多孔性护岸工程之植物根力研究

Study on the Root Strength of Plants for Porous Revetment Engineering

在多孔性砌石护岸中,对其植生根系发育之不同及根系力学特性之差异进行试验研究与评估,探讨其根系实质上的力学贡献与植物群落之变迁,以作为生态工程之护岸植生植物材料之选取与配置以及评估生态效益之依据。为了解及探讨其植生根力特性与机制,而对优势植物进行植株引拔抗力与其生长特性及立地环境等相关影响因子之统计回归分析,建立破坏及非破坏性根力推估模式,并期能了解植物根系特性及固土能力。因此,选取砌石护岸之整治工程中,优势木本植物水麻及山黄麻为试验植物,由植株引拔抗力等试验,进行植物引拔抗力与地际直径-基径、基径上10 cm、树高、树冠幅宽、地上部重、地下部重、地上部干重、地下部干重、土壤含水量、坡度、土壤硬度等相关影响因子之统计逐步回归(stepwise regression)分析与主要机制探讨,建立推估模式。

The root distribution type of dominant plant will be compared grows in soil and in stone revetment. The mechanical characteristics of root will be evaluated which will be an index of selecting the plant material plant on eco-technology （porous revetment）. According to the testing results,the statistical regression analysis was performed to formulate the relationships of pullout resistance of root system,the growth characteristics of plant and the field site environment and eventually to set up pullout resistance models for this particular paint. So this study selects these three plants as the root sample for pullout test and discusses its characteristics and mechanism of root strength. It is expected that the developed pullout resistance model will reflect dominant plants characteristics and soil steady of root system. This study chooses three of the most important dominant plants in in the river and small stream area of Middle-Taiwan. In order to obtain root-strength model from pulling resistance and other tests that analyze the tests＇ datum by statistical stepwise regression. The growth characteristics of dominant plants are consisted of the plant length or height,the diameter near ground,the diameter above ground 10 cm,the tree-crown width , the plant weight of upper part above ground,the plant dry weight of upper part above ground , lower part weight under ground and the dry weight. On the other hands, the field site environment refers the moisture water content of soil, gradient and hardness of soil.