1. Key Laboratory for Forest Resources Conservation and Utilization in the Southwest Mountains of China, Ministry of Education, Southwest Forestry University, Kunming, P.R. China
2. Department of Medicinal Plant, School of Forestry, Southwest Forestry University, Kunming, P.R. China
3. Department of Applied Chemistry, School of Chemistry and Environment Science, Shaanxi University of Technology, Hanzhong, P.R. China