Revealing soil structure and functional macroporosity along a clay gradient using x-ray computed tomography

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Naveed, Muhammad ORCID: https://orcid.org/0000-0002-0923-4976, Moldrup, Per, Arthur, Emmanuel, Wildenschild, Dorthe, Eden, Marie, Lamandé, Mathieu, Vogel, Hans-Jörg and de Jonge, Lis Wollesen (2013) Revealing soil structure and functional macroporosity along a clay gradient using x-ray computed tomography. Soil Science Society of America Journal, 77 (2). p. 403. ISSN 0361-5995

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Official URL: https://doi.org/10.2136/sssaj2012.0134

Abstract

The influence of clay content in soil-pore structure development and the relative importance of macroporosity in governing convective fluid flow are two key challenges toward better understanding and quantifying soil ecosystem functions. In this study, soil physical measurements (soil-water retention and air permeability) and x-ray computed tomography (CT) scanning were combined and used from two scales on intact soil columns (100 and 580 cm3). The columns were sampled along a natural clay gradient at six locations (L1, L2, L3, L4, L5 and L6 with 0.11, 0.16, 0.21, 0.32, 0.38 and 0.46 kg kg−1 clay content, respectively) at a field site in Lerbjerg, Denmark. The water-holding capacity of soils markedly increased with increasing soil clay content, while significantly higher air permeability was observed for the L1 to L3 soils than for the L4 to L6 soils. Higher air permeability values observed for 580- than 100-cm3 soil columns implied a scale effect and relatively greater importance of macropores in convective fluid flow at larger scale. Supporting this, x-ray CT showed that both interaggregate pores and biopores (pores formed by earthworms and plant roots) were present at L1 to L3 in decreasing order, whereas only interaggregate pores were observed at L4 to L6. Macroporosity inferred from x-ray CT to quantify pores >1 mm decreased from 2.9 to 0.1% from L1 to L6. A progressive improvement was observed in the linear relationship (R2 increasing 0.50–0.95) of air permeability with total air-filled porosity, CT-inferred macroporosity, and CT-inferred limiting macroporosity (minimum macroporosity for any quarter of soil column). The findings of this study show the immense potential in linking x-ray CT-derived soil-pore parameters with classical soil physical measurements for quantifying soil architecture and functions.

Item Type:	Article
Identifier:	10.2136/sssaj2012.0134
Subjects:	Construction and engineering > Civil and environmental engineering
Depositing User:	Muhammad Naveed
Date Deposited:	17 May 2018 14:45
Last Modified:	06 Feb 2024 15:57
URI:	https://repository.uwl.ac.uk/id/eprint/5002

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Revealing soil structure and functional macroporosity along a clay gradient using x-ray computed tomography

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