台灣主經濟樹種材質之基礎研究（X）台灣杉、杉木及柳杉之吸濕性之變異性

Studies on the Fundamental Properties of the Economical Tree Species in Taiwan (X) The Variability of Absorption Behaviors of Taiwania, China Fir and Japanese Cedar

王松永(Song-Yung Wang)

《林產工業》 9卷3期 (1990/09) Pp. 1-9

https://doi.org/10.6561/FPI.1990.9(3).1

摘要

本報告係探討台灣杉，杉木及柳杉等樹種單株樹幹內吸濕性的變異性，得到次述結果。（1）吸濕平衡含水率在橫向變異性可歸納為兩個類型，即Type 1：由髓心向外側維持一定者。Type 2：由髓心向外側減低者。大部分樹種屬於Type 1。在軸向變異性可歸納為兩個類型，即Type 1：基部較高，而在2/4樹高處較低者。Type2：基部較低，而在2/4樹高處較高者。（2）吸濕平衡含水率有柳杉＞台灣杉＞衫木之趨勢，並有隨氣乾比重而呈直線狀增大。（3）吸濕平均膨潤率在橫向變異性可歸為四個類型，而軸向變異性則為三個組型。

關鍵字

台灣杉 ； 杉木 ； 柳杉 ； 吸濕性 ； 變異性

並列摘要

The variation in the transversal and axial direction of absorption behaviors of Taiwania, China fir and Japanese cedar was investigated. The experimental results are summarized as follows: (1) Variation in the absorption equilibrium moisture content (EMC) in the transversal directions can be summarized into two types, in which Type 1 showed the constant EMC values from pith outward to the bark, and Type 2 showed decreasing EMC values from pith toward the bark. Almost all of the wood specimens belonged to Type 1. However, Variation in the axial direction can be classified into two types, in which Type I showed higher EMC values in the portion of stump wood and the lower EMC values at 2/4 tree height, Type 2 showed lower EMC values in the portion of stump wood and the greater EMC values at 3/4 tree height. (2) The EMC values of three wood species showed the decreasing tendency as follows: Japanese cedar＞ Taiwania ＞ China fir, However, It increased linearly with increasing the values of specific gravity in air condition of wood. (3) Variation in the average swelling %in absorption condition in the transversal direction can be classified into four types. However, three types for axial direction variation.

並列關鍵字

Taiwania ； China fir ； Japanese cedar absorption ； variation in transversal and axial direction