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題名 | Anatomical Properties of Taiwan Giant bamboo and Moso Bamboo=麻竹與孟宗竹之解剖性質 |
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作 者 | 謝榮生; 吳順昭; | 書刊名 | 國立臺灣大學農學院研究報告 |
卷期 | 31:3 1991.09[民80.09] |
頁次 | 頁58-75 |
分類號 | 436.183 |
關鍵詞 | 孟宗竹; 麻竹; 解剖; |
語文 | 英文(English) |
中文摘要 | 麻竹與孟宗竹為本省鞍生竹類及單桿竹類之二種代表經濟竹種,使得其 所表現出之物理與機械性質均有所差異,故本研究針對二種竹材之解剖性質加以 探討,各項結果分述如次:竹壁、竹青、竹黃三者厚度由竹稈基部往梢部減小, 橫切面單位面積維管束個數在由竹璧外側往內側減少,竹青部位約7-10個,在距 竹青4-5mm後,二竹種之維管束均保持在1-2個。導管直徑之縱向變異,麻竹以第 10節間直徑最大,孟宗竹則以梢部較大。竹壁橫向纖維長以竹青附近最短,縱向 變異則以以稈基部較短,在10-18節間達最大。單一節間內則以節都最短,節間 中央部位纖維最長。纖維率以竹青處最高,內側最低。比重以竹青處最大,往竹 壁內側移動比重漸次減低至竹黃處再增大,而竹稈縱向比重以稈基部最小,隨稈 高之增加而增大,其比重隨竹齡之增加亦增大,直到竹材成熟。 |
英文摘要 | Taiwan giant and Mo so bamboos are the typically economical bamboospecies of pachymorph and leptomorph type rhizomes in Taiwan. Theanatomical properties of both bamboo species were examined in this paper, The thickness of culm wall, epidermal layer and inner culm wall decrease from the base to the top of bamboo culm. The numbers of vsacular bundleper square mm decrease from the outer part to the inner part of culmwall and maintain one to two bundles after 4 to 5 mm from the outer part. The largest vessel diameter of Taiwan giant bamboo and Moso bamboooccur in the 10th intermode and the top of culm respectively. The shortestfiber length in the cross section in the epidermal zone, while in thelongitudinal direction the smallest value was found between the 10th and18th internode. Within one internode, the shortest one shows in the nodeand the longest is in the middle part of the internode. The highestpercentage of fiber displays in the outmost part of the culm and thelowest is near the innermost. The ratio is about one half, one third andone fourth at outer, middle and inner part of the culm for Taiwan giantbamboo, and one half, one fourth and one seventh of Moso bamboo. Thehigh specific gravity occurs at the peripheral layer and decreases towardone half or one third of the culm wall and increases further toward thepith cavity. Along the axis of the culm the lower specific gravity is at thebase and increase toward the top of the culm. The specific gravityincreases with the increasing age until the bamboo matured. |
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