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題 名 | 造林木材質之組織特性與力學性質的評價(1)--柳杉、杉木之組織特性與力學性質=Evaluation of the Tissue Characteristics and Mechanical Properties of Wood from Man-Made Forest(Ⅰ)--The Tissue Characteristics and Mechanical Properties of Japanese Cedar and China Fir |
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作 者 | 張義雄; 陳柏璋; 陳周宏; | 書刊名 | 國立中興大學實驗林研究彙刊 |
卷 期 | 19:1 1997.03[民86.03] |
頁 次 | 頁35-51 |
分類號 | 436.18 |
關鍵詞 | 造林木; 組織特性; 力學性質; 評價; 柳杉; 杉木; Man made forest; Tissue characteristic; Mechanical Properties; Evaluation; Japanese cedar; China fir; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究係探討柳杉、杉木造林木之管胞特性、基本物理及力學等性質,供作商 品評價時之參考,主要結果如次: 1.二種樹種生長輪的平均寬度在2∼5mm之間,二樹種間無顯著差異。但優勢木與劣勢 木間的生長量有差異。2.管胞長為2∼4mm間。管胞長度隨著年齡的增長趨勢呈現出對 數型的生長模式。優勢木與劣勢木間之管胞長度差異不顯著。3.優勢木之平均密度均較劣 勢木小,另柳杉之密度較杉木大。4.各樹種之生材含水率均與密度呈反比,其相關性於優 勢木較劣勢木高。5.收縮率無論樹種或部位均是以弦向收縮率最大,徑向次之而縱向則最 小。另劣勢木在弦向或徑向之收縮率,均較優勢木者大。而在弦向與徑向之異方性則是以優 勢木較大。6.靜曲性質則無論是破壞係數或彈性係數之平均值,會有劣勢木比優勢木高之 現象。另與密度間之關係成正比。7.在橫向及縱向的力學性質變化不易找出固定的模式, 各性質間會隨樹種或取材部位而有不同之變化。 |
英文摘要 | The purpose of this study is to investigate the characteristics of tracheids, basic physical and mechanical properties of Japanese cedar and China fir from man-made forest to evaluate the commercial value. The results are summarized as follows: 1.The average widths of their growth rings are 2-5mm. There is no significant difference between these two species. Significant difference on the average widths of growth rings is found between the dorminant and subdorminant trees. 2.The length of their tracheids are 2-4mm. Tracheid length has a tendency to increase with age is displayed as the curves of growth model. There is no significant difference between those of the dorminant and subdorminant trees. 3.The density of the wood from dorminant trees is smaller than that of the subdorminant trees. The density of wood of Japanese cedar is larger than that of China fir. 4.The moisture content of green wood in both two species are negatively correlated with density. Their correlationship in dorminant trees is higher than subdorminant trees. 5.The tangential shrinkage is larger than the radial's, and the longitudinal shrinkage is the smallest. Both tangential and radial shrikage of the wood from subdorminant trees are larger than that of the wood from dorminant trees. The anisotropy is more evident in the wood from subdorminant trees. 6.The modulus of rupture(MOR) and modulus of elasticity(MOE) of static bending properties of wood from subdorminant trees are larger than that from the dorminant trees. Both MOR and MOE are positively correlated with density. 7.No variation model of mechanical properties of wood for either longitudinal or radial direction can be found. The mechanical properties vary between species and among locations within trees. |
本系統中英文摘要資訊取自各篇刊載內容。