1. State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry Chinese Academy of Sciences, Guiyang, PR China;
2. College of Resources and Environmental Engineering, Guizhou University, Guiyang, China;
3. College of Geography and Environmental Sciences, Guizhou Normal University, Guiyang, China;
4. Puding Karst Ecosystem Observation and Research Station Chinese Academy of Sciences, Puding, Guizhou Province, PR China