Analysis of sawn lumber production from logging residues of branchwood of <Emphasis Type="Italic">Aningeria robusta</Emphasis> and <Emphasis Type="Italic">Terminalia ivorensis</Emphasis>

One way of meeting the supply demands of the wood industry is through the reduction of waste in timber processing. It has been estimated in Ghana that for every tree felled, nearly 50% of the tree volume is left in the forest in the form of branches, crownwood, and stumps. In this study, the potential of utilizing branchwood as raw material from logging residues to help meet the timber demands of the downstream processing sector was analyzed experimentally. The sawing characteristics of the branchwood of Aningeria robusta and Terminalia ivorensis with diameters in the range 10–25 cm using live sawing and cant sawing methods were determined using a randomized complete block design, 2 × 4 factorial with three replications. Experimental results indicate that, the relative lumber value yields for first and second grade boards of A. robusta and T. ivorensis branches were 25 and 20%, respectively, while the green lumber volume yields were 40 and 32%, respectively. A high proportion of sapwood and the occurrence of washboarding in T. ivorensis contributed to that species’ relatively low lumber value and volume yield. The experimental results further indicate that the sawing technique used had no significant influence on lumber yields. However, at 5% level of significance, significant differences in lumber yield existed between some of the diameter classes.     

红松林木生长轮材质预测的研究

生长轮材质预测属于新兴的学科,主要是通过生长轮材质分析法,寻求林木生长中生态条件的变化与木材材质变化的相互关系。本文描述了红松树枝与树干材质的变化过程,以数量化的模式揭示了它们的相关性,为用树枝预测树干材质开辟了新的途径。试材取自辽宁草河口解放林(4株),吉林土们岭张二北沟(4株),每株树木在枝下高处、1/2枝下高、1.3 m胸高处截取厚10 cm圆盘各三个,以此进行生长轮材质分析测定。试验结果借助数量化理论Ⅰ模式,得出综合相关方程。     

马尾松枝桠材应压木与对应木的化学及物理力学性质研究

研究了马尾松枝桠材中的应压木和对应木的化学、物理及力学性质．并与正常干材对比。结果表明：它们在化学组分、纤维素相对结晶度、密度、胀缩性、吸水性、顺纹抗压、抗弯强度及其弹性模量等方面存在明显的差异。