台湾西南部优势竹类箣竹根力之研究

箣竹为台湾西南部泥岩地区早期主要造林树种，约占该地区绿蔽率之80％，形成极优势之植物。近年来因竹材价格低落，竹林之经营管理减少，其更新造林及其对坡面之保育功能之评价渐受重视。因此本研究为针对莉竹其根力特性，特进行根系与根域范围调查、根段拉力与植株引拔试验等，推估其坡面保育功效。研究结果为箣竹之根段拉力强度（Y）与其直径（X）成指数正相关，而箣竹之引拔抗力（F）与其胸高直径（D）成指数正相关。

Study on the Root Strength of Dominant Bamboo in South-western Taiwan

Thorny bamboo was the previously most important afforestation tree in mudstone area of Taiwan. However, the bamboo forest has not remained in good condition because of the prices for bamboo material and reduced management. To improve their effectiveness of soil erosion control, the bamboo forest should be revegeted or have its vegetation structure changed. Therefore, this study investigated the root distribution, root strength, pulling resistance and certain plant physiological tests for bamboo. The results of this study were summarized as follows. Thorny bamboo root strength（Y） is exponentially proportional to the root diameter（X）. The regression equations shown below can indicate the root strengths of different root diameters. The pulling resistance（F） of individual tree species is related exponentially to their B.H.D. （D）. The equations are shown as follows.