植物根系的固土效应是目前水土保持领域研究的热点问题.通过种植狗牙根和紫花苜蓿2种草本植物,现场取根样分析了根系的分形特征,并进行了直剪试验.试验结果表明:根系对植被混凝土抗剪强度有增强作用,并且根-土复合体抗剪强度的增幅与根系分形特征存在显著的关系,即根-土复合体抗剪强度增幅随根系分形维数增加呈现出先增加后减少的趋势.%Reinforcing effect of root-soil composite system is the hot issues in the areas of water and soil conservation. Two herb plants Alfalfa and Cynodon Dactylon were planted in vegetation-growing concrete matrix, and roots fractal feature and shear strength were analysed. It is indicated that the plant roots could improve soil shear strength significantly; and the soil shear strength amplification increases with increase of root fractal dimension first and then decraeses.
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