1. College of Resources and Environmental Engineering, Guizhou University, Guiyang 550025, P.R. China
2. Key Laboratory of Karst Georesources and Environment (Guizhou University), Ministry of Education, Guiyang 550025, P.R. China
3. Guizhou Karst Environmental Ecosystems Observation and Research Station, Ministry of Education, Guiyang 550025, P.R. China
4. School of Environmental Science and Engineering, Guangdong Provincial Key Lab of Environmental Pollution Control and Remediation Technology, Sun Yat-sen University, Guangzhou, 510275, P.R. China