1.Agricultural Environment and Resource Research Centre,Northeast Agricultural Research Centre of China,130124,Changchun;2.Academy of Forestry
Inventory and Planning,State Forestry Administration,100714,Beijing;3.Forestry Centre of Jinjiagou,Luanping County,068257,Luanping,Hebei;4.Agricultural University of Hebei,071000,Baoding,Hebei: China