杉木间伐小径材材性试验研究

杉木间伐小径材材性试验结果与成材杉木比较:密度小,晚材率较低,生长较快,吸水性较强;材质为未成熟幼林材种,物理性质较差,力学强度有所降低,作为建筑结构用材时,在设计与施工中必须注意到其强度的降低,采取必要的措施。杉木间伐小径材纤维长度与成材相似,纤维宽度略宽、纤维长宽比值略小,但尚为良好的纤维原料。

An Experimental Study on the Thinning Small-diameter Lumber Properties of Cunninghamia lanceolata Hook

The results of an experiment on the thinning small-diameter lumberproperties of Cunninghamia lanceolata have been obtained. The comparison ofthe thinning small-diameter lumber with the lumber of C. lanceolata is as fol-lows: the density of the former is smaller; the late wood rate of it is lower: itgrows faster: the water-absorbing quality is stronger; the wood quality belongsto the immature young wood sort; the physical properties are relatively poor andthe mechanical intensity reduces to some extent. If it is used as architecturaltimber, the reduction of its intensity must be paid attention to and some neces-sary measures must be taken during the architectural design and construction.The fibre length of the thinning small-diameter lumber is similar to that of thenumber, the fibre width of the former is slightly wide and the fibre ratio oflength to width of it is somewhat small. However, it is still a fine fibre raw ma-terial.