Quantity and Quality of Dispersed Fine Particles after the Low-Energy Water-Dispersible Soil Test: Impact of the Initial Soil Matrix Potential
2018
Samouëlian, Anatja | Quenard, Laurence | Cousin, Isabelle | Cornu, Sophie, S. | Laboratoire d'étude des Interactions Sol - Agrosystème - Hydrosystème (UMR LISAH) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Centre international d'études supérieures en sciences agronomiques (Montpellier SupAgro)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | Unité de Science du Sol (Orléans) (URSols) ; Institut National de la Recherche Agronomique (INRA) | Centre Européen de Recherche et d'Enseignement des Géosciences de l'Environnement (CEREGE) ; Institut de Recherche pour le Développement (IRD)-Institut National de la Recherche Agronomique (INRA)-Aix Marseille Université (AMU)-Collège de France (CdF (institution))-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National de la Recherche Scientifique (CNRS) | ANR-10-Blanc 605 | ANR-10-BLAN-0605,AGRIPED,Caractérisation, quantification et modélistion de l'impact de l'usage des terres sur un processus majeur d'évolution des sols : le lessivage.(2010)
International audience
Afficher plus [+] Moins [-]anglais. 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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