Variation of Wood Basic Density and Fiber Length of Provenances of Four Eucalyptus Species

Wood basic density and fiber length of 232 5-year-old plants of Eucalyptus (including 45 provenances of Eucalyptus grandis, E. saligna, E. camadulensis and E. urophylla) were tested and analyzed,which were collected from the Eucalyptus Provenance Trial Forest in Changtai County, Fujiaa Province. The results showed that: the variation range of wood basic density of the 4 species of Eucalyptus (E. grandis, E. saligna, E. camadulensis and E. urcphylla) were 0.407~0.462 g/cm3,0.427~0.475 g/cm3,0.498~0.541 g/cm3 and 0.471~0.588 g/cm3 respectively, while that of the fiber length 880.6~994.5 um,859.0~937.8 um, 841.4~924.8 um and 847.9~945.5 um respectively. E. urophylla has the fastest growth speed, the biggest wood basic density and longer fiber length. Among the various provenances, Queensland 14431, Brazil 14860 and South Africa 13365 of E. grandis; New Wales 14527, 13029, 13015 of E. saligna; Queensland 14106, 15052 of E. camadulensis; and Indonesia 12895, 12898 of E. urophylla were the better ones, which had the faster growth speed, better wood basic density and fiber length.