马尾松两个木材性状的变异规律和造纸原料林经营措施探讨

本文分析了马尾松管胞长度和木材密度这两个性状在树木个体内不同方向上及个体间的变异趋势,得出了管胞长度在个体高度方向上变异的几种数学模型。方差分析表明,两个性状在个体内的变异程度大于个体之间并且有极显著的统计学差异。同时还建立了胸径处两性状值与株加权平均值间的线性回归方程。讨论了不同年龄,不同林分密度对这两个性状的影响,结果是林分年龄的不同对管胞长度无显著影响,林分密度的不同,在23—24年左右时,对管胞长度有极显著影响。林分年龄和林分密度的不同,对木材密度无显著影响。

Study of Variant Pattern of Two Wood Properties and Management Measures of Pulp Forests for Masson Pine

The variant pattern of tracheid lengnh and wood specific gravity in various directions within a tree and among trees have been discussed and several models that describe variant tendences along the trunk inside a tree have been got. Significant differences of two characters within a tree and among individul trees have been shown by using variance analyses.The differences of those inside a tree have more signifioant than that of those among indiviaul tree. Two characters at D. B. H are liner regression with the weight mean of total a tree sig-nificantly. Also,the effects to these two properties in various stand age and stocking level have been analysed. The results showed that the tracheid length has not significant differences in various stand age and if the stand density varies,it will have significant difference only when the stand age is over 24 years. Thus,the thining practice for pulp forest may be necessary in order to get high quality pulp wood. there are not significant differences between various stand age or stocking level and wood specific gravity.