集装箱底板用胶合板的生产工艺特点及性能要求

本文通过作者掌握的试验数据及有关资料,简述了集装箱底板用胶合板的特点,并对该产品的质量要求提出了建议。     

阻燃木材应具备的产品性能

本文概述了使用阻燃木材的必要性,论述了传统型和第二代木材阻燃剂的主要差别,讨论了阻燃木材应具备的产品性能,特别是难燃性,吸湿性,强度,使用寿命。     

陕西兰考泡桐木材基本密度株内变异的研究

通过对兰考泡桐木材基本密度水平变异和垂直变异的研究表明,其基本密度的变异由里向外呈抛物线型变化,属ＰａｎｓｈｉｎⅢ;垂直变异从下向上不断增大;距髓心恒定年轮同一植株不同年龄和不同植株同一年龄垂直变异与树干截面平均密度变化相同。     

论阔叶树材的生长轮类型和导管排列

生长轮类型分为环孔材、散孔材和半环孔材（或半散孔材）。１９６１年以来国内的《木材学》教科书及某些书刊上出现了辐射孔材、花样孔材、切线孔材及交叉孔材,这是由于导管的大小和管孔排列两者作为分类依据造成的。木材解剖学中这种特征的混乱需要展开讨论,统一认识,以利于木材解剖学的发展。     

Contribution of active defense responses in the limitation of fungal spread in the sapwood of living sugi (Cryptomeria japonica) tree

The participation of active defense responses in the limitation of fungal spread in the sapwood of living sugi tree was determined. Isolates ofGuignardia cryptomeriae were inoculated to living trees, fresh logs, frozen and thawed logs and autoclaved logs, and the spread of wood discoloration and fungal hyphae was assessed. In autoclaved logs and freeze-treated logs, wood discoloration and reaction zone formation were not observed, and fungal hyphae of both of virulent and avirulent isolates grew rapidly in the wood. In fresh logs, wood discoloration and the formation of a pale reaction zone and transition zone were observed. Virulent isolates spread rapidly, but the spread of avirulent isolates was inhibited. In living trees, wood discoloration was observed and reaction zones were formed at lesion margins. These results indicated that constitutive defense mechanisms had no effect on the spread of both of virulent and avirulent isolates, and that active defense responses were important in the limitation of spread of fungal hyphae, hence in the limitation of wood discoloration. Further, it appeared that avirulent, but not virulent, races ofG. cryptomeriae were easily inhibited even by weak host responses. This study was presented at 105th and 106th Annual Meeting of the Japanese Forestry Society.     

Colorimetry of wood specimens from French Guiana

The color of 97 species of wood specimens from French Guiana was measured on their radial and tangential surfaces with a colorimeter. We obtained the tristimulus values of X, Y, and Z of the 10° standard observer under the illuminant of D ₆₅, and the values of the CIELAB color system, L ^*, a^*, b^*, C^*, and h. When the lightness index (L ^*) was <54, b ^*, C ^*, and h showed positive correlations against L ^*. When L ^* was >54, a ^* and C ^* showed negative correlations against L ^*. These results imply that wood color should be discussed by separating wood specimens into the high and low-lightness groups. A good positive correlation was found between the L ^* and h throughout the whole range of L ^*. It is thought that the value of h can be an important index, as can L ^*, for comparing of wood color because h shows a simple relation with L ^*.     

杨树木材的防腐处理

对采自山东省临沂市１５株杨树的板材和圆木用不同的加压和扩散方法进行防腐处理。依据扩散区的温度,用饱和硼酸溶液对板材进行浸渍—扩散处理６～８周,获得很好的效果;圆木用同样的方法处理,因表面太光滑,防腐剂存留量不足,效果不理想。对己部分干燥的圆木用硼酸进行冷—热槽处理,然后堆垛扩散３周,获得了满意的处理结果,用硼酸进行加压—扩散处理也获得成功。用硼酸和硫酸铜进行双重连续扩散处理,靠瞬间浸渍提供防腐剂,硫酸铜的存留量和渗透量都不足。对气干的板材和圆木用ＣＣＡ进行加压处理,防腐剂的吸收量充分,但渗透不均匀。     

三种阔叶树枝桠材应拉木和对应木的解剖特征及材性的研究

通过对３ 种阔叶树 （米槠、木荷、拟赤杨） 枝桠材的应拉木和对应木的解剖特征及材性的观察和试验,并与正常干材比较, 结果表明： 它们在纤维、导管的长度、宽度、纤维次生壁 Ｓ２ 层纤丝角、化学成分、纤维素相对结晶度、密度、吸水性、涨缩性以及顺纹抗压强度、抗弯强度及其弹性模量等都存在显著差异。     

The observation of log export banning policy in Indonesia: Conditions, problems, and alternative solutions

In 1985, the government of Indonesia declared an export ban on logs in order to promote the wood processing industry within the country. Furthermore, this policy was followed by a regulation that the concessionaires have to build their own industry, causing a great increase in wood industry. In the early period after the log export ban, the government found it to be successful and there were no significant problems. Unfortunately, after one decade, Indonesia’s forestry sector faced some serious problems,i.e. problems in raw material supply which was lower than the log demand level in the industry, deforestation issues, and ecological imbalance. The main objectives of this study are to identify the effects of the log export ban and to introduce some alternate measures.     

Negative gravitropism and growth stress in GA3-treated branches ofPrunus spachiana Kitamura f.spachiana cv.Plenarosea

One of the roles of growth stress in branch shape formation was investigated using a weeping-type Japanese cherry,Prunus spachiana. Negative released strains, caused by longitudinal tensile growth stresses, were detected in the upper side of gibberellin A₃-treated (GA₃-treated) and control branches. The mean value of the released strain in the upper side of the treated branches was –0.104%, which was larger than the value (–0.067%) observed in the control branches. Both branches formed tension wood in the upper side of the xylem, and the treated branches formed tension wood near the pith as well. This suggested that the treated branches generated larger tensile growth stress from the early growth stages. The successive generation of growth stress from the early growth stages was considered to generate forces large enough to bend the branch upward.