Soil organic carbon fractions and aggregate stability in carbonated and no carbonated soils in Tunisia

  • Bouajila A
  • Gallali T
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Abstract

This research aimed to study the relationship between different organic matter fractions and aggregate stability in carbonated and no carbonated soils in Tunisia. Samples of soil were taken from A or Ap horizon at twelve carbonated and ten no carbonated soils. Aggregate stability was tested by Le Bissonnais method. Total soil organic carbon (SOC), particulate organic carbon (POC), hot-water-extract-polysaccharides (HWEP) and humic compounds (HC: humic acids (HA) and fulvic acids (FA)) were analysed. Both carbonated and no carbonated horizons showed high SOC and POC contents, notably under forest. While, HWEP and HC (HA and FA) contents were greater in no carbonated soils. Across all horizons, positive correlation was found between SOC and POC Soil stability test showed that horizons were affected by fast wetting rather than mechanical breakdowns (MWDFW

Author-supplied keywords

  • Aggregate stability
  • Calcium carbonate
  • Humic compounds
  • Organic carbon
  • Particulate organic carbon
  • Polysaccharides

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Authors

  • Adelhakim Bouajila

  • T. Gallali

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