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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
Japan larch is one of the introduction and main afforestation species in northeastern China.In order to compare the differences of wood properties between the dominant and the average larch in Japan, three standards were set in the 17-year-old Larix chinensis forest stand in Hailin Forest Farm, Liaoning Huanren, The wood samples were collected and the test samples were collected.The samples were taken and determined according to the method of Chinese national standard.Analysis of variance, linear regression and comparative analysis of the materials were carried out on the measured data.The results showed that the dominant larch species Of the wood density is less than the average wood density of the wood, both wood dry shrinkage rates are reduced with the increase of wood density; the average density of wood, the parallel compressive strength, flexural strength, flexural modulus All of them are greater than the north slope toward the south slope, and the four indicators of the dominant wood are less than the north slope toward the south slope. The three mechanical strength indexes of the dominant wood are less than the average wood and average mechanics of the wood The strength index is linearly correlated with its basic density, while the mechanical indexes of the dominant wood are both linearly and linearly negatively correlated with their basic density. The wood of the dominant wood and the average wood Wood shrinkage ratio of wood increased with increasing site index, and the former was smaller than the latter, but the latter had higher wood weight ratio than the former, indicating that the average wood quality is superior to the dominant wood. Bibi than the Japanese origin of raw materials, the introduction of superior wood and wood average dry shrinkage rate than the Japanese origin of small. Therefore, the introduction of timber suitable for solid wood processing and construction materials