摘要
为研究中亚热带常绿阔叶林中优势灌木植物根系的固土护坡力学机制,在浙江南部的山体滑坡、泥石流易发区内选择3种主要的灌木(檵木、麂角杜鹃和香港黄檀)进行野外和室内力学试验。结果表明,须根相对丰富的植物能明显提高表层土壤的抗剪强度;根系抗拉力和抗剪力均与根径呈幂函数正相关关系;檵木和麂角杜鹃根系抗拉强度与根径呈幂函数负相关关系,而香港黄檀则无明显相关性;细根比粗根更有利于土壤加固和抗剪强度的提高。
The mechanical stabilization of soil slopes by means of plant roots depends largely on the strength properties of the roots and their growth pattern within the soil.In particular area,the selection of indigenous plant species on the basis of their root properties is an essential part of biotechnical slope protection.Three plant species（Loropetalum chinense,Rhododendron latoucheae,Dalbergia millettii） were selected to determine the effects of shrub roots on slope stabilization in the geological hazards of landslide/debris flow,the mountainous area in Qinyuan County,Southern Zhejiang Province,China,which are dominant shrubs in mid-subtropical evergreen broad-leaved forest.The results showed that plant roots had positive effects on shear strength of topsoil（≤15 mm）.There was a power positive correlation between root shear resistence,root tensile force and root diameter.The root tensile strength of L.chinense and R.latoucheae had a power positive correlation with root diameter.No correlation was found within these indices in D.millettii.Fine roots were better than the coarse roots in contributing to stabilize sloping terrain and increasing the value of shear strength within topsoil.
出处
《西北林学院学报》
CSCD
北大核心
2010年第5期33-36,共4页
Journal of Northwest Forestry University
基金
浙江省林业厅一般项目(07A06)
上海市自然科学基金(08ZR1418100)
关键词
生物力学
根系
抗剪强度
抗拉强度
mechanical properties
root systems
root shear strength
root tensile strength
