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題 名 | 溪頭銀杏林健康檢測及基本性質之研究=The Study on the Health Examination and Wood Properties of Ginkgo |
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作 者 | 陳勁豪; 李柏崇; 楊德新; 李佳如; 徐光平; 陳和田; 王亞男; 蔡明哲; | 書刊名 | 國立臺灣大學生物資源暨農學院實驗林研究報告 |
卷 期 | 24:4=270 2010.12[民99.12] |
頁 次 | 頁271-284 |
分類號 | 436.18 |
關鍵詞 | 銀杏; 超音波; 應力波; 木材性質; VTA; Ginkgo biloba; Ultrasonic; Stress wave; Visual tree assessment; Wood property; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究因溪頭森林遊樂區中的銀杏林,受到病害等影響產生樹勢衰弱,故進一步利用目視樹木評估法(Visual tree assessment, VTA)來加以評估銀杏受病害的損害情形,而經檢測得知銀杏危險程度高者(外觀評估>12分)佔銀杏林中的12%,而樹勢稍為衰減者(6<外觀評估<12分)佔56%,比較健康的銀杏(外觀評估<6分)佔32%,健康的林木橫向超音波波速為1593m/s,健康度稍減的橫向超音波波速為1569m/s,危險度高的林木,其橫向超音波波速為1112m/s;危險度高的林木比健康的林木超音波波速降低30%,超音波波速越高,相對的空洞率也比較低,而危險度高之銀杏,橫向超音波波速降低,空洞率與超音波波速呈負相關。而空洞率=-0.0001x超音波波速+0.3536。同時由外觀檢測所得結果與應力波影像斷面圖相符合。健康銀杏的氣乾比重為0.45,銀杏的抗壓強度為335.9kgf/cm^2,而其破壞型態皆為壓碎式破壞,在管胞長方面,管胞長度為3.74mm,管胞長的橫向變化為由髓心向樹皮側呈W型的變化,且早材管胞壁孔為重緣壁孔呈2列或4列。 |
英文摘要 | Since the Ginkgo (Ginkgo biloba) grove in the Xitou recreational area is weakening in growth caused by infected disease, this research used visual tree assessment to evaluate Ginkgo damages cause by the disease. After the assessment, the Ginkgo trees rated at high risk were 12% of the Ginkgo grove (VTA >12 points). The Ginkgo trees that are slightly weakening, 6 < VTA < 12 points, were 56%. The healthier Ginkgo trees, VTA < 6 points, are about 32% of the entire Ginkgo grove. The transversal ultrasonic velocity of the healthy Ginkgo tree is 1593 m/s. The less healthy Ginkgo tree's transversal ultrasonic velocity is 1569 m/s. The high risk tree group has transversal ultrasonic velocity to be 1112 m/s. In addition, ultrasonic velocity of high risk tree group is reduced by 30% in comparison to that of the healthy tree group. The higher the ultrasonic velocity represents the lesser presence of cavity. Therefore, trees with low ultrasonic velocity not only have greater standard deviation, but also have greater cavity rate. Cavity rate = -0.0001 ultrasonic velocity +0.3536. Simultaneously, the results of visual inspection coincide with the ultrasonic profile diagrams. Air-dry specific gravity of Ginkgo is 0.45, and its compressive strength is 335.9 kgf/cm^2. Its damage condition is of crash compressive damage type. As for the tracheid, its length is 3.74mm. Tracheid's transveral alteration is deviating in W formation from the pitch to the bark. In addition, earlywood tracheids are of bordered pit appearing in rows of 2 and 4. |
本系統中英文摘要資訊取自各篇刊載內容。