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| 題 名 | 坡度對九芎實生苗根系型態與生物力學性質之效應=Effects of Slopes on Root System Morphology and Biomechanical Properties of Lagerstroemia Subcostata Seedlings |
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| 作 者 | 李嶸泰; 李江山; 蔡順明; 林中鴻; | 書刊名 | 中華林學季刊 |
| 卷 期 | 49:4 2016.12[民105.12] |
| 頁 次 | 頁319-336 |
| 分類號 | 436.2 |
| 關鍵詞 | 九芎; 拉拔抗力; 根系型態; 抗剪強度; 坡度; 抗拉強度; Lagerstroemia subcostata; Pullout resistance; Root system morphology; Shear strength; Slope; Tensile strength; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 九芎(Lagerstroemia subcostata Koehne)具根系強健、耐旱及耐貧瘠之特性,為臺灣原生先驅之崩塌地復舊造林樹種。本研究旨在以全根挖掘法及力學試驗法,調查及測定栽植於不同坡度(0°、30°、45°)植物栽培箱之九芎八個月生實生苗之根系型態及生物力學性質,以提供崩塌地復舊造林之技術資料。研究結果顯示,九芎實生苗之根系型態屬於平行與水平型(PH-type)。坡度0°苗木之二次側根數及長度均顯著大於30°與45°者。WinRHIZO分析結果顯示,坡度0°者之總根長、總根表面積及根毛數均顯著大於45°者。坡度0°苗木之高生長、地際直徑及總生物量均顯著大於30 與45°者。坡度0°九芎之最大拉拔抗力顯著高於30°與45°者。根系之最大拉拔抗力與地際直徑、主根直徑、地上部生物量及根部生物量均呈線性正相關。九芎苗單根之最大抗剪力隨單根直徑之增加而增加,且呈顯著正冪函數相關,然而其單根抗剪強度則隨單根直徑之增加而降低,呈對數函數相關。九芎單根之抗拉力隨單根直徑之增加而增加,且呈正冪函數相關。九芎苗單根之抗拉強度隨單根直徑之增加而降低,且呈對數函數相關。本研究證實,坡度對九芎實生苗之根系型態及生物力學性質有顯著之影響,建議崩塌地復舊造林可採用等高線橫坡步道整地技術或利用平台階段方式,以利九芎根系之生長。 |
| 英文摘要 | Lagerstroemia subcostata Koehne (crape myrtle), with characteristics of strong root system and tolerance to drought and low soil fertility, is a good native pioneer species for landslide reforestation in Taiwan. The study aimed to investigate the root system morphology and determine the biomechanical properties of 8-month-old crape myrtle seedlings planted in plant cultivation boxes at different slopes (0°, 30° and 45° slopes, respectively) by excavation method and mechanical tests, to provide technical information for landslide reforestation. The results showed that root system morphology of crape myrtle belonged to the PH-type. The number and length of second-order lateral roots of seedlings on the 0° slope were significantly higher than those on 30° and 45° slopes. WinRHIZO analysis revealed the total root length, root surface area, and seedling root hair number on 0° slope were significantly higher than those on the 45° slopes. Meanwhile, the height, root collar diameter and biomass of the seedlings on the 0° slope were significantly higher than those on the 30° and 45° slopes. The maximum pullout resistance of the seedlings on the 0° slopes was significantly higher than those on the 30° and 45° slopes. Regression analysis showed linear positive correlations between the maximum pullout resistance and the root collar diameter, tap root diameter, above-ground biomass and root biomass. The maximum root shear force increased with increasing root diameter and showing a positive power function correlation. However, root shear strength decreased with increasing root diameter and showing a logarithmic function correlation. The maximum root shear force and root shear strength of the seedlings on the 0° slopes were significantly higher than those on the 45° slopes. There was a significantly positive power function correlation between the maximum root tensile resistance and root diameter. Conversely, the root tensile strength decreased with increasing root diameter and showing a logarithmic function correlation. This study demonstrated that slope significantly affected the root system morphology and biomechanical properties of crape myrtle seedlings. In order to ensure good growth of root system of crape myrtle, it is suggested that contour line cross slope trail soil preparation technique or bench terraces method should be used in landslide reforestation practices. |
本系統中英文摘要資訊取自各篇刊載內容。