疏伐對於柳杉實生苗與插條苗林木之生長與性質影響研究（第三報）－木材之靜曲性質

Studies on the Effect of Thinning on the Growth and Properties of Cryptemeria Wood Originated from Seed Plant and Vegetative Plant in Taiwan (III) The Bending Behavior of Wood

玉松永(Sang-Yung Wang) ； 楊榮啟(Yang-Chi Yang)

《林產工業》 3卷1期 (1984/03) Pp. 2-10

https://doi.org/10.6561/FPI.1984.3(1).1

摘要

本研究目的是探討A，B，C，D等四種疏伐方法對於柳杉實生苗與插條苗林木之木材氣乾比重及靜曲性質的影響。所得結果如次：（1）相同林木內疏伐度間，其氣乾比重並無顯著性差異。但實生苗與插條苗林木間，氣乾比重有顯著性差異，在B種與C種疏伐度之場合，是以實生苗木材較插條苗木材為大。（2）相同木材內疏伐度間，其靜曲強度（MOR or σb）及靜曲彈性係數（MOE- or E_b）變異分析結果，雖然均無顧著性差異，但實生苗與括條苗林木內，在B種及C種疏位度之場合，實生苗木材的σ_b及E_b較插條苗木材為大。

並列摘要

The Purpose of this study is to study the effect of thinning on the specific gravity and bending behavior of Cryptomeria wood originated from seed plant and vegetative plant. The results are summarized as follows: (1) The air dry specific gravity of Cryptomeria wood was similiar between thinning within trees, but it had significant difference between the trees or iginated from seed plant and vegetative plant, In the case of B- and C-thinning, the air dry specific gravity of Cryptomeria wood seed plant was greater than that of vegetative pIant. (2) The bending strength (MOR or σ_b) and modulus of elasticity in bending (MOE or E_b) showed similar between thinnings within trees by the analysis of variance, but in the case of B- and C- thinnings, both the σ_b and E_b of Cryptomeria wood of seed plant were greater than that of vegetative plant.