1. Department of Agroecosystem Research; BayCEER; University of Bayreuth, Bayreuth, Germany
2. Institute of Geobotany; University of Halle, Halle, Germany
3. Institute of Soil Science; Leibniz Universität Hannover, Hannover, Germany
4. Key Laboratory of Ecosystem Network Observation and Modelling; Institute of Geographic Sciences and Natural Resources Research; Chinese Academy of Sciences; Beijing; 100101; China
5. MOE Key Laboratory of Arid and Grassland Ecology; School of Life Sciences; Lanzhou University; Lanzhou; Gansu Province; 730000; China
6. Faculty of Geography; Philipps-Universität Marburg, Marburg, Germany