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

Fér, Miroslav; Leue, Martin; Kodešová, Radka; Gerke, Horst H.; Ellerbrock, Ruth H.

doi:10.1515/johh-2016-0021

Cited by 39 publications

(35 citation statements)

References 50 publications

(77 reference statements)

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“…In fact, the relatively small amount of hydrophobic compounds could not be necessarily proportional to the amount of total OM (Doerr et al, 2000). A linear increasing relationship was found between WDPT and the potential wettability index that is the proportion of hydrophobic to hydrophilic functional groups (Fér et al, 2016;Leue et al, 2015). A similar result was found by Ellerbrock et al (2005) despite SWR was not directly correlated with OM.…”

Section: Resultsmentioning

confidence: 65%

“…In the spell between the two sampling campaigns conducted at Ciavolo, the WDPT decreased by a not significant 14% in the duff layer and increased by a factor of 2.5 in the mineral subsoil (Table 3). The observed decrease of WDPT was probably a consequence of the well document decrease of SWR as the initial water content increases (i.e., de Jonge et al, 1999;Dekker and Ritsema, 1994;Fér et al, 2016;Lichner et al, 2013a). For the mineral layer, the hydrophobicity increased notwithstanding the soil water content did not change and the organic matter content decreased ( Table 2) thus suggesting that amphiphilic hydrophobic compounds were probably leached from the surface duff as consequence of rainfall that occurred in autumn (Vogelmann et al, 2013).…”

Section: Resultsmentioning

confidence: 90%

“…It is generally found to be most extreme when soils are dry, declining and eventually disappearing as soils become wet (e.g., de Jonge et al, 1999;Dekker and Ritsema, 1994;Fér et al, 2016;Lichner et al, 2013a;Vogelmann et al, 2013) although the soil moisture water repellency relationship is nevertheless complex (Doerr et al, 2000). When wet, amphiphilic compounds produced by plants are hydrophilic, but below a critical moisture threshold, their hydrophilic ends are bond strongly with one another and the soil particles, while hydrophobic ends are oriented towards the free space inducing water repellency (Ma'shum and Farmer, 1985;Tschapek, 1984).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Application of minidisk infiltrometer to estimate water repellency in Mediterranean pine forest soils

Alagna

Iovino

Bagarello

et al. 2017

Journal of Hydrology and Hydromechanics

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Assessment of soil water repellency (SWR) was conducted in the decomposed organic floor layer (duff) and in the mineral soil layer of two Mediterranean pine forests, one in Italy and the other in Spain, by the widely-used water drop penetration time (WDPT) test and alternative indices derived from infiltration experiments carried out by the minidisk infiltrometer (MDI). In particular, the repellency index (RI) was calculated as the adjusted ratio between ethanol and water soil sorptivities whereas the water repellency cessation time (WRCT) and the specifically proposed modified repellency index (RI m ) were derived from the hydrophobic and wettable stages of a single water infiltration experiment. Time evolution of SWR and vegetation cover influence was also investigated at the Italian site. All indices unanimously detected severe SWR conditions in the duff of the pine forests. The mineral subsoils in the two forests showed different wettability and the clay-loam subsoil at Ciavolo forest was hydrophobic even if characterized by organic matter (OM) content similar to the wettable soil of an adjacent glade. It was therefore assumed that the composition rather than the total amount of OM influenced SWR. The hydraulic conductivity of the duff differed by a factor of 3.8-5.8 between the two forested sites thus influencing the vertical extent of SWR. Indeed, the mineral subsoil of Javea showed wettable or weak hydrophobic conditions probably because leaching of hydrophobic compounds was slowed or prevented at all. Estimations of SWR according to the different indices were in general agreement even if some discrepancies were observed. In particular, at low hydrophobicity levels the SWR indices gathered from the MDI tests were able to signal sub-critical SWR conditions that were not detected by the traditional WDPT index. The WRCT and modified repellency index RI m yielded SWR estimates in reasonable agreement with those obtained with the more cumbersome RI test and, therefore, can be proposed as alternative procedures for SWR assessment.

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Section: Resultsmentioning

confidence: 65%

Section: Resultsmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Application of minidisk infiltrometer to estimate water repellency in Mediterranean pine forest soils

Alagna

Iovino

Bagarello

et al. 2017

Journal of Hydrology and Hydromechanics

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“…Thereby they alter e.g., the chemical composition in terms of the ratio of hydrophobic and hydrophilic functional groups (C-H/C=O ratio), even after the root decayed completely (Haas et al, 2018) or the replenishment of earthworm casts stopped. The alteration of the C-H/C=O ratio goes along with changes in contact angles (Fér et al, 2016;Haas et al, 2018), resulting in altered in water contents (Figure 1). The latter one has a large impact on e.g., the oxygen diffusion coefficient of soils due to the 10,000 times higher diffusion coefficient of oxygen in air, compared to that one in water (Glinski and Stepniewski, 1985), resulting in a complex system of chemical, physical, and biological interactions (Figure 1).…”

Section: Introductionmentioning

confidence: 99%

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Haas

Horn

2018

Front. Environ. Sci.

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Macroscopic biopores, like earthworm burrows or channels which remain after a root decayed, act as preferential flow paths for water, gas, and heat transport processes, and viewing at agricultural production, as preferential elongation paths for plant roots. These processes result in intense alterations of the soil volume and its composition that surrounds the pores. The effects of these processes were analyzed at small-scale and physico-chemical soil parameters, i.e., relative oxygen diffusion coefficient (D s /D O ), oxygen partial pressure pO 2 , Eh and pH of biopore walls, were measured. The analyses were carried out on undisturbed soil samples with different colonization history, excavated from a haplic Luvisol derived from loess. Soil resistance to penetration was determined simultaneously with D s /D O and pO 2 using a coupled, self-developed approach, and four matric potentials (namely, m = −1 kPa; −3 kPa; −6 kPa or −30 kPa) were considered. We hypothesized that physico-chemical soil parameters in biopore walls were altered due to differing influences on the soil aggregation. Aggregation was visualized with scanning electron microscopy, classified and used to explain differences in-soil properties. Plant roots and earthworms altered aggregation next to biopore surfaces in a contrasted way, either by enhancing aggregates diversity or homogenizing it. Roots led to the formation of subpolyeders while earthworms formed subplates. Pore functions of microaggregates were comparable to those of larger scale, and subpolyeders showed much more favorable soil properties in terms of soil aeration (Ds/Do, pO2). Replicates of all parameters scattered intensely and showed deviations up to several orders of magnitude in case of D s /D O underlining the large variability of soil properties in biopore walls.

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“…In addition, sorption onto clayorganic coatings and onto aggregate matrix can differ due to different compositions of soil components in coatings and the soil matrix. Ellerbrock et al (2016), Fér et al (2016), and Leue et al (2010Leue et al ( , 2015Leue et al ( , 2016 documented that the aggregate coatings in the Bt horizons of Haplic Luvisols may contain a larger amount of organic matter of different quality in comparison to aggregate interiors, which may increases the sorption of some organic compounds. Both parts (i.e.…”

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confidence: 99%

Sorption of atenolol, sulfamethoxazole and carbamazepine onto soil aggregates from the illuvial horizon of the Haplic Luvisol on loess

Fér¹,

Kodešová²,

Golovko³

et al. 2018

Soil Water Res.

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Fér M., Kodešová R., Golovko O., Schmidtová Z., Klement A., Nikodem A., Kočárek M., Grabic R. (2018): Sorption of atenolol, sulfamethoxazole and carbamazepine onto soil aggregates from the illuvial horizon of the Haplic Luvisol on loess. Soil & Water Res., 13: 177−183.The leakage of pharmaceuticals present in soils towards groundwater is largely controlled by sorption of those compounds in soils. In some soils, soil aggregates are covered by coatings, which may have considerably different composition in comparison to that in an inner part of the aggregates. The aim of this study was to evaluate the sorption of three pharmaceuticals, which were applied in single or all compounds solutions, onto soil samples taken from the Bt horizon of a Haplic Luvisol. Analyses were performed on three types of disturbed soil samples: (1) entire aggregates, (2) aggregates from which coatings were removed, and (3) clay-organic coatings. Sorption of atenolol onto material from coatings was slightly higher than that onto material from the inner parts of the aggregates. On the other hand, sorption of sulfamethoxazole onto material from the coatings was lower than that from the aggregate interior. Both associates with a dominant fraction of clay particles (that are mostly negatively charged) in the coatings in comparison to soil composition in interiors and thus larger cation exchange capacity, which increased sorption of the positively charged atenolol and decreased sorption of the negatively charged sulfamethoxazole. Sorption of carbamazepine, which was in neutral form, did not substantially differ. The sorption of all three compounds did not decrease due to the competition between these compounds for the same sorption sites when applied simultaneously. Atenolol sorption was similar for both applications. Sorption of sulfamethoxazole increased when applied in solution with the other two compounds in comparison to its negligible sorption measured for the single compound solution likely due to sorption of the positively charged molecules of atenolol onto the negatively charged surface of soil components and reduction of repulsion between the soil components and the negatively charged molecules of sulfamethoxazole. Carbamazepine sorption also increased probably due to ionization of molecules due to dipole -induced dipole interaction between non-polar and polar molecules in solution.

show abstract

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

Cited by 39 publications

References 50 publications

Application of minidisk infiltrometer to estimate water repellency in Mediterranean pine forest soils

Application of minidisk infiltrometer to estimate water repellency in Mediterranean pine forest soils

Impact of Small-Scaled Differences in Micro-Aggregation on Physico-Chemical Parameters of Macroscopic Biopore Walls

Sorption of atenolol, sulfamethoxazole and carbamazepine onto soil aggregates from the illuvial horizon of the Haplic Luvisol on loess

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