| 芒萁根系对崩岗红土层土壤抗剪强度的影响 |
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| 引用本文： | 林嘉辉,黄梦元,张莉婷,陈艳,施悦忠,许永明,林金石,黄炎和,蒋芳市.芒萁根系对崩岗红土层土壤抗剪强度的影响[J].水土保持学报,2020,34(6):159-165. |
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| 作者姓名： | 林嘉辉 黄梦元 张莉婷 陈艳 施悦忠 许永明 林金石 黄炎和 蒋芳市 |
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| 作者单位： | 1. 福建农林大学资源与环境学院, 福州 350002;2. 安溪县水土保持委员会办公室, 福建 安溪 362000 |
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| 基金项目： | 海峡两岸红壤区水土保持协同创新中心项目（K80ND800303）；国家自然科学基金项目（41571272） |
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| 摘 要： | 为探究植物根系对崩岗红土层土壤抗剪强度的作用机制，采取室内直剪试验，研究不同含水率条件下芒萁（Dicranopteris dichotoma）根系对红土层抗剪强度的影响。结果表明：（1）不同根重密度土体的抗剪强度总体随含水率增加而下降，含根土体的抗剪强度大于素土。（2）黏聚力随着含水率的增加均呈先增大后减小的趋势，而随根重密度的增加呈增大的趋势，且增量逐渐减小。（3）内摩擦角与土壤含水率之间呈线性负相关，但与根重密度之间无明显关系。（4）含水率对抗剪强度的影响大于根重密度，可用含水率和根重密度模拟根土复合体的抗剪强度（NSE=0.84）。综上，根系的作用可增加崩壁红土层土壤的抗剪强度，但高含水率条件下根系的增强效应降低，可通过减少水分注入以增加崩壁根土复合体的稳定性。
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| 关 键 词： | 崩岗 红土层 根土复合体 抗剪强度 芒萁 根重密度 |
| 收稿时间： | 2020/5/19 0:00:00 |
Effects of Dicranopteris dichotoma Roots on Soil Shear Strength of Red Soil Layer in Benggang |
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| LIN Jiahui,HUANG Mengyuan,ZHANG Liting,CHEN Yan,SHI Yuezhong,XU Yongming,LIN Jinshi,HUANG Yanhe,JIANG Fangshi.Effects of Dicranopteris dichotoma Roots on Soil Shear Strength of Red Soil Layer in Benggang[J].Journal of Soil and Water Conservation,2020,34(6):159-165. |
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| Authors: | LIN Jiahui HUANG Mengyuan ZHANG Liting CHEN Yan SHI Yuezhong XU Yongming LIN Jinshi HUANG Yanhe JIANG Fangshi |
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| Institution: | 1. College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002;2. Office of Anxi County Water and Soil Conservation Committee, Anxi, Fujian 362000 |
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| Abstract: | In order to explore the mechanism of plant roots on the soil shear strength of red soil layer in Benggang, an indoor direct-shear-test was taken to study the effect of Dicranopteris dichotoma roots on the shear strength of red soil layer under different water contents. The results showed that: (1) The shear strength of soil samples with different root weights generally decreased with the increasing water contents, and the shear strength of soil samples with roots was greater than that without roots. (2) Cohesion tended to increase first and then decrease with the increase of water contents, and increased with the increase of root weight density, but the increment gradually decreased. (3) There was a linear negative correlation between the internal friction angle and soil water content, but the internal friction angle had no obvious relationship with root weight density. (4) The influence of water content on shear strength was greater than that of root weight density. Water content and root weight density could be used to simulate the shear strength of the root-soil composite (NSE=0.84). In summary, plant roots could increase the soil shear strength of red soil layer on collapsing wall, but the strengthen effect of roots was reduced under high water content, and the stability of root-soil composite on collapsing wall could be increased by reducing the water injection. |
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| Keywords: | Benggang red soil layer root-soil composite shear strength Dicranopteris dichotoma root weight density |
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