水土保持通报2011，Vol.31Issue(5)：85-89,214,6.
蒋家沟泥石流区新银合欢细根固土效应
Effect of Leucaena Leucocephala Fine Root on Soil Fixation in Debris Flow Area of Jiangjia Gully
摘要
Abstract
Variously aged Leucaena leucocephala in debris flow area of Jiangjia gully were chosen and the fine root systems were dug out from the surface to the bottom layers at different distances from the stem in three directions.Basing on the analysis of fine root vertical distributions and composition,the effect of fine roots on the soil shear strength were estimated according to reinforcement theory.The result show that fine roots exhibited an obvious accumulation trait in the topsoil layer,which reduced with depth.Approximately 80% of the fine root materials were found in the layer between 0—120 cm depths.Fine roots were mainly composed of smaller ones（D≤1 mm）and determined the development of root distribution.The 10-year stands had more fine roots（D≤1 mm） than 5-year ones,and the 15-year stands had obviously more intermediate roots（1 mm≤D≤2 mm） comparing to the 10-year stands.Root tensile strength decreased significantly with increasing diameter,following a power law function.The soil shear strength enhanced by fine roots was highly variable among depths and ages,largely depended on the smaller roots（D≤1 mm）.关键词
蒋家沟/新银合欢/细根分布/固土效应Key words
Jiangjia gully/Leucaena leucocephala/fine root distribution/soil reinforcement effect分类
资源环境引用本文复制引用
郭灵辉,王道杰,陈东,陈晓艳..蒋家沟泥石流区新银合欢细根固土效应[J].水土保持通报,2011,31(5):85-89,214,6.基金项目
国家自然科学基金项目“固氮植物防治泥石流的抑灾作用机制研究” （）
中国科学院知识工程重要方向课题“震裂坡地暴雨型泥石流滑坡区生态恢复理论与技术” （）
