长梗润楠育苗技术

<正>长梗润楠(Machilus longipedicellata)为樟科润楠属,本属约100种,分布于亚洲热带和亚热带地区,我国约70种,产于长江以南各地,云南有24种。长梗润楠产昆明、武定、罗次、香格里拉,生于海拔2100～2800m的沟谷杂木林中,其木材结构细、纹理直、材质优良,为室内装修、建筑、家具等用材。枝、叶可提取芳香油,种子富含油脂,油供工业用。同时也是云南特有的乡土园林绿化树种。为开发利用好这一珍贵的园林绿化     

原木检验材质评定中的几个难点问题

本文对弯曲、材身边材腐朽和已脱落的劈裂面上的腐朽三种缺陷评等中的难点问题作了探讨,仅供正确评定原木材质参考。     

居家之韩式风情

近年来随着韩剧热播,不仅韩国风格的服装、饰品受到越来越多消费者的欢迎,温馨、清雅的韩式装修风格居室也受到很多人的喜爱。因此,韩式装修风格的含义、特点以及装修要点成为很多消费者最关心的问题。一、韩式风格的特点:     

Study on Balance between Supply and Demand for Timber and Timber Products in China

INTRODUCTION Because China is deficient in forest resources, and the forest has the characteristics of low quality, uneven distribution, slow growth and severe situation of ecological environment, the ecology construction has become the first requirement in society and with the implementation of the “Natural Forest Conservation Program”, Chinese forestry is in the historic transition from timber production to ecological construction. Therefore, the timber production in China increases…     

竹材的采集与加工方法

竹材具有明显的变异性,为了稳定产品的质量,需要统一采集和加工的方法.本文参照国标作法和国际标准（ISO）对毛竹的采集和加工方法作出统一的规定,其中包括竹材的采集地点、采集日期、采集数量、竹龄、竹材的胸径、长度、稍径、竹材的材质,以及竹材的分段方法,竹秆大小端的长径、短径、壁厚、圆度、削尖度提出具体的要求.根据统一方法加工的竹秆变异受到限制.     

Hygroexpansion of wood during moisture adsorption and desorption processes

In order to investigate the shrinking and swelling behavior of wood at a non-equilibrium state, the moisture sorptlon processes of wood under constant and changing conditions were studied. For the static sorption experiment, Chinese fir （Cunninghamia lanceolata） specimens were subjected to the adsorption processes at 25℃, 10 different relative humidity environments and the moisture contents were measured at distinct time intervals of adsorption processes. For the dynamic sorption experiment, the specimens were exposed to periodically and linearly varying relative humidity between 45% and 75% at 25℃. Moisture content as well as radial and tangential dimensional changes in response to the changing relative humidity were measured. The main results from the experiments indicated that： the moisture sorption isotherms of Chinese fir at equilibrium state and different stages of adsorption processes could be characterized by S-shape curves. From the non-equilibrium state to the equilibrium state, the sigmoid moisture sorption isotherms changed from smooth, gradually increasing values to a steep rise at 100% humidity. Furthermore, under dynamic conditions with a constant temperature and a linearly and periodically varying relative humidity, the moisture content as well as radial and tangential dimensional changes of the specimens generally waved but lagged behind the relative humidity change.     

日本落叶松自由授粉家系纸浆材材性遗传变异的研究

对12年生日本落叶松自由授粉子代测定林纸浆材材质性状进行了遗传变异分析、遗传参数估计、相关分析及综合评价和选择。结果表明:家系间综纤维素含量、基本密度、早材和晚材纤维长度、早材和晚材壁腔比差异极显著或显著,10g·L-1NaOH抽出物差异也达10%水平显著。各性状受强度或中等强度的遗传控制,对日本落叶松进行家系水平的材性改良具有很大的潜力。木材密度与早、晚材壁腔比、10g·L-1NaOH抽出物呈显著正相关,与综纤维素含量呈显著负相关,与早、晚材纤维长度相互独立;晚材纤维长度与早材纤维长度存在紧密正相关,纤维长度与早材壁腔比存在显著负相关关系,与晚材壁腔比、综纤维素含量和10g·L-1NaOH抽出物相互独立;综纤维素含量与早材壁腔比呈显著负相关,与晚材壁腔比相关不显著;10g·L-1NaOH抽出物与综纤维素含量、早、晚材壁腔比均相互独立。根据对日本落叶松材质性状的综合评价结果,选出最适合作纸浆林培育的249、340、346、217和364号家系。     

华北落叶松与长白落叶松基本材质材性的研究

按国家标准对河北省木兰围场国有林场管理局华北落叶松和长白落叶松木材基本物理力学性质进行对比试验,结果表明:2种落叶松木材的pH值均呈酸性;长白落叶松的晚材率为29.70%,大于华北落叶松的26.30%;2种落叶松的弦向干缩率均大于径向干缩率,长白落叶松的干缩率略小;长白落叶松的气干密度为0.547g/cm3,略大于华北落叶松的气干密度0.534g/cm3,长白落叶松全干密度为0.413g/cm3,小于华北落叶松的0.419g/cm3;顺纹抗压强度和弹性模量中,长白落叶松为59.0 MPa和11.48GPa,华北落叶松为59.3MPa和12.87GPa,华北落叶松的力学性质较好;华北落叶松管胞的长度为2 490.24μm、宽度为28.45μm、长宽比86.43,略优于长白落叶松管胞长度2 684.42μm、宽度36.12μm、长宽比80.12。通过方差分析可知,2种落叶松管胞宽度差异显著,其余所测木材的材性无显著差异,长白落叶松晚材率较高、干缩稳定性较好、力学性质略小。     

在家享受“木”浴

随着家庭桑拿浴房、木桶浴的流行,木质浴桶受到很多消费者的欢迎。质量上乘的木质浴桶材料天然、款式简单且轻便、保温,既能让沐浴其中的人感受到独特的自然风情,在桶中加入中草药、植物精油或浴盐、芳香花瓣,还能在家悠然SPA,而质量不合格的木质浴桶则会给洗浴带来很多不便。因此,如果你也对木质浴桶感兴趣,就先和我们一起看看如何选购吧!