Li Nuyun1,Zhi Ling2,Wang Guosheng3,Li Hongjun4,Hong Jiayi4
1.Wood-based Biomass Energy Management Office of State Forestry Administration,100714,Beijing;2.Southwest Forestry College,650224,Kunming;3.State Forestry Inventory and Planning,100714,Beijing;4.Three North Shelterbelt Bureau of the State Forestry Administration,750001,Yinchuan: China