A Study on Pore Structure and Erosion Resistance of Soil Column Based on CT Scanning Technology —Taking Bahiagrass Plantation as an Example

Zhang Ting; Shi Mingming; Li Xin; Wang Xinjun; Cao Longxi

doi:10.13961/j.cnki.stbctb.2023.05.018

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A Study on Pore Structure and Erosion Resistance of Soil Column Based on CT Scanning Technology —Taking Bahiagrass Plantation as an Example

- A Study on Pore Structure and Erosion Resistance of Soil Column Based on CT Scanning Technology —Taking Bahiagrass Plantation as an Example
- Bulletin of Soiland Water Conservation Vol. 43, Issue 5, Pages: 148-155(2023)
- 作者机构：
  
  1. 成都理工大学生态环境学院,四川,成都,610059
  2. 成都理工大学地球科学学院,四川,成都,610059
  3. 交通运输部科学研究院,北京,100029
- 作者简介：
- 基金信息：
- DOI：10.13961/j.cnki.stbctb.2023.05.018
  CLC： S157;S154.4
- Published：2023
- 稿件说明：
移动端阅览
Zhang Ting, Shi Mingming, Li Xin, et al. A Study on Pore Structure and Erosion Resistance of Soil Column Based on CT Scanning Technology —Taking Bahiagrass Plantation as an Example[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 148-155.
DOI：

Zhang Ting, Shi Mingming, Li Xin, et al. A Study on Pore Structure and Erosion Resistance of Soil Column Based on CT Scanning Technology —Taking Bahiagrass Plantation as an Example[J]. Bulletin of Soiland Water Conservation, 2023, 43(5): 148-155. DOI： 10.13961/j.cnki.stbctb.2023.05.018.

摘要

[目的] 分析百喜草土柱孔隙结构与土壤抗侵蚀能力之间的联系，为水土保持植物措施的优化布设以及效益评估提供科学依据。[方法] 依托植物土柱长期微区试验，通过CT扫描技术研究种植百喜草的土柱孔隙指标(孔隙长度密度、体积密度、表面积密度和孔隙数密度)，开展边坡水槽冲刷试验。设置3个坡度(10°，20°和30°)和5个流量(0.8，1.6，2.4，3.2，4.0 L/s)组合量化土壤抗侵蚀能力，分析孔隙指标与抗侵蚀能力因子之间的关系。[结果] 百喜草土柱孔隙发育程度随生长时间不断增强，而随土层深度减弱；4个孔隙结构指标在0—5 cm土层的数值远大于5—10 cm土层，且表层0—5 cm的平均土壤细沟可蚀性(0.026 s/m)和临界水流剪切力(7.0 Pa)分别是下层5—10 cm的0.33，1.54倍。[结论] 植物根系发育的孔隙指标能够表征土壤抗侵蚀能力变化，CT扫描获取的4个孔隙结构指标与细沟可蚀性等因子显著相关，其中孔隙表面积密度与土壤抗侵蚀能力指标关系最为密切。

Abstract

[Objective] The relationship between soil column pore structure and soil erosion resistance for soil columns with Bahiagrass was analyzed in order to provide a scientific basis for the optimal arrangement of plants for soil and water conservation and to assess the benefits of planting Bahiagrass. [Methods] This study was conducted using long-term experiments of Bahiagrass grown in soil columns. Four pore indicators (pore length density

bulk density

surface area density

and pore number density) of Bahiagrass soil columns were quantified by CT scanning technology. Flushing tests using a flume with variable slopes were carried out to quantify soil erosion resistance at three slopes (10°

20°

and 30°) and five runoff rates (0.8

1.6

2.4

3.2

and 4.0 L/s). The relationships between pore structure characteristics and erosion resistance factors were then determined. [Results] Bahiagrass root system development increased during the growth period

but decreased with soil depth. The values of four pore structure indicators in 0—5 cm soil layer were much higher than those in 5—10 cm soil layer

and the average soil rill erodibility (0.026 s/m) and critical shear stress (7.0 Pa) in 0—5 cm surface layer were 0.33 and 1.54 times the values of those respective parameters in 5—10 cm lower soil layer. [Conclusion] The pore characteristics of plant root development indicated soil erosion resistance. The four pore structure indicators obtained by CT scanning were significantly related to factors such as rill erodibility. The pore surface area density was most closely related to the erosion resistance factors.

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