The research on variation of green density and bark percentage of fast-growing eucalyptus for different age

【摘要】：The variation of green density and bark percentage was studied in this paper.The green density was tested by excluding water, and bark percentage was tested by measuring bulk and weighing quality. The research showed that: the green density of fast-growing eucalyptus of five year, six year, seven year was 1.033g/cm3, 1.037 g/cm3,1.036 g/cm3 respectively, and their variation was unremarkable among different age. The bark bulk percentage of five year, six year, seven year was 17.56%、16.29%、13.94% respectively, and their variation was significant among different age. The bark quality percentage of five year, six year, seven year was 18.34%、 14.57%、11.21% respectively, and their variation was significant among different age.