芒萁根系对崩岗红土层土壤抗剪强度的影响

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

doi:10.13870/j.cnki.stbcxb.2020.06.023

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芒萁根系对崩岗红土层土壤抗剪强度的影响

更新时间：2025-03-12

- 芒萁根系对崩岗红土层土壤抗剪强度的影响
- Effects of
- 水土保持学报 2020年34卷第6期页码：159-165
- 作者机构：
  
  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
- 作者简介：
  
  [ "林嘉辉(1995-),男,福建福州人,硕士研究生,主要从事土壤侵蚀与治理研究。E-mail:linjh9502@163.com" ]
- 基金信息：
  
  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）
- DOI：10.13870/j.cnki.stbcxb.2020.06.023
  中图分类号： S157
- 纸质出版：2020
- 稿件说明：
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林嘉辉, 黄梦元, 张莉婷, 等. 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.

LIN Jiahui, HUANG Mengyuan, ZHANG Liting, et al. Effects of[J]. 2020, 34(6): 159-165.
林嘉辉, 黄梦元, 张莉婷, 等. 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. DOI： 10.13870/j.cnki.stbcxb.2020.06.023.

LIN Jiahui, HUANG Mengyuan, ZHANG Liting, et al. Effects of[J]. 2020, 34(6): 159-165. DOI： 10.13870/j.cnki.stbcxb.2020.06.023.

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。

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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