Natural soil water repellency in different types of Mediterranean woodlands

Zavala, Lorena M.; García‐Moreno, Jorge; Gordillo‐Rivero, Ángel J.; Jordán, António; Mataix-Solera, Jorge

doi:10.1016/j.geoderma.2014.02.009

Cited by 33 publications

(21 citation statements)

References 76 publications

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“…Several factors could affect soil wettability, one of them is clay content. For disturbed soil samples, clay content increased WDPT and CA in non-repellent soils (Leelamanie and Karube, 2011;Leelamanie et al, 2010), whereas in slightly to severely repellent soils, decrease these values (McKissock et al, 2002;Zavala et al, 2014). However, soil wettability is mainly controlled by the content of soil organic matter (SOM) (e.g.…”

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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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%

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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“…The severity of SWR significantly varies depending on vegetation species and soil depths (Doerr et al, 2002Buczko et al, 2005;de Blas et al, 2010de Blas et al, , 2013Neris et al, 2012;Mao et al, 2014;Zavala et al, 2014). For instance, soil under eucalyptus always showed more severe water repellency than under pine during dry periods in northwest Spain Benito, 2011, 2012).…”

Section: Introductionmentioning

confidence: 99%

Predicting soil water repellency using hydrophobic organic compounds and their vegetation origin

Mao

Nierop

Rietkerk

et al. 2015

SOIL

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Abstract. It is widely accepted that soil water repellency (SWR) is mainly caused by plant-derived hydrophobic organic compounds in soils; such hydrophobic compounds are defined as SWR markers. However, the detailed influence of SWR markers on SWR is yet unclear and the knowledge of their original sources is still limited. The aims of this study are to select important SWR markers to predict SWR based on their correlation with SWR and to determine their origin. In our study, sandy soils with different SWR were collected, along with their covering vegetation, i.e. plant leaves/needles and roots. A sequential extraction procedure was applied to the soils to obtain three organic fractions: dichloromethane (DCM)/MeOH soluble fraction (D), DCM/MeOH insoluble fraction of isopropanol/ammonia solution (IPA/NH 3 ) extract (AI) and DCM/MeOH soluble fraction of IPA/NH 3 extract (AS), which were subdivided into 10 dominant SWR marker groups: D fatty acid, D alcohol, D alkane, AI fatty acid, AI alcohol, AI ω-hydroxy fatty acid, AI α,ω-dicarboxylic acid, AS fatty acid, AS alcohol and AS ω-hydroxy fatty acid. Waxes and biopolyesters of the vegetation were also sequentially extracted from plants. The soils with higher SWR have significantly higher relative concentrations of AS alcohols. A number of indications suggest that AS alcohols are mainly derived from roots and most likely produced by microbial hydrolysis of biopolyesters (mainly suberins). In addition, the strong correlation between the biomarkers of plant tissues and SWR markers in soils suggests that it is more accurate to predict SWR of topsoils using ester-bound alcohols from roots, and to predict SWR of subsoils using root-derived ω-hydroxy fatty acids and α,ω-dicarboxylic acids. Considering the sandy soils studied here, the relationships we obtained need to be tested for other types of soils. Our analysis indicates that plant roots have a primary role influencing SWR relative to plant leaves.

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“…Although strong relations between soil WR and soil properties have been reported in many areas (Mataix‐Solera et al ., ; Zavala et al ., ; Mataix‐Solera et al ., ; Mataix‐Solera et al ., ; Zavala et al ., ), no relevant correlations have been observed in this research at the working scale. On the other hand, the spatial distribution of soil WR in the study area is strongly conditioned by vegetation, in agreement with results reported by other authors, who observed that, in areas with homogeneous soil properties, vegetation is the main factor controlling soil WR (Doerr et al ., ; Cerdà et al ., ; Buczko et al ., ; Cerdà & Doerr, ; Jordán et al ., ; Jordán et al ., ; Bodí et al ., ; Granged et al ., ; Bodí et al ., ; Zavala et al ., ; Jiménez‐Pinilla et al ., ).…”

Section: Discussionmentioning

confidence: 97%

“…Other factors, like fire, may have no impact, destroy or enhance soil WR (Doerr et al ., ; Jordán et al ., ; Pereira et al ., ). Consequently, different authors have investigated the natural soil WR background in different areas as USA (Pierson et al ., ; Doerr et al ., ), Iran (Mirbabaei et al ., ), Mexico (Jordán et al ., ), Spain (Rodríguez‐Alleres et al ., ; Zavala et al ., ), South Africa (Scott, ) or Australia (Blackwell, ).…”

Section: Introductionmentioning

confidence: 99%

Spatial Gradients of Intensity and Persistence of Soil Water Repellency Under Different Forest Types in Central Mexico

et al. 2016

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Organic residues release hydrophobic compounds to the soil that may induce soil water repellency (WR), which may inhibit infiltration and increase runoff and soil loss rates. Although there are many studies on soil WR through the world, very few investigations have been conducted in Mexican areas. This paper studies the natural background of soil WR in soils from central Mexico under representative forest types, analyzing the spatial distribution of soil WR in relation with tree canopy, vegetation cover and main soil chemical (pH, CaCO3, organic C content and exchangeable cations) and physical properties (texture). The water drop penetration time and the ethanol tests were used to assess persistence and intensity of soil WR, respectively. Although soil WR was not related with soil properties, it decreased strongly from soil below the canopy of conifers to soil below oaks. When different types of vegetation cover were considered, the proportion of water‐repellent soil increased following the sequence: bare soil < shrubs and herbaceous plants < shrubs < trees from fir, fir‐pine‐oak and pine‐oak forest. We found an inverse relation with distance to the tree trunks, contributing to create a patchy pattern of soil WR, with soils under the canopy of conifers showing the most severe WR levels. The spatial distribution of soil WR is also conditioned by microclimatic gradients, as persistence and intensity of soil WR were usually lower in shaded areas (upslope transects from the tree trunks), where soil moisture content is expected to be higher on average through the year. Copyright © 2016 John Wiley & Sons, Ltd.

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Natural soil water repellency in different types of Mediterranean woodlands

Cited by 33 publications

References 76 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

Predicting soil water repellency using hydrophobic organic compounds and their vegetation origin

Spatial Gradients of Intensity and Persistence of Soil Water Repellency Under Different Forest Types in Central Mexico

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