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研究了 7～ 8年生雷林 1号桉木材密度及化学成分在株间和株内的变异规律 ,及施肥措施对木材密度及化学成分的影响。径向的变异 ,木材密度和纤维素含量是由髓心向外呈增加趋势 ,分别由髓心处的 0 .50 5g/cm3 (基本密度 )和 42 .88%增加到树皮附近处的 0 .560 g/cm3 (基本密度 )和 44.91 % ;木素及多戊糖含量则呈减小趋势 ,分别由 2 6.54 %和 1 8.0 3 %减小到 2 5.94%和 1 6.55%。树干高度方向的变异 ,木材密度是由基部向上先呈递减趋势 ,而后则增加直到树梢 ;纤维素含量则是稍有增加 ,木素及多戊糖的含量则无明显变化。施肥措施对木材密度和化学成分的影响不明显 ,表明可以通过施肥措施来增加雷林 1号桉木材的生长量 ,而不会影响其木材材性。测试表明 :这种短轮伐期雷林 1号桉木材是优良的造纸原料。
The variation rules of density and chemical composition of Eucalyptus urophylla 1 ~ 7 from 8 to 8 year old were studied in inter-plant and in-plant, and the effects of fertilization on wood density and chemical composition were studied. The radial variation, wood density and cellulose content increased from the medullary center outwardly, increasing from 0 .50 5g / cm3 (base density) and 42.88% at the medullary center to 0 .560 g / cm3 (basic density) and 44.91%, while the content of lignin and pentose decreased from 2 6.54% and 1 8.03% to 2 5.94% and 1 6.55%, respectively. The variation of tree height in the height direction showed that the wood density decreased first and then increased up to the treetop. The cellulose content increased slightly while the content of lignin and pentose did not change significantly. The effect of fertilization on the density and chemical composition of the wood was insignificant, which indicated that the growth of Eucalyptus lignin could be increased by fertilization without affecting its wood properties. Tests showed that: This short rotation period eucalyptus eucalyptus timber No. 1 is an excellent papermaking raw material.