Quantity and Quality of Dispersed Fine Particles after the Low-Energy Water-Dispersible Soil Test: Impact of the Initial Soil Matrix Potential
Résumé
Transfer of <2-µm soil particles is a key process in the dispersion of pollutants and the textural differentiation of soil. Dispersion tests involving low-energy water-dispersible clay (LeWDC) are commonly used to indicate the stock of particles <2-µm that can be mobilized. However, notable differences in LeWDC protocols exist. We discuss the impact of the initial soil matrix potential on the dispersion sensitivity of <2-µm particles and the nature (mineralogy and particle size) of the dispersed particles. The dispersion sensitivity was more differentiated among soils with a high initial water content, which allows better soil discrimination. The nature of dispersed <2-µm particles was closer to that of the bulk <2-µm soil when moist initial conditions were considered, whereas enrichment in coarse clay minerals (with a particle-size mode of around 2 µm) was observed with dry initial conditions. Performing the LeWDC test under both moist and dry initial conditions can be used to interpret soil functioning. Abbreviations: CEC, cation exchange capacity; LEWDC: low-energy water-dispersible clay; OC, organic C; pF, log of soil water suction; XRD, x-ray diffraction.
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Supplementary_file_1__LEWDC_vf.pdf (97.38 Ko)
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