Research of Soil Erosion Thresholds on the Lower Slopes of Different Vegetation Cover in Typical Areas of Loess Plateau

ZHANG Longqi; JIA Guodong; Lü Xiangrong; LEI Ziran; LIU Rui; ZHANG Xiao

doi:10.13870/j.cnki.stbcxb.2023.02.022

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Research of Soil Erosion Thresholds on the Lower Slopes of Different Vegetation Cover in Typical Areas of Loess Plateau

更新时间：2025-03-12

- Research of Soil Erosion Thresholds on the Lower Slopes of Different Vegetation Cover in Typical Areas of Loess Plateau
- Vol. 37, Issue 2, Pages: 187-198(2023)
- 作者机构：
  
  1. 北京林业大学国家林业和草原局水土保持重点实验室,北京,100083
  2. 北京林业大学水土保持学院, 首都圈森林生态系统国家定位观测研究站,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.13870/j.cnki.stbcxb.2023.02.022
  CLC： S157.1
- Published：2023
- 稿件说明：
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ZHANG Longqi, JIA Guodong, Lü Xiangrong, et al. Research of Soil Erosion Thresholds on the Lower Slopes of Different Vegetation Cover in Typical Areas of Loess Plateau[J]. 2023, 37(2): 187-198.
DOI：

ZHANG Longqi, JIA Guodong, Lü Xiangrong, et al. Research of Soil Erosion Thresholds on the Lower Slopes of Different Vegetation Cover in Typical Areas of Loess Plateau[J]. 2023, 37(2): 187-198. DOI： 10.13870/j.cnki.stbcxb.2023.02.022.

摘要

为了分析植被覆盖对黄土高原坡面水土流失的影响

量化土壤侵蚀的植被覆盖阈值

基于模拟降雨数据分析了植被覆盖对土壤侵蚀的作用机制

利用绥德、西峰、天水等黄土高原高原典型地区的野外径流小区定位观测资料

探讨了不同覆被类型下植被覆盖控制径流和土壤侵蚀的有效性

确定了不同覆被类型下植被覆盖调控径流和防治土壤侵蚀的植被覆盖下限阈值和上限阈值。结果表明:(1)植被覆盖度的提高增加了土壤入渗、减少了径流量、延缓了径流流速、增加了土壤抵抗侵蚀的能力。(2)坡面径流量随植被覆盖度呈幂函数或指数函数下降

土壤侵蚀量随植被覆盖度呈指数函数、幂函数或者对数函数下降。(3)总体而言

不同地区植被控制土壤侵蚀的下限阈值在20%~30%

上限阈值在50%~70%。(4)土壤质地、植被类型、甚至植被的根系特征对植被控制径流和土壤侵蚀的效益有重要影响。研究结果为黄土高原水土保持工作提供研究依据。

Abstract

In order to analyze the influence of vegetation cover on soil and water loss on the Loess Plateau slope and quantify the threshold of vegetation cover of soil erosion

the mechanism of vegetation cover on soil erosion was analyzed based on simulated rainfall data

and the observation data of field runoff plots in typical areas of the Loess Plateau such as Suide

Xifeng and Tianshui were used.The effectiveness of vegetation cover in controlling runoff and soil erosion under different cover types was discussed

and the lower threshold and upper threshold of vegetation cover in regulating runoff and preventing soil erosion under different cover types were determined.The results showed that:(1) The increases of vegetation coverage increased soil infiltration

reduced runoff

delayed runoff velocity

and increased soil resistance to erosion.(2) Slope runoff decreased with vegetation coverage as a power function or exponential function

and soil erosion decreased with vegetation coverage as an exponential function

power function or a logarithmic function.(3) In general

the lower threshold and upper threshold of soil erosion control by vegetation in different regions were 20%~30% and 50%~70% respectively.(4) Soil texture

vegetation type and even root characteristics of vegetation had important effects on the benefits of vegetation in controlling runoff and soil erosion.The results provide a research basis for soil and water conservation on the Loess Plateau.

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