Impact of varying soil structure on transport processes in different diagnostic horizons of three soil types

Kodešová, Radka; Vignozzi, Nadia; Rohošková, Marcela; Hájková, Tereza; Kočárek, Martin; Pagliai, M.; Kozák, Josef; Šimůnek, Jirka

doi:10.1016/j.jconhyd.2008.10.008

Cited by 84 publications

(73 citation statements)

References 39 publications

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“…Aggregate coatings and biopore walls are characteristic soil structural features (e.g., Gerke and Köhne, 2002;Kodešová, 2009;Kodešová et al, 2011Kodešová et al, , 2015Rogasik et al, 2014) that are of great importance when attempting to describe preferential flow and transport processes in soils (e.g., Gerke, 2012;Kodešová, 2009;Kodešová et al, 2008Kodešová et al, , 2009Kodešová et al, , 2010Kodešová et al, , 2012. Clay-organic coatings often cover aggregates and biopores in the clay-illuviation Bt-horizons of Luvisols (IUSS Working Group WRB, 2014).…”

Section: Introductionmentioning

confidence: 99%

“…The coatings development in these horizons has been affected by the agricultural management (Jirků et al, 2013;Kodešová et al, 2011) causing frequent aggregate destruction in the top soil and accelerated clay migration within the soil profile. Studies by Kodešová et al (2009) and Kočárek et al (2010) showed that water flow and contaminant (in this case herbicide) transport was accelerated in both Bt horizons, due to preferential flow caused by soil aggregation and the restrictive impact of clay and organic matter coatings covering soil aggregates on water and solute transfer between macropores and soil matrix. Enhanced preferential flow in the Bt1 and Bt2 horizons and the low permeability of aggregate coatings (with respect to a Brilliant Blue FCF dye) was shown on the images of stained fieldscale sections and micromorphological images of stained thin soil sections, respectively .…”

Section: Introductionmentioning

confidence: 99%

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Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Fér

Leue

Kodešová

et al. 2016

Journal of Hydrology and Hydromechanics

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Abstract:The organo-mineral coatings of soil aggregates, cracks, and biopores control sorption and macropore-matrix exchange during preferential flow, in particular in the clay-illuvial Bt-horizon of Luvisols. The soil organic matter (SOM) composition has been hypothesized to explain temporal changes in the hydraulic properties of aggregate surfaces. The objective of this research was to find relations between the temporal change in wettability, in terms of droplet infiltration dynamics, and the SOM composition of coated and uncoated aggregate surfaces. We used 20 to 40 mm sized soil aggregates from the Bt2 horizon of a Haplic Luvisol from loess that were (i) coated, (ii) not coated (both intact), and (iii) aggregates from which coatings were removed (cut). The SOM composition of the aggregate surfaces was characterized by infrared spectroscopy in the diffuse reflection mode (DRIFT). A potential wettability index (PWI) was calculated from the ratio of hydrophobic and hydrophilic functional groups in SOM. The water drop penetration times (WDPT) and contact angles (CA) during droplet infiltration experiments were determined on dry and moist aggregate samples of the three types. The decrease in the CA with time was described using the power function (CA(t) = at -b ). For dry aggregates, the WDPT values were larger for coated as compared to uncoated regions on the aggregate surfaces, and increased with increasing PWI value (R 2 = 0.75). The a parameter was significantly related to the WDPT (R 2 = 0.84) and to the PWI (R 2 = 0.64). The relations between the b parameter and the WDPT (R 2 = 0.61) and the PWI (R 2 = 0.53) were also significant. The WDPT values of wet soil aggregates were higher than those of dry aggregates due to high water contents, which limited the droplet infiltration potential. At the wet aggregate surfaces, the WDPT values increased with the PWI of the SOM (R 2 = 0.64). In contrast to dry samples, no significant relationships were found between parameters a or b of CA(t) and WDPT or PWI for wet aggregate surfaces. The results suggest that the effect of the SOM composition of coatings on surface wettability decreases with increasing soil moisture. In addition to the dominant impact of SOM, the wettability of aggregate surfaces could be affected by different mineralogical compositions of clay in coatings and interiors of aggregates. Particularly, wettability of coatings could be decreased by illite which was the dominant clay type in coatings. However, the influence of different clay mineral fractions on surface wettability was not due to small number of measurements (2 and 1 samples from coatings and interiors, respectively) quantified.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Fér

Leue

Kodešová

et al. 2016

Journal of Hydrology and Hydromechanics

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“…Finally, Kodešová et al (2009) studied water flow and chlorotoluron transport in the undisturbed soil samples (taken from the various horizons of the same soils that were explored in previous paper) subjected to ponded infiltrations. Since the preferential flow was observed in all cases, the dual-permeability model in HYDRUS-1D was only applied to improve optimization results compared to the single-porosity model and to obtain bi-modal soil hydraulic properties.…”

Section: Soil Micromorphology Methods For Multiple Domain Parameter Ementioning

confidence: 99%

“…(2006Kodešová at al. ( , 2008Kodešová at al. ( , 2009 showed that even smaller pores may play a significant role.…”

Section: Benefits and Limitations Of Soil Micromorphology Approach Fomentioning

confidence: 99%

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Soil micromorphology use for modeling of a non-equilibrium water and solute movement

Kodešová¹

2009

PLANT SOIL ENVIRON

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Soil micromorphology was applied to specify flow domains in different soils and to select a suitable numerical model for simulation of water flow and herbicide transport. Pore structure detected on soil micromorphological images represented in all cases domains of prevailing water flow and solute transport. Depending on pore configuration and boundary conditions either water immobilization or preferential flow was observed and simulated. The benefits and limitations of the soil micromorphology imaging are discussed and compared with the more often used X-ray computer tomography, magnetic resonance imaging and dye tracer imaging.

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Influence of soil–water content on CO₂ efflux within the elevation transect heavily impacted by erosion

et al. 2018

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This study focused on the effects of organic carbon contents and soil hydraulic conditions on CO2 efflux. Samples were collected at 5 positions (summit, shoulder, backslope, footslope, and toeslope) of the elevation transect affected by erosion and the parent material (loess). Initially, air‐dried soil samples were placed on top of a clay tank, and the samples were wetted by capillary rise to soil saturation, and soil CO2 efflux was measured. Numerical inversions of the measured cumulative capillary rise and evaporation data using the HYDRUS‐1D program were applied to simulate the water regime in the columns and estimate the soil hydraulic parameters. In all cases, the net CO2 efflux (NCER) rapidly increased at the beginning of the wetting. NCER decreased with increasing soil–water content (summit, shoulder, backslope, and loess) or remained relatively stable (footslope and toeslope). The average soil–water content values at the maximal values of NCER (maxNCER) for the summit, shoulder, and footslope were similar. Lower average soil–water contents at maxNCER were simulated for the backslope, toeslope, and loess, which were attributed to the high contents of loess substrate in topsoil samples. The maxNCER measured on topsoils were closely related to the organic carbon contents (R = 0.94) and the maxNCER obtained on all samples correlated with the parameters αRES (R = 0.856) and nRES (R = −0.876) of the soil–water retention curves and saturated hydraulic conductivity (R = 0.856).

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Impact of varying soil structure on transport processes in different diagnostic horizons of three soil types

Cited by 84 publications

References 39 publications

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Soil micromorphology use for modeling of a non-equilibrium water and solute movement

Influence of soil–water content on CO₂ efflux within the elevation transect heavily impacted by erosion

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Impact of varying soil structure on transport processes in different diagnostic horizons of three soil types

Cited by 84 publications

References 39 publications

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Droplet infiltration dynamics and soil wettability related to soil organic matter of soil aggregate coatings and interiors

Soil micromorphology use for modeling of a non-equilibrium water and solute movement

Influence of soil–water content on CO2 efflux within the elevation transect heavily impacted by erosion

Contact Info

Product

Resources

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Influence of soil–water content on CO₂ efflux within the elevation transect heavily impacted by erosion