橡胶树生长轮宽度、木材密度变异及其预测模型的研究

VARIATION OF GROWTH RING WIDTH AND WOOD BASIC DENSITY OF RUBBERTREE AND THEIR MODELLING EQUATIONS

本文报道了橡胶树 3个无性系生长轮宽度、木材基本密度和热水浸提物含量变异规律 ,并就橡胶树木材材质改良与资源开发利用进行了讨论。木材基本密度无性系间差异不显著 ,无性系内株间差异显著。PR10 7无性系株内木材基本密度径向上为“递增、稳定”的模式 ,过熟期内木材密度降低 ;纵向上为递增到最大值后减少。株内木材密度变化范围为 0 4 70g·cm- 3～ 0 6 0 5g·cm- 3,变异系数为 3 0 %～ 8 2 %。林分内株间木材基本密度变化范围为 0 4 2 1g·cm- 3～ 0 5 80g·cm- 3,变异系数为 5 16 %～ 7 0 5 %。橡胶木浸提物含量较高 ,株内、株间变化范围为 6 6 5 %～ 11 5 3% ;浸提前木材基本密度与浸提后木材基本密度呈显著的正相关 ;3个无性系生长轮宽度、木材基本密度与树龄的关系模型为 5～ 6次多项式方程 ,相关系数r=0 836 2～ 0 9787。

Variation in growth ring width,wood basic density and hot extracts content of rubbertree were reported in this paper and its wood improvement and processing utilization of its wood resources were also discussed.The significant difference in wood basic density was found between the individuals within clones(DF95,PR107 and PRIM600),but not found among clones.Wood basic density in radial direction within trees of PR107 first increased gradually,levelled off after the 6～7th growth ring and decreased a little within over matured wood near bark.Wood basic density in longitudinal direction within trees augmented from base to top until its maximum,then reduced.Variant range of wood basic density within trees varied from 0 470?g·cm -3 to 0 650?g·cm -1 ,its variant coefficient was within range of 3 0% to 8 2%. Variant range of wood basic density between trees varied from 0 421?g·cm -1 to 0 580?g·cm -3 and its variant coefficient was within range of 5 16% to 7 05%.The hot extracted content of rubberwood was high compared to the others hardwoods and it varied from 6 65% to 11 53% within trees and among trees.The positive correlation equations of extracted wood density with unextracted wood density of three clones of rubbertree were significant at 0 01 level or 0 001 level.Relationship models of growth ring width and wood basic density of rubbertree clones with the tree age were expressed with equations of 5～6 times multinomial.Their relationship coefficients were from 0 8362 to 0 9787.