1. State Key Laboratory of Loess and Quaternary Geology (SKLLQG), and Key Laboratory of Aerosol Chemistry and Physics Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China
2. University of Chinese Academy of Sciences Beijing 100049 China
3. Center for Global Change and Ecological Forecasting School of Ecological and Environmental Sciences East China Normal University Shanghai 200062 China
4. State Key Laboratory of Frozen Soil Engineering, Cold and Arid Regions Environmental and Engineering Research Institute Chinese Academy of Sciences Lanzhou 730000 China
5. Department of Environmental Science, Policy, and Management University of California at Berkeley Berkeley California 94720 USA
6. Institute of Global Environmental Change Xi'an Jiaotong University Xi'an 710049 China
7. Research Institute of Forest Ecology, Environment and Protection Chinese Academy of Forestry Beijing 100091 China
8. School of Life Science Nanjing University Nanjing 210093 China
9. Department of Microbiology and Plant Biology University of Oklahoma Norman Oklahoma 73019USA
10. Center for Earth System Science Tsinghua University Beijing 100084 China