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 PR China
2. Center for Ecological and Environmental Sciences, Key Laboratory for Space Bioscience & Biotechnology; Northwestern Polytechnical University; Xi'an 710072 PR China
3. Department for Earth System Science; Tsinghua University; Beijing 100084 PR China
4. Center for Ecosystem Science and Society; Northern Arizona University; AZ 86011 USA
5. Tiantong National Field Observation Station for Forest Ecosystem, School of Ecological and Environmental Sciences; East China Normal University; Shanghai 200062 PR China
6. Center for Global Change and Ecological Forecasting; East China Normal University; Shanghai 200062 PR China
7. Synthesis Research Center of Chinese Ecosystem Research Network, Key Laboratory of Ecosystem Network Observation and Modeling; Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences; Beijing 100101 PR China
8. Department of Emergency Medicine; The University of Colorado Denver; Denver CO 80045 USA
9. Department of Earth and Environmental Sciences; Xi'an Jiaotong University; Xi'an 710049 PR China
10. Institute of Global Environmental Change; Xi'an Jiaotong University; Xi'an 710049 PR China