1. Key Laboratory of Economic Plant Resources Development and Utilization in Shaanxi Province, College of Forestry, Northwest A & F University, Yangling, Shaanxi, China;
2. Hunan Research Center of Engineering Technology for Utilization of Environmental and Resources Plant, Central South University of Forestry and Technology, Changsha, Hunan, China;
3. School of Material and Chemical Engineering, Hunan City University, Yiyang, Hunan, China