Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration

ZHANG Lina; LI Ping; HU Xiangyang; ZHONG Jianping; YANG Kai; ZHAO Zhiyan; LI Tonglu

doi:10.13870/j.cnki.stbcxb.2024.06.018

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Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration

更新时间：2025-02-18

- Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration
- Vol. 38, Issue 6, Pages: 113-121(2024)
- 作者机构：
  
  1. 长安大学地质工程与测绘学院,西安,710054
  2. 黄土高原水循环与地质环境教育部野外科学观测研究站, 甘肃正宁,745399
  3. 中国电建集团西北勘测设计研究院有限公司,西安,710065
  4. 陕西省水土保持生态环境监测中心,西安,710199
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2024.06.018
  CLC： S157.2
- Published：2024
- 稿件说明：
移动端阅览
ZHANG Lina, LI Ping, HU Xiangyang, et al. Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration[J]. 2024, 38(6): 113-121.
DOI：

ZHANG Lina, LI Ping, HU Xiangyang, et al. Responses of Loess Ground with Different Slopes and Vegetation Covers to Rainfall Infiltration[J]. 2024, 38(6): 113-121. DOI： 10.13870/j.cnki.stbcxb.2024.06.018.

摘要

[目的] 植被类型和坡度是影响黄土斜坡土体水分对降雨响应规律的控制因素。[方法] 分别选取裸土、蒿草和刺槐覆盖的平地

裸土、蒿草、刺槐和刺槐蒿草混合覆盖的15°斜坡

以及刺槐蒿草混合覆盖的35°斜坡

共8个样地设置原位观测点

测定剖面含水率及基本物理指标

观测降雨后剖面的湿润锋深度

分析植被类型和坡度对降雨入渗的影响。在室内设置6个坡度的模型试验

研究坡度与竖直入渗深度和垂直于坡面入渗厚度的关系。[结果] 植被类型显著影响斜坡土体的湿润锋深度、含水率和饱和度

刺槐蒿草混合地的湿润锋深度最浅

湿润带饱和度可达73.0%;裸土地的湿润锋最深

湿润带的饱和度最小

最大饱和度仅为52.4%。坡度对相同植被斜坡的湿润锋深度、含水率和饱和度的影响较小

但短期内历经多次降雨后

平地湿润带含水率和饱和度略高于斜坡。通过室内模型试验发现

不同坡度黄土斜坡的竖直入渗深度不随坡度增加而变化

垂直于坡面入渗厚度随坡度增加而减小。[结论] 研究结果可为黄土斜坡浅层滑移和水土流失治理提供理论依据。

Abstract

[Objective] To investigate the soil moisture response to rainfall in loess ground with different slopes and vegetation types. [Methods] Eight in-situ observation plots were established

including flat surfaces with bare soil

Artemisia cover

and Robinia pseudoacacia cover

15° slope with bare soil

Artemisia cover

R. pseudoacacia cover

and R. pseudoacacia-Artemisia complex cover

and 35° slope with R. pseudoacacia-Artemisia complex cover. Soil moisture content and basic physical parameters of the profiles were measured. The wetting front depth after rainfall was observed and the impact of vegetation type and slope gradient on rainfall infiltration was analyzed. Additionally

laboratory model tests with six different slope gradients were conducted to study the relationships between slope gradient

as well as vertical infiltration depth

and infiltration thickness normal to the slope surface. [Results] The results suggest that vegetation types significantly affected the depth of the wetting front

soil moisture content

and saturation of slope soils. The R. pseudoacacia-Artemisia complex cover had the shallowest wetting front depth with a saturation of 73.0%. The bare soil exhibited the deepest wetting front and the lowest saturation

which was only 52.4%. The slope gradient had a minimal impact on the wetting front depth

soil moisture content and saturation for slopes with identical vegetation. However

after a number of short-term rainfall events

the moisture content and saturation in the wetting zone were slightly higher in flat ground than those in slopes. Laboratory model tests revealed that the vertical infiltration depth in slope was independent of slope gradient. In contrast

the infiltration thickness normal to the slope surface decreased with increasing slope gradient. [Conclusion] The study can provide a theoretical support for shallow landslide mitigation and soil erosion control for loess slopes.

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Keywords

references

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