【摘要】 日本落叶松是我国东北地区引种和主要造林树种之一 .为了比较日本落叶松优势木和平均木的材性差异 ,在辽宁桓仁国营黑沟林场 17年生日本落叶松林分设置 3个标准地 ,对每木进行调查 ,并采集试材 .按中国国家标准规定的方法取样和测定 .对测定数据作方差分析、线性回归分析和材性比较分析 .结果表明 :该地引种的日本落叶松优势木的木材密度小于平均木的木材密度 ,两者的木材全干干缩率皆随木材密度增大而减小 ;平均木的基本密度、顺纹抗压强度、抗弯强度、抗弯弹性模量等均是南坡向的大于北坡向的 ,优势木的这 4项指标均是南坡向的小于北坡向的 ;优势木的 3项力学强度指标小于平均木 ,平均木的 3项力学强度指标与其基本密度成线性正相关 ,而优势木的各项力学指标与其基本密度既有呈线性正相关的 ,也有呈线性负相关的 ;优势木和平均木的木材干缩比皆随立地指数增大而增大 ,且前者小于后者 ,但后者的木材强重比却高于前者 ,这表明平均木材质优于优势木 .引种材平均木的强重比比日本原产材的高 ,引种材优势木和平均木的全干干缩率比日本原产材的小 .因此 ,引种材的木材适宜实木加工和作建筑用材更多还原

【Abstract】 Larix kaempferi (Lamb.)Carr is one of the most dominant tree species cultivated widely in Northeast China. In order to reveal the differente regularities of wood properties between the preponderant tree and average tree of 17 year old Japanese larch from 3 plots located in Heigou state owned forest farm of Huanren county in Liaoning Province, a survey of the stands of all experimental sites,the collection and processing of sample wood and a survey of all the data and their determination were carried out according to the Chinese National Standard on the methods for wood physical and mechanical properties testing. Meanwhile, the data obtained from experiments were analysed and compared statistically by means of variance analysis and line correlation analysis. The results show that the wood density of preponderant tree is smaller than that of average tree, and the dried shrinkage rate of both trees decrease with the increase of density.The four indexes of basic density, compression strength parallel to grain, static bending strength and modulus of elasticity of average tree in the south side are higher than those in the north side, and inversely, the four strengths’ indexes of preponderant tree in the south were smaller than those in the north.The MOR, MOE, and crushing strength of the preponderant tree are less than those of average tree, and the 3 strengths’ indexes of average tree have a positive line correlation with its basic density, while those of preponderant tree show a positive correlation as well as a negative correlation with its basic density. With the site index increasing, the shrinkage ratio(T/R) is increased for both preponderant tree and average tree, and the former is less than the latter, but the ratio of strength to density of the latter is higher than that of the former. The results indicate that the wood quality of average tree is superior to that of preponderant tree.The ratio of strength to deusity of average tree is higher than that of Japanese tree and the dried shrinkage rate of both preponderant and average trees is smaller than that of Japanese tree. Therefore, wood from preponderant and average trees is suitable for solid timber processing and construction.更多还原