1. Key Laboratory of Alpine Ecology, Institute of Tibetan Plateau Research Chinese Academy of Sciences Beijing China
2. College of Earth and Environmental Sciences; MOE Key Laboratory of Western China's Environmental System Lanzhou University Lanzhou China
3. Key Laboratory of Ecogeochemistry, Ministry of Natural Resources National Research Center of Geoanalysis Beijing China
4. Department of Geology and Environmental Sciences University of Pittsburgh Pittsburgh PA USA
5. State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences Wuhan China