Quantification of soil volumes in the Eg&Bt-horizon of an Albeluvisol using image analysis

Abstract : In this study, we provide a strategy to quantify the effects on soil evolution of driving forces such as human activities or global change. This strategy was developed for situations in which soil evolution resulted in the formation of a complex juxtaposition of soil volumes with distinct properties including soil colours. It is based on image analysis. Our approach proceeds in two steps: (1) to find the minimum sample size over which the soil anisotropy can be neglected and (2) to define a Representative Elementary Volume (REV) of that sample. This approach was developed on the Eg&Bt horizon of a drained Albeluvisol in which three decimetric soil monoliths were sampled at 60, 110 and 210 cm from a drain. The monoliths were sliced in 1.5 cm horizontal layers. Each slice was photographed and studied by image analysis. At the monolith scale, there was neither lateral nor vertical anisotropy. The sampled monoliths were larger than the REV allowing quantification of the different soil volumes constituting this particular horizon. We quantified significant evolutions of the abundance of the different soil volumes characterized by their colour as a function of the distance to the drain. Such a quantification of the effects on soil evolution of human activities or global change equally applies for Podzols, Calcisols or Gleysols for which pedogenesis also resulted in contrasted soil colour evolutions.
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Submitted on : Thursday, October 5, 2006 - 4:04:53 PM
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David Montagne, Isabelle Cousin, Lydie Le Forestier, Joël Daroussin, Sophie Cornu. Quantification of soil volumes in the Eg&Bt-horizon of an Albeluvisol using image analysis. Canadian Journal of Soil Science, Agricultural Institute of Canada, 2007, 87, pp.51-59. ⟨hal-00103973⟩

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