Experimental approach of lessivage: Quantification and mechanisms

Cornu, Sophie; Quénard, Laurence; Cousin, Isabelle; Samouëlian, Anatja

doi:10.1016/j.geoderma.2013.08.012

Cited by 26 publications

(20 citation statements)

References 34 publications

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“…Initially high colloid concentrations in the effluent of the LV columns ( Fig. 8) were reported also in other column studies of topsoil Ap horizons (e.g., Kjaergaard et al, 2004c;Glaesner et al, 2011b) and subsoil E horizons (Cornu et al, 2014). In this study, the columns of the LV profile showed a much higher initial concentration (i.e., up to 320 mg L −1 for LV1-3 and even 2814 mg L −1 for LV3-3) compared with the RG columns with a maximum of 134 mg L −1 for RG1-2.…”

Section: Mobilization Of Colloidssupporting

confidence: 81%

“…The mobilization of colloids depends strongly on the clay content but is also sensitive to soil mineralogy and soil chemistry if the applied energy input in the dispersion procedure is kept low (Kjaergaard et al, 2004a). Cornu et al (2014) observed in column percolation studies that the background concentration of leached clay particles was positively correlated with rain intensity, while peak concentrations were linked to rapid drainage during the percolation period and increased with suction applied at the lower boundary after irrigation. Kjaergaard et al (2004b) hypothesized that the mobilization of mineral colloids was facilitated by an initially high DOC leaching.…”

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confidence: 99%

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Tracer, Dissolved Organic Carbon, and Colloid Leaching from Erosion‐Affected Arable Hillslope Soils

Rieckh

Gerke

Glæsner

et al. 2015

Vadose Zone Journal

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Core Ideas Pedogenetic processes are spatially related to the slope positions in arable soil landscapes. The Regosol is affected by erosion‐induced CaCO3 and reduced organic C contents. The leaching potential for colloids and DOC was reduced in the truncated Regosol soil. Soil erosion modifies transport properties in the form of the effective dispersivity. In a morainic arable soil landscape, tillage and water erosion created truncated soil profiles at exposed steep slope positions and colluvial soils in depressions. This study examined the effects of erosion‐induced pedogenetic dynamics on flow and transport properties, colloid mobilization, and dissolved organic C (DOC) leaching for an uneroded Luvisol (LV) at the plateau and a strongly eroded Regosol (RG) at the slope position. Unsaturated steady‐flow experiments were performed on intact soil columns (20‐cm diameter, 16–18 cm high) extracted from the Luvisol (Ap, E, and Bt horizons; three depths) and the Regosol (Ap and CBkl horizons; two depths) in three replicates. Together with a 3H2O tracer, the leaching of colloids and DOC and the electrical conductivity were determined in the percolate. Colloid concentration was obtained from turbidity data. Effective dispersion coefficients, Deff, were determined by fitting the convection–dispersion equation and the mobile–immobile transport model (program CXTFIT) to 3H2O breakthrough curves (BTCs). Values of Deff were lower for Luvisol (20.1 ± 0.3 cm2 d−1; mean ± standard deviation) than for Regosol columns (30.2 ± 12.6 cm2 d−1). The pore structure of the Regosol topsoil was influenced by incorporation of CaCO3 from glacial till. The plow pan in the Luvisol caused an increased heterogeneity in the BTCs. Differences in transport properties and leaching potentials for colloids (LV: 98 ± 9 mg L−1; RG: 15 ± 4 mg L−1) and DOC (LV: 13.7 ± 3.7 mg L−1; RG: 6.9 ± 1.1 mg L−1) suggested a gradual change in the solid‐phase composition and structure of these contrasting soils.

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Section: Mobilization Of Colloidssupporting

confidence: 81%

mentioning

confidence: 99%

Tracer, Dissolved Organic Carbon, and Colloid Leaching from Erosion‐Affected Arable Hillslope Soils

Rieckh

Gerke

Glæsner

et al. 2015

Vadose Zone Journal

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“…The mean annual effective rainfall (precipitation minus evapotranspiration) in the young morainic landscapes of north Poland is approximately 300 mm (Merot et al, 2003) which stimulates the development of clay eluviation (Arkley, 1967). Unconsolidated materials that are generally of loamy or sandy loamy texture are highly suitable for the vertical flux of water (Quénard et al, 2011;Cornu et al, 2014).…”

Section: Discussionmentioning

confidence: 99%

Luvisols or Cambisols? Micromorphological study of soil truncation in young morainic landscapes — Case study: Brodnica and Chełmno Lake Districts (North Poland)

Świtoniak

Mroczek

Bednarek

2016

CATENA

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“…The two soil cores, referenced L20‐1 and L6‐4, were initially sampled from 35‐ to 50‐cm depth in a cultivated field near Saint‐Ouen‐de‐la‐Cour, France (48.407° N lat, 0.590° E long) to study clay translocation in an eluvial horizon of Luvisol (Cornu et al, 2014). To collect the samples, PVC tubes were slowly and vertically pressed into the soil.…”

Section: Methodsmentioning

confidence: 99%

Identifying the Functional Macropore Network Related to Preferential Flow in Structured Soils

Sammartino

Lissy

Bogner

et al. 2015

Vadose Zone Journal

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International audienceUnderstanding the processes and mechanisms that control preferential flow in soils in relation to the properties of their structures is still challenging since fast flow and transport occur in a small fraction of the porosity, that is, the functional macropore network, making it difficult to image and characterize these processes at decimeter scales. The aim of the paper was therefore to propose a new image acquisition and analysis methodology to characterize preferential flow at the core scale and identify the resulting active macropore network. Water infiltration was monitored by a sequence of three-dimensional images (taken at 5-, 10-, or 15-min intervals) with an X-ray scanner that allows very fast acquisitions (10 s for a 135-mm diameter). A simultaneous dye tracer experiment was also conducted. Water infiltration was then imaged at each acquisition time by the voxels impacted by water during infiltration, named the water voxels. The number of times a voxel was impacted by water during the experiment was converted into data reflecting the water detection frequency at the given position in the soil column, named the local detection frequency. Compared with dye staining, the active macropore network was defined by macropores in which water voxels were the most frequently detected during the experiment (local detection frequency above 65%). The geometric properties of this active network, such as the connectivity, were significantly different from those of the total structure. This image processing methodology coupled to dynamic acquisitions can be used to improve the analysis of preferential flow processes related to soil structures at the core scale

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Experimental approach of lessivage: Quantification and mechanisms

Cited by 26 publications

References 34 publications

Tracer, Dissolved Organic Carbon, and Colloid Leaching from Erosion‐Affected Arable Hillslope Soils

Tracer, Dissolved Organic Carbon, and Colloid Leaching from Erosion‐Affected Arable Hillslope Soils

Luvisols or Cambisols? Micromorphological study of soil truncation in young morainic landscapes — Case study: Brodnica and Chełmno Lake Districts (North Poland)

Identifying the Functional Macropore Network Related to Preferential Flow in Structured Soils

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