Growth and Biomass of Six-year-old Eucalyptus urophylla Plantation in Leizhou Forestry Bureau

Eucalyptus is an important fast-growing tree for fiber and played vital role in forestry development.The study was conducted on the growth and biomass of six-year-old E.urophylla plantation in Leizhou Forestry Bureau.The results indicated that the tree height and diameter increased with the increasing of tree ages,but the increasing tendency of height became slowly,diameter variation had no big difference.It was feasible to use the study results with good effects by the least square method to estimate the biomass of Eucalyptus urophylla by groups.Biomass obviously increased with the age becoming old and leave biomass increased quickly in the initial stage.The biomass of stem-wood and bark accumulated speedly after three years.In six years old plantations,its biomass of stem-wood was more than half of total biomass,and over 58% of the above-ground biomass.All these results would be taken as an important technical guidance for the cultivation of short-period fiber of E.urophylla.