火炬松纸浆材化学成分及其在树干高度上的变异规律

对18年生人工林火炬松纸浆材的化学成分含量进行了系统地测试,分析和讨论了火炬松化学成分含量在树干高度方向上的变异规律.结果表明:1、火炬松纸浆材的灰分、冷水、热水、苯醇和1%N aOH抽提物含量,纤维素、戊聚糖和木质素含量平均值分别为0.33%、1.59%、3.21%、2.32%和13.66%、47.98%、15.10%、29.66%;2、沿树干高度方向,火炬松木材灰分含量和纤维素含量变化不明显;热水和苯醇抽提物含量逐渐减小;冷水抽提物和木质素含量表现出先增加后减小或者逐渐减小的趋势;1%N aOH抽提物含量则表现出先减小后增加的趋势;戊聚糖含量表现出逐渐增加或减小的趋势.方差分析表明,火炬松木材各化学成分含量在沿树干高度方向的变化不显著.

Study of Loblolly Pine(Pinus taeda L.)Pulpwood: Its Chemical Components and Variation along Tree Trunk

The chemical component contents of 18-year-old Loblolly pine(Pinus teada L.) pulpwood and its variation along the tree trunk were measured and analyzed.Results show that: 1) the average contents of ash,cold-water extractives,hot-water extractives,benzene-alcohol extractives,1%NaOH extractives,cellulose,pentosan,and lignin are respectively 0.33%,1.59%,3.21%,2.32%,13.66%, 47.98%,15.10%,and 29.66%;2) going upwards from the tree bottom,the change of the contents of ash and cellulose is not significant,the contents of hot-water extractives and benzene-alcohol extractives tend to decrease,the contents of cold-water extractives and lignin tend to decrease gradually or to increase at first and then decrease,the contents of 1%NaOH extractives tend to decrease firstly and then increase,and the content of pentosan tends to decrease or increase.At different heights along the tree trunk,the differences of the chemical component contents of Loblolly pine measured in this study are not significant.