Effects of Vegetation Pattern on Spatial Distribution of Soil Particles Due to Water Erosion on an Pisha Sandstone Slope

Zhang Shangxuan; Li Long; Zhu Zhizhuo; Zhang Peng; Guo Yangyang; Yao Liqiang

doi:10.13961/j.cnki.stbctb.2023.04.011

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Effects of Vegetation Pattern on Spatial Distribution of Soil Particles Due to Water Erosion on an Pisha Sandstone Slope

- Effects of Vegetation Pattern on Spatial Distribution of Soil Particles Due to Water Erosion on an Pisha Sandstone Slope
- Bulletin of Soiland Water Conservation Vol. 43, Issue 4, Pages: 83-94(2023)
- 作者机构：
  
  1. 内蒙古农业大学沙漠治理学院,内蒙古,呼和浩特,010018
  2. 国家林业与草原局荒漠生态系统保护与修复重点实验室,内蒙古,呼和浩特,010000
  3. 克什克腾旗水利局,内蒙古,赤峰,025350
  4. 内蒙古自治区水利事业发展中心,内蒙古,呼和浩特,010020
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.04.011
  CLC： S152
- Published：2023
- 稿件说明：
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Zhang Shangxuan, Li Long, Zhu Zhizhuo, et al. Effects of Vegetation Pattern on Spatial Distribution of Soil Particles Due to Water Erosion on an Pisha Sandstone Slope[J]. Bulletin of Soiland Water Conservation, 2023, 43(4): 83-94.
DOI：

Zhang Shangxuan, Li Long, Zhu Zhizhuo, et al. Effects of Vegetation Pattern on Spatial Distribution of Soil Particles Due to Water Erosion on an Pisha Sandstone Slope[J]. Bulletin of Soiland Water Conservation, 2023, 43(4): 83-94. DOI： 10.13961/j.cnki.stbctb.2023.04.011.

摘要

[目的] 研究内蒙古鄂尔多斯市典型砒砂岩地区不同植被格局下表层土壤颗粒组成空间分布特征，探明水力侵蚀下土壤颗粒分选搬运机制，为该区域生态环境恢复提供理论基础。[方法] 基于野外径流小区的原位监测试验，采用三维激光扫描与地统计学相结合的方法分析自然降雨条件下，砒砂岩坡面不同植被格局对表层土壤颗粒空间分布的影响。[结果] ①均匀分布的植被格局可有效抑制坡面的产流产沙。与裸露坡面相比其侵蚀区面积、平均径流量、平均泥沙量分别降低了5.35%，63.16%，76.47%。②均匀分布的植被格局下土壤黏粒、粉粒的含量分别较雨前增加了1.3%，2.2%，砂粒含量减少了3.2%；随机分布、聚集分布的植被格局下砂粒的含量分别增加了5.8%，15.3%，使土壤质地粗化。③不同的植被格局是引起土壤颗粒空间变异的主要因素。与降雨前相比，均匀分布、随机分布的植被格局使粉粒、砂粒的块金系数变高，空间自相关性降低；聚集分布的植被格局使黏粒、粉粒的块金系数由95.06%，83.89%降为0.07%，0.06%，表现出强烈的空间自相关性。[结论] 均匀分布的植被格局对砒砂岩坡面有着良好的水土保持作用，可显著减少坡面产流产沙过程并抑制土壤粗化。

Abstract

[Objective] The spatial distribution characteristics of surface soil particles under different vegetation patterns at Pisha sandstone area in tipical area in Ordos City

Inner Mongolia Autonoous Region

and the sorting and transportation mechanisms of water erosion for soil particles were studied in order to provide a theoretical basis for the restoration of the ecological environment in this area. [Methods] The study was conducted with in-situ monitoring of field runoff plots. The effects of different vegetation patterns on the spatial distribution of surface soil particles on Pisha sandstone slopes under natural rainfall conditions were determined by combining three-dimensional laser scanning and geostatistics. [Results] ① The uniformly distributed vegetation pattern effectively inhibited runoff and sediment production on the slope. The erosion area

average runoff

and average sediment volume were 5.35%

63.16%

and 76.47%

respectively

lower than observed for the bare slope. ② Under the uniformly distributed vegetation pattern

the contents of soil clay and silt particles were 1.3% and 2.2%

respectively

greater after rain than before rain

and sand content was 3.2% lower. The content of sand particles increased after rain by 5.8% and 15.3% in the randomly distributed and aggregated vegetation patterns respectively

resulting in a coarsening of soil texture. ③ Different vegetation patterns were the main factors causing the spatial variation of soil particles. The uniformly distributed and randomly distributed vegetation patterns increased the nugget coefficients of silt and sand particles after rainfall

and decreased the spatial autocorrelation. The aggregated vegetation pattern decreased the nugget coefficients of clay and silt particles from 95.06% and 83.89% to 0.07% and 0.06%

showing a strong spatial autocorrelation. [Conclusion] A uniformly distributed vegetation pattern produced suitable soil and water conservation benefits on an arsenic sandstone slope

significantly reducing runoff and sediment production and inhibiting soil coarsening.

关键词

Keywords

references

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