不同连栽代次桉树木材主要性质的研究

STUDY ON MAIN WOOD PROPERTIES OF EUCALYPTUS 12 ABL W5 WITH DIFFERENT CONTINUOUS PLANTING ROTATION

研究结果显示随着连栽代次的增加 ,胸高形率、胸高形数和高径比等指标逐代升高 ,而干材尖削度则逐代下降 ,表明连栽代次增加 ,立木树干圆满度提高 ,有利于干材的出材率。木材的基本密度随树高部位上升而有递减趋势。木材基本密度和纤维长度则随代次增加而逐代递增。 2、3、4代林木材基本密度分别比1代林增加了 7 3%、1 2 4 %和 1 5 8%。与 1代林相比 ,2、3、4代林干材率分别提高了 1 5 5 %,2 0 7%和2 0 3%。总体来看 ,随着连栽代次的增加 ,木材的基本材性有所改善。

Research results showed that the index of breast height form factor, form quotient and H/DBH ratio increased and the taper of stem decreased, with continuous plating rotation(CPR)increasing, which indicated that the full form index of the standing stem was much better with the CPR increasing and benefited to obtain the outturn percent. In addition,the specific gravity of wood (SGW) decreased with the tree height increasing. SGW and the length of wood fibre increased with CPR increasing. SGW of the 2nd, 3rd and 4th rotation increased by 7 3%, 12 4% and 15 8%, respectively, compared with the 1st rotation. The stem outturn percent of the 2nd, 3rd and 4th rotation increased by 15 5%, 20 7% and 20 3%, respectively, compared with the 1st rotation. In general, the wood quality was improved with CPR increasing.