Can The Pore Scale Geometry Explain Soil Sample Scale Hydrodynamic Properties?

Smet, Sarah De; Beckers, Éléonore; Plougonven, Erwan; Léonard, Angélique; Degré, A.

doi:10.3389/fenvs.2018.00020

Cited by 18 publications

(10 citation statements)

References 84 publications

(135 reference statements)

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“…Our results showed that air permeability was significantly correlated with global connectivity and local connectivity (Table 3). Similarly, Zhang et al (2019) also demonstrated that macropore connectivity is closely related to air permeability, and it is generally considered that the degree of pore connectivity can be used to predict air permeability to a significant extent (Smet et al, 2018).…”

Section: Discussionmentioning

confidence: 98%

“…The local macropore connectivity is commonly expressed by the function of the number of isolated pores (N), the genus (C), the number of completely enclosed cavities (H), and the Euler number (N-C+H) (Smet et al, 2018). The Euler number may be determined by using an algorithm calculating voxel neighbourhoods in the "BoneJ connectivity" plugin of ImageJ, then the specific Euler number (Χν) may be calculated as follows:…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Variable responses of soil pore structure to organic and inorganic fertilization in a Vertisol

Ruan¹,

Zhang²,

Tu³

et al. 2021

Int. Agrophys.

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Section: Discussionmentioning

confidence: 98%

Section: Methodsmentioning

confidence: 99%

Variable responses of soil pore structure to organic and inorganic fertilization in a Vertisol

Ruan¹,

Zhang²,

Tu³

et al. 2021

Int. Agrophys.

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“…The tomographic acquisition was then performed on a high‐resolution desktop micro‐computed tomography (Skyscan‐1172; Skyscan, Kontich, Belgium) at the Chemistry Engineering Laboratory of the University of Liege. The X‐ray source was set at 100 kV and 100 μA, and an aluminum‐copper filter was used to reduce beam hardening (Beckers et al, 2014; Smet, Beckers, Plougonven, Léonard, & Jarvis, 2018). The rotation step for each soil sample was 0.3° over 180°.…”

Section: Methodsmentioning

confidence: 99%

“…The tomographic acquisition was then performed on a high-resolution desktop micro-computed tomography (Skyscan-1172; Skyscan, Kontich, Belgium) at the Chemistry Engineering Laboratory of the University of Liege. The X-ray source was set at 100 kV and 100 μA, and an aluminum-copper filter was used to reduce beam hardening (Beckers et al, 2014;Smet, Beckers, Plougonven, Léonard, & Jarvis, 2018 Image preprocessing, segmentation, and quantification were undertaken using the FIJI software and a 3D Gaussian filter with a radius of two pixels was used to reduce noise. An unsharp mask with a standard deviation of one voxel (weight of 0.6) was then applied to emphasize edges (Jarvis et al, 2017).…”

Section: Computerized Tomography Scanning Image Processing and Morphological Analysesmentioning

confidence: 99%

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Liang

et al. 2020

Land Degrad Dev

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Soil water repellency (SWR) has significant effects on soil degradation by changing some soil processes (e.g., carbon sequestration and soil erosion). Understanding the influence factors of SWR under conservation agriculture are playing a vital role in the sustainable development for improving soil quality. However, how soil pore structure influence on SWR remains unclear. We aim to assess the impact of hydrophobic substances and pore structure on SWR. Here we conducted two long‐term experimental fields with three treatments: conventional tillage (CT), reduced tillage (RT), and no‐tillage (NT). X‐ray tomography and the sorptivity method were used to measure soil pore structure and SWR, respectively. We found that soil organic carbon (SOC) and microbial biomass carbon (MBC) were higher in RT and NT treatments than in CT. MBC had significant influences on soil water sorptivity (Sw) and water repellency index (RI; p < 0.001), whereas SOC had no influence on Sw (p > 0.05). MBC also showed a closer relationship with SWR than SOC in redundancy analysis. The RT and NT increased the porosity of 55–165 μm that had a positive relationship with ethanol sorptivity and RI (p < 0.05). Ethanol sorptivity increased with an increase in soil pore porosity and connectivity under RT and NT treatments. However, increasing the pore surface area could decrease Sw due to enhance contact area between hydrophobic substances and soil water. Overall, the RT and NT treatments increased the water repellency index, which was a result of the interactions between pore structure and hydrophobic substances.

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Section: Computerized Tomography Scanning Image Processing and Morpho...mentioning

confidence: 99%

Factors governing soil water repellency under tillage management: the role of pore structure and hydrophobic substances

Li¹,

Lu²,

Degré³

2020

Preprint

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<p>Soil water repellency (SWR) has significant consequences for crop yield, carbon sequestration, aggregate stability, soil erosion, and water movement. It is known to be linked to hydrophobic substances and pore structure. Conservation agriculture could affect SWR through both aspects. However, most of the studies have only focused on hydrophobic substances due to the complexity of soil pore structure measurement and quantification. In this study, X-ray computed tomography at a resolution of 27.27 &#956;m was used to calculate the shape, porosity, and connectivity of the pore network and reveal the impact of hydrophobic substances and pore structure on SWR. All samples were collected from two long-term experimental fields. The treatments were conventional tillage with residue removal (CT), reduced tillage with residue incorporated (RT), and no-tillage with residue mulch (NT) in both of the fields. The water repellency index was determined using the intrinsic sorptivity method by measuring the water and ethanol sorptivity. The results showed that RT and NT treatment increased the porosity of pores of 55-165 &#956;m in diameter that had a positive relationship with ethanol sorptivity and water repellency index, respectively. However, the total porosity and the porosity of >165 &#956;m in diameter had no significant link with SWR properties. RT and NT treatments could enhance ethanol sorptivity by increasing pore connectivity. However, pore connectivity had no effect on water sorptivity because of the hydrophobic substances. NT treatment also reduced water sorptivity by increasing pore surface area and hydrophobic substances. Soil organic carbon and microbial biomass carbon, both of them as hydrophobic substances, were higher under RT and NT treatment than CT. Microbial biomass carbon was more positively correlated to SWR than soil organic carbon, which indicates that microbial biomass carbon is a better indicator explaining tillage effects on SWR. Overall, RT and NT treatment could increase the water repellency index, which was a&#160;result&#160;of&#160;the&#160;interactions&#160;between pore structure and hydrophobic substances. In order to unravel the mechanisms underlying conservation tillage impacts on SWR more accurately, it is essential to determine both pore structure and hydrophobic substances at the same time.</p>

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Can The Pore Scale Geometry Explain Soil Sample Scale Hydrodynamic Properties?

Cited by 18 publications

References 84 publications

Variable responses of soil pore structure to organic and inorganic fertilization in a Vertisol

Variable responses of soil pore structure to organic and inorganic fertilization in a Vertisol

Factors governing soil water repellency under tillage management: The role of pore structure and hydrophobic substances

Factors governing soil water repellency under tillage management: the role of pore structure and hydrophobic substances

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