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Mathieu Lamandé

X-ray CT and laboratory measurements on glacial till subsoil cores – assessment of inherent and compaction-affected soil structure characteristics

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  • Mathieu Lamandé
  • Dorthe Wildenschild, School of Chemical, Biological and Environmental Engineering, Oregon State University, United States
  • Feto Esimo Berisso, Denmark
  • Amin Garbout, Denmark
  • Mike Marsh, VSG, Vizualisation Sciences Group, a FEI Company, Houston, Texas, United States
  • Per Møldrup, Institut for Kemi og Bioteknologi, Denmark
  • Thomas Keller, Agroscope Research Station ART, Department of Natural Resources & Agriculture, Zürich, Switzerland
  • Søren Baarsgaard Hansen
  • Lis Wollesen de Jonge
  • Per Schjønning
The aim of this study was to articulate the potential of medical computed tomographic (CT) scanning for analyzing soil structure (macroporosity, soil matrix density, number of macropores) and how these estimates compare with, and complement, traditional laboratory measurements (bulk density, total porosity, effective air-filled porosity, and air permeability). Undisturbed soil cores were sampled at two depths (0.35 and 0.7 m) in a long-term soil compaction experiment in southern Sweden 14 years after its establishment. Persistence of subsoil compaction was detectable by CT-estimated soil matrix density, bulk density, and total porosity. Vertical distribution of CT-estimated airfilled macroporosity between 0.25- and 0.45-m depth showed that biological
activity effect on macroporosity was largest in the top of the soil columns from the compacted plots, whereas reduction of macroporosity was significant at the bottom of the same columns. This was not detectable by classical laboratory measurements. Variations in air permeability could be related to the CT-estimated number of pores but not to the CT-estimated air-filled macroporosity. Despite using a coarse resolution, the combination of visualization and traditional laboratory measurements proved valuable in identifying the persistent effects of subsoil compaction and the differences in soil structure among the two
investigated subsoil layers. However, we recommend to systematically perform a sensitivity analysis to the segmentation threshold before any further analysis of CT-estimated parameters.
Original languageEnglish
JournalSoil Science
Volume178
Issue7
Pages (from-to)359-368
ISSN0038-075X
DOIs
Publication statusPublished - May 2013

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