Grass Cover Influences Hydrophysical Parameters and Heterogeneity of Water Flow in a Sandy Soil

Lichner, Ľubomír; Eldridge, David J.; Schacht, Karsten; Zhukova, Natalia; Holko, Ladislav; Šír, Miloslav; Pecho, Jozef

doi:10.1016/s1002-0160(11)60175-6

Cited by 40 publications

(21 citation statements)

References 49 publications

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“…The tracer experiment in pure sand was carried out at the 50 cm × 100 cm plot and it is described in Lichner et al (2011). The effective cross section for water flow, ECS, and the degree of preferential flow, DPF, were determined from the stained area as follows.…”

Section: Methodsmentioning

confidence: 99%

Pines influence hydrophysical parameters and water flow in a sandy soil

et al. 2013

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Pines, used for sand dune stabilization, can influence the hydrophysical parameters and water flow in an aeolian sandy soil considerably, mainly due to soil water repellency. Two sites, separated by distance of about 20 m, formed the basis of our study. A control soil ("Pure sand") with limited impact of vegetation or organic matter was formed at 50 cm depth beneath a forest glade area. This was compared to a "Forest soil" in a 30-year old Scots pine (Pinus sylvestris) forest. Most of the hydrophysical parameters were substantially different between the two soil surfaces. The forest soil was substantially more water repellent and had two-times the degree of preferential flow compared to pure sand. Water and ethanol sorptivities, hydraulic conductivity, and saturated hydraulic conductivity were 1%, 84%, 2% and 26% those of the pure sand, respectively. The change in soil hydrophysical parameters due to soil water repellency resulted in preferential flow in the forest soil, emerging during a simulated heavy rain following a long hot, dry period. The wetting front established in pure sand exhibited a form typical of that for stable flow. Such a shape of the wetting front can be expected in the forest soil in spring, when soil water repellency is alleviated substantially.

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Section: Methodsmentioning

confidence: 99%

Pines influence hydrophysical parameters and water flow in a sandy soil

et al. 2013

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“…In this semiarid area 95% of precipitation is evaporated during the warm half-year. The soil is vegetated by different communities of plant species; grassland vegetation (consisting mostly of grass species of Poaceae family), 35-year-old Scots pine forest with patchy pattern of mosses and the bare-soil glade with patchy pattern of biological crust reported by Lichner et al (2011). The sediment has combined fluvial and eolian origin in this area giving to evolve the Typic Ustipsamment soil (Soil Survey Division Staff, 2010) with sandy texture.…”

Section: Materials and Methods Site Description And Soil Analysismentioning

confidence: 98%

“…We decided to use -20 mm pressure head to preserve consistency with previous or parallel measurements from the same location (e.g. Lichner et al, 2011). The total number of infiltration tests performed was: in the grassland soil 18 with water and 6 with ethanol, in the reference material 15 with water and 10 with ethanol, in the forest soil 18 with water and 6 with ethanol (Table 2).…”

Section: Water Repellency and Hygroscopicity Measurementsmentioning

confidence: 99%

Water vapour adsorption on water repellent sandy soils

Orfánus

Amer

Józefaciuk

et al. 2017

Journal of Hydrology and Hydromechanics

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Soil sorptivity is considered a key parameter describing early stages of water (rain) infiltration into a relatively dry soil and it is related to build-up complexity of the capillary system and soil wettability (contact angles of soil pore walls). During the last decade an increasing water repellency of sandy soils under pine forest and grassland vegetation has been frequently observed at Mlaky II location in SW Slovakia. The dry seasons result in uneven wetting of soil and up to hundredfold decrease in soil sorptivity in these vegetated soil as compared to reference sandy material, which was out of the reach of ambient vegetation and therefore readily wettable. As far as water binding to low moisture soils is governed by adsorption processes, we hypothesized that soil water repellency detected by water drop penetration test and by index of water repellency should also influence the water vapour adsorption parameters (monolayer water content, W m , specific surface area, A, maximum adsorption water, W a , maximum hygroscopic water M H , fractal dimension, D S and adsorption energies, E a ) derived from BET model of adsorption isotherms. We found however, that the connection of these parameters to water repellency level is difficult to interpret; nevertheless the centres with higher adsorption energy prevailed evidently in wettable materials. The water repellent forest and grassland soils reached less than 80% of the adsorption energy measured on wettable reference material. To get more conclusive results, which would not be influenced by small but still present variability of field materials, commercially available homogeneous siliceous sand was artificially hydrophobized and studied in the same way, as were the field materials. This extremely water repellent material had two-times lower surface area, very low fractal dimension (close to 2) and substantially lower adsorption energy as compared to the same siliceous sand when not hydrophobized.

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“…Dekker et al, 1999;Hallett et al, 2004;Lichner et al, 2003Lichner et al, , 2011Orfánus et al, 2014;Ritsema et al, 1997Ritsema et al, , 2005. Soil hydraulic conductivity is the most important hydrodynamic characteristics in most water-related studies in soil and on many physical processes active on its surface.…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of wetting characteristics in grassland sandy soil

Orfánus

Stojkovová

Rajkai

et al. 2016

Journal of Hydrology and Hydromechanics

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Abstract:In grasslands where organic and inorganic resources are alternating at scales of individual plants, the transient character is given to certain wetting properties of soil, which then become highly variable both in space and in time. The objective of presented study was to study wetting pattern within two soil horizons at 5-cm and 10-cm depths respectively and to examine how the wetting patterns relate to hydraulic conductivity determined by Minidisc infiltrometer at suction -2 cm, K (-2 cm) . This characteristics is implicitly independent on antecedent soil water content (SWC) since it relates to steady infiltration phase but can be influenced by present soil water repellency (SWR). Field measurements were performed on July 27-28, 2010 on the grassland experimental site located near the village Sekule in Southwest Slovakia. The water drop penetration time (WDPT), SWC and tension Minidisc infiltration measurements were carried out on the 0.64 m 2 plot in a regular 8 x 8 grid. The results showed that SWR and SWC influence each other and cause correlation between spatial patterns of studied soil wetting characteristics and between characteristics measured at the two soil depths. Further, it was found out, that calculation of K (-2 cm) according to Zhang may cause apparent correlation of K (-2 cm) with antecedent SWC, which is the artificial effect of sorptivity parameter in the equation on steady stage of infiltration process. This pseudocorrelation has disappeared after adopting of Minasny and McBratney (2000) approaches by calculation of K (-2 cm) .

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Grass Cover Influences Hydrophysical Parameters and Heterogeneity of Water Flow in a Sandy Soil

Cited by 40 publications

References 49 publications

Pines influence hydrophysical parameters and water flow in a sandy soil

Pines influence hydrophysical parameters and water flow in a sandy soil

Water vapour adsorption on water repellent sandy soils

Spatial patterns of wetting characteristics in grassland sandy soil

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