台灣主要經濟樹種材質之基礎研究（VII）長尾尖櫧、光腊樹及台灣櫸之比重、收縮率、纖維飽和點之變異性

Studies on the Fundamental Properties of the Economical Tree Species in Taiwan (VII)-The Variability of Specific Gravity, Shrinkage and Fiber Saturation Point of Longleaf Evergreen Chinkapin, Griffith's Ash and Taiwan Zelkova Wood

王松永(Song-Yung Wang) ； 夏榮生(Rong-Sheng Shish)

《林產工業》 9卷2期 (1990/06) Pp. 1-22

https://doi.org/10.6561/FPI.1990.9(2).1

摘要

本研究係探長尾尖櫧、光臘樹及台灣櫸等濶葉樹材在單株內之比重、收縮率、纖維飽和點等性質在樹幹內橫向及軸向的變異性，結果如次：（1）比重在橫向變異性可歸納為四個類型，但在軸向可歸納為兩個類型。（2）橫向收縮率（α_r%，α_t%）在橫向之變異性可歸納為三個類型，但軸向變異性則為兩個類型。（3）縱向收縮率在橫向變異性可歸納為五個類型，但軸向變異性則為兩個類型。（4）纖維飽和點在橫向變異性可歸納為三個類型，而軸向變異性則為兩個類型。（5）徑向及弦向平均收縮率會隨容積密度增加而呈直線狀增大，全收縮率異方性（a_t/a_r）則隨容積密度而呈直線狀減低，其關係各可以（7）（8）及（11）式表示。

關鍵字

長尾尖櫧 ； 光臘樹 ； 台灣櫸 ； 比重 ； 收縮率 ； 纖維飽和點 ； 橫向及軸向變異性

並列摘要

The variations in the transversal and axial direction of physical properties of Longleaf evergreen chinkapin, Griffith's ash and Taiwan zelkova in a single trunk were investigated. The experimental results are summarized as follows: (I) The variation in the specific gravity in the transversal direction can be classified into four types. However, there are two types of variation in the axial direction. (2) The variation of radial and tangential shrinkage % in the transversal direction can be grouped into four types. However, there are two types of variation in the axial direction. (3) The variation of longitudinal shrinkage % in the transversal direction can be expressed by five types. However, there are two types of variation in the axial direction. (4) The variation of Fiber saturation point in the transversal direction can be divided into three types. However, there are two types of variation in the axial direction. (5) The valves of the average shrinkage % in the radial and tangential direction increased linearly with increasing bulk density values. However, the values of anistropy of total shrinkage (αt/αr) showed the contrary trend. Their relationships could be represented by the linear regression equation (7)-(8) and (11).

並列關鍵字

Longleaf evergreen chinkapin ； Griffit's ash ； Taiwan zelkova ； specific gravity ； Shrinkage % ； Fiber satur saturation point ； variation in the transversal and axial direction