HUANG Xiao-le,XU Wen-nian,XIA Zhen-yao.Direct Shear Test of Root-Soil Composite System by Two Representative Herb Plants in Vegetation-Growing Concrete Base Material[J].Research of Soil and Water Conservation,2010,17(04):158-161,165.
植被混凝土基材2种草本植物根-土复合体直剪试验研究
- Title:
- Direct Shear Test of Root-Soil Composite System by Two Representative Herb Plants in Vegetation-Growing Concrete Base Material
- 分类号:
- X171.4;S157
- 摘要:
- 通过在植被混凝土基材上对狗牙根和紫花苜蓿2种有代表性的草本植物进行样地种植和室内直剪试验，分析植被混凝土基材上不同深度根-土复合体抗剪强度的分布规律，对比基材空白样地相应深度的抗剪强度，证实和量化了草本植物根系增强土壤抗剪切强度的作用。试验表明：根-土复合体在0-10cm土层内摩擦角变化不明显，粘聚力随深度先增大后减小；与基材空白样样地相比，根-土复合体内摩擦角变化不大，粘聚力变化显著，狗牙根粘聚力最大增幅为129.4%，紫花苜蓿粘聚力最大增幅为77%；狗牙根根-土复合体抗剪强度比同期生长的紫花苜蓿根-土复合体的抗剪强度高。
- Abstract:
- Two representative herb plants Bermuda grass and Medicago sati are planted in the vegetation-growing concrete base material in the testing areas,then direct shear tests on the unplanted soil and root-soil composite system are conducted.The distribution pattern of the anti-shearing strength of root-soil composite system with increasing depth in different soil layers is studied.By comparing the shear strength indexes of the soil without roots and two kinds of soils with roots,the mechanical effects of the root-soil composite system of two herb plants with six-month growth period can be verified and quantified.The results showed that the variation trend of the cohesion in different soil layers of the root-soil composite systems increased in 2-4cm soil layer and then it decreased,and there were no apparent changes in the internal friction angle with the depth increase of the soil.Compared with the cohesion of soil without roots,the maximum increasing amplitudes of the cohesion of Bermuda grass and Medicago sati were 129.4% and 77.0%,respectively.The anti-shearing strength of root-soil composite system of Bermuda grass was better than that of Medicago sati after six-months growth period.
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备注/Memo
收稿日期:2010-1-29;
基金项目:国家自然科学基金项目（50879043）;国家科技支撑计划项目（2006BAC10B04）
作者简介:黄晓乐（1984- ），女，湖北浠水县人，硕士研究生，从事生态恢复技术研究。E-mail：xiaole1012@163.com