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<p>This study aimed to evaluate whether parameters obtained by X-ray Computed Tomography (CT), differentiate cohesive from non-cohesive horizons, and establish their relationship with soil hydro-physical properties. The study was conducted on Acrisols and Lixisols from northeastern Brazil, comparing cohesive and non-cohesive horizons of each soil profile. Undisturbed samples were collected to evaluate the pore network by X-ray CT and determine saturated hydraulic conductivity (<i>K</i><sub><i>sat</i></sub>) (among these samples, 5 were collected horizontally and 5 were collected vertically), soil water retention curve, and soil aggregate stability. All cohesive horizons had higher values of micropores, ultramicropores, and cryptopores compared with non-cohesive horizons, except for the soil from Cruz das Almas (BA), which showed the opposite result. Mean weight diameter and aggregate/clod stability reveal a tendency for aggregates to be larger and more stable in cohesive horizons. The cohesive horizons of the Fortaleza (CE) and Goiana (PE) soils showed lower <i>K</i><sub><i>sat</i></sub>, greater pore tortuosity, higher Euler number (indicating lower pore system connectivity), and higher frequency of pores in the 80-1000&#xa0;µm range in relation to the non-cohesive horizons. The soil from Cruz das Almas (BA) showed no differences between the cohesive and non-cohesive horizons with regard to pore morphology evaluated by X-ray CT. Soil K<sub><i>sat</i></sub> was related negatively to almost all pore morphology parameters obtained by X-ray CT. Rendered images of the isolated pore volume revealed a striking visual difference, with cohesive horizons showing more isolated pores compared with non-cohesive horizons, except for the Cruz das Almas soil.</p>

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Quantifying Pore Network Differences Between Cohesive and Non-Cohesive Soils via X-ray CT and Hydraulic Measurements

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年7月2日

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  • Viviane Sobucki,
  • Alan Carlos Batistão,
  • Amanda Romeiro Alves,
  • Douglas Leandro Scheid,
  • Dörthe Holthusen,
  • Brivaldo Gomes de Almeida,
  • Luciano da Silva Souza,
  • Luiz Antônio Conceição de Carvalho,
  • Lisiane Sobucki,
  • José Miguel Reichert

摘要

This study aimed to evaluate whether parameters obtained by X-ray Computed Tomography (CT), differentiate cohesive from non-cohesive horizons, and establish their relationship with soil hydro-physical properties. The study was conducted on Acrisols and Lixisols from northeastern Brazil, comparing cohesive and non-cohesive horizons of each soil profile. Undisturbed samples were collected to evaluate the pore network by X-ray CT and determine saturated hydraulic conductivity (Ksat) (among these samples, 5 were collected horizontally and 5 were collected vertically), soil water retention curve, and soil aggregate stability. All cohesive horizons had higher values of micropores, ultramicropores, and cryptopores compared with non-cohesive horizons, except for the soil from Cruz das Almas (BA), which showed the opposite result. Mean weight diameter and aggregate/clod stability reveal a tendency for aggregates to be larger and more stable in cohesive horizons. The cohesive horizons of the Fortaleza (CE) and Goiana (PE) soils showed lower Ksat, greater pore tortuosity, higher Euler number (indicating lower pore system connectivity), and higher frequency of pores in the 80-1000 µm range in relation to the non-cohesive horizons. The soil from Cruz das Almas (BA) showed no differences between the cohesive and non-cohesive horizons with regard to pore morphology evaluated by X-ray CT. Soil Ksat was related negatively to almost all pore morphology parameters obtained by X-ray CT. Rendered images of the isolated pore volume revealed a striking visual difference, with cohesive horizons showing more isolated pores compared with non-cohesive horizons, except for the Cruz das Almas soil.