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題名 | Stress Wave Tomogram and Wood Density Profile in a Royal Palm Tree: A Case Study=大王椰子的應力波斷層影像及木材密度圖譜檢測之案例報告 |
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作者 | 黃裕星; 鍾智昕; 吳孟玲; 林振榮; Huang, Yue-hsing; Chung, Chih-hsin; Wu, Meng-ling; Lin, Cheng-jung; |
期刊 | 臺灣林業科學 |
出版日期 | 20130900 |
卷期 | 28:3 2013.09[民102.09] |
頁次 | 頁129-144 |
分類號 | 436.18 |
語文 | eng |
關鍵詞 | 危險樹木評估; 斷層影像; 應力波; 樹木風險評估; 木材密度圖譜; Evaluation of hazardous trees; Tomogram; Stress wave; Tree risk assessment; Wood density profile; |
中文摘要 | 本研究檢測大王椰子樹在不同高度的樹幹應力波斷層影像及木材密度(D)圖譜,並調查水分在脫濕過程中不同含水率(MC = 60~270%)對橫向應力波速度(V)的影響。結果發現樹幹橫斷面中,最高V及 D是位於外圍周邊區域(外殼厚度)及樹高2公尺位置,最低V及D是位於中央區域及樹高5~6公尺位置。未損壞樹幹橫斷面從外殼區域到中央區域的相對應橫向V圖譜,在橫斷面上形成一個對稱的層狀結構圖。目視檢查發現樹木基部之樹幹橫斷面有較大的外殼厚度及比例。D(MC約12%)與V(生材狀況)之間的關係可用一元二次複迴歸表達(決定係數,R2 = 0.82, p < 0.01)。實際檢測樹幹橫斷面時,MC愈高時 V愈高,MC顯著的影響V值(R2 = 0.61, p < 0.01)。因此,當在現場檢測大王椰子立木時,可以依據不同的MC來調整獲得更精確的橫向V值。 |
英文摘要 | This study examined transverse stress wave tomographies and wood density (D) profiles of a royal palm (Roystonea regis) tree trunk at different heights. Moreover, effects of different moisture contents (MCs of 60~270%) on the transverse stress wave velocity (V) during desorption were investigated. Results showed that the highest V and D values on the tree trunk were both located in the peripheral region at 2 m above the ground, while the lowest V and D values on the tree trunk were found in the inner region at 5~6 m above the ground. Corresponding radial V values of the undamaged disc cross-section from the peripheral region to the inner region showed a symmetrical layered structure. Visual inspection of disc cross-section revealed a larger thickness and ratio of the peripheral region in the tree trunk at the tree base. The relationship between the D (at about 12% MC) and V (green) can be expressed by a second-order polynomial regression (R^2=0.82, p<0.01). The V was significantly (R^2=0.61, p<0.01) affected by the MC and tended to increase with an increasing MC. When making an acoustic inspection, it is necessary to adjust the V of standing trees with different MCs for comparison purposes and to achieve higher accuracy, which would in turn yield more-accurate tree inspection assessments. |
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