1. School of Environmental & Safety Engineering, Liaoning Petrochemical University, Fushun, China
2. CAS Key Laboratory of Forest Ecology and Silviculture, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, China
3. Key Laboratory of Vegetation Ecology, Institute of Grassland Science, Northeast Normal University, Ministry of Education, Changchun, China
4. College of Environmental Science, Liaoning University, Shenyang, China
5. Center for Ecological Civilization Research, Chinese Research Academy of Environmental Sciences, Beijing, China