Germany
6. School of Biology and Environmental Science and Earth Institute, University College Dublin, Dublin 4, Ireland