Study on Soil/Root System and Root Characteristics of Makino Bamboo Forest

• Main Authors: Ming-Ting Hsieh, 謝明廷
• Other Authors: Hsin-Hui Lin
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/51445996029639575227

碩士 === 國立中興大學 === 水土保持學系所 === 97 === For study the relationships between soil/root system and mechanics characteristics of the Makino Bamboo forest, the experimental site was taken in the Tao-yuan County 119 lines 8 km of Shin-men reservoir. Select 10 Makino Bamboos to observe the distribution of root system by use Profile wall methods(L 1 m × W 1 m × D 0.6 m), and used the Definiens Professional 5 software for image classification. Record hair roots and rhizomes of the destruction of load by using pull-out test of hair root test and tensile test of root segment to find the shear strength increment of soil/root system △Sr. This research result is excerpted as follows: 1. The result showed that Makino Bamboo no vertical top roots, the rhizomes distribution within 0~0.3 m soil depth. The hair roots distribution within 0~0.6 m soil depth. The results showed that Makino Bamboo have very high capacity network node soil, surface erosion resistance and water infiltration. 2. The hair roots of Makino Bamboo pull-out breakage force to become index number with its diameter just related, its calculation type is： Pp = 1210.4d2.0008 0.05×10-2 m≦d≦0.4×10-2 m Pp：pull-out breakage force (×10-3kN) d：hair roots diameter (×10-2m) 3. The tensile resistance of root segment test of rhizomes average root diameter is 0.19 m, average destruction of load is 5.44 kN and average tensile strength is 19080.2 kN/m2. 4. The shear strength increment of soil/root system △Sr is between 19.2~92.0 kN/m2, founded the shear strength increment of soil/root system with Makino Bamboo is greater than Taiwania cryptomerioides Hay and Cryptomeria japonica. The Makino Bamboo possesses an extremely complicate and random root pattern in the ground and the tightly consolidated soil/root system associated with the root reinforcement can effectively stabilize the slope in a secure situation, the hair roots can avoid direct impact of raindrops and provide surface soil anti-erosion. However, the collapse failure can be mainly resulted from the action of gigantic earthquake vibration force or the impact of road work in the slope which leads to a breakage of root system or the infiltration of rainwater into the fissure of strata which cause a decrease of shear strength of soil mass. In general, the slope with Makino’s Bamboo forest can sustain the collapse failure and soil mass.