1. College of Chemistry, Chemical Engineering and Resource Utilization, Northeast Forestry University, Harbin 150040, Heilongjiang, P.R. China
2. Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, Heilongjiang, P.R. China
3. Heilongjiang Provincial Key Laboratory of ecological utilization of Forestry-based active substances, Northeast Forestry University, Harbin 150040, Heilongjiang, P.R. China
4. College of Engineering and Technology, Northeast Forestry University, Harbin 150040, Heilongjiang, P.R. China
5. College of Grassland Resources and Environment, Inner Mongolia Agricultural University, Huhhot 010000, Inner Mongolia, P.R.China
6. Key Laboratory of Grassland Resources, Ministry of Education P.R. China