Soil hydraulic properties as related to soil structure

Kutílek, Miroslav

doi:10.1016/j.still.2004.07.006

Cited by 170 publications

(118 citation statements)

References 13 publications

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“…We assume that the substantial difference from loamy soils is due to very feeble aggregation of sands. We are confirming the earlier statement (Kutílek 2004) that the poor soil structure has the consequence in decrease of the absolute value of h A up to the extreme of h A = 0, or to transition of bi-modal to mono-modal soil porous system The data in Table 2 show that a fixed constant boundary between structural and matrix domains does not exist. The separation of effective porosity by Ahuja et al (1984), or the boundaries of macro-, mezzo-and micro-porosity of Luxmoore (1981) are not corresponding to the real pore size distributions in soils.…”

Section: S12supporting

confidence: 90%

“…(4) of soil water retention curve and Eq. (2) of relative saturation of soil by water have the forms for bi-modal soils (Kutílek 2004) (8) …”

Section: Theorymentioning

confidence: 99%

“…For structural domain we took θ R2 = 0. Kosugi's unsaturated relative hydraulic conductivity K R is modified to bi-modal soil in a similar way as the soil water retention function (Kutílek 2004) (17) The subscripts in parameters α i , β i , γ i , reflect the assumption that values of parameters differ for the two domains. Since parameters h mi and σ I are known from the evaluation of the water retention curve (Eq.…”

Section: S10mentioning

confidence: 99%

“…(1) to get the equation of the relative unsaturated hydraulic conductivity K R (h). We obtain after rearrangement of his equations (Kutílek 2004) …”

mentioning

confidence: 99%

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The structural porosity in soil hydraulic functions - a review

Kutílek¹,

Jendele²

2008

Soil & Water Res.

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Products of biological processes are the dominant factor of soil structure formation in A horizons, while in B horizons their role is less expressed. Soil structure influences dominantly the structural domain of the pore system in bimodal soils thus affecting soil hydraulic functions. The form of soil hydraulic functions depends upon the pore size distribution and generally upon configuration of the soil pore system. We used the functions derived for the lognormal pore size distribution and modified them to bi-modal soils. The derived equations were tested by experimental data of catalogued soils. The procedure leads to the separation of two mutually different domains of structural and matrix pores. The value of the pressure head (potential) separating the two domains is not constant and varies in a broad range. For each domain we obtained its water retention function and unsaturated hydraulic conductivity function. The separation of hydraulic functions for the two domains is a key problem in the solution of preferential flow and in controlling lateral flow between the structural and matrix domains. Water retention function is fully physically based while the conductivity function still keeps fitting parameters, too. Their simple relationship to tortuosity and pores connectivity was not confirmed. Since they differ substantially for matrix and structural domains, we suppose that there exists a great difference in configuration of porous systems in structural and matrix domains. The use of uniform fitting conductivity parameters for the whole range of pores is not justifiable.

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Section: S12supporting

confidence: 90%

“…(4) of soil water retention curve and Eq. (2) of relative saturation of soil by water have the forms for bi-modal soils (Kutílek 2004) (8) …”

Section: Theorymentioning

confidence: 99%

Section: S10mentioning

confidence: 99%

“…(1) to get the equation of the relative unsaturated hydraulic conductivity K R (h). We obtain after rearrangement of his equations (Kutílek 2004) …”

mentioning

confidence: 99%

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The structural porosity in soil hydraulic functions - a review

Kutílek¹,

Jendele²

2008

Soil & Water Res.

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“…It is known that aggregated soils present differences between textural and structural pores (Kutílek 2004). Textural pores are basically related to the dis- tribution of primary soil particles (sand, silt and clay), and structural ones are associated with shape, orientation and position arrangement of soil aggregates (Nimmo 1997).…”

Section: Resultsmentioning

confidence: 99%

Chemical migration during soil water retention curve evaluation

Pires

Villanueva²,

Dias

et al. 2011

An. Acad. Bras. Ciênc.

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Wetting and drying (W-D) cycles can induce important elemental migrations in soils. The main purpose of this work was to study the possible existence of soil chemical elemental migrations in samples submitted to repeated W-D cycles during evaluations of soil water retention curve (SWRC). The experimental measurements were carried out by Atomic Absorption Spectrometry (AAS) for Ca 2+ , Mg 2+ and K + on samples of three different Brazilian tropical soils (Geric Ferralsol, Eutric Nitosol and Rhodic Ferralsol). Results demonstrate an increase in the electrical conductivity of the water extracted from the samples and significant losses of Ca 2+ , Mg 2+ and K + during the applications of up to nine W-D cycles. It was also observed differences in SWRC for all soils when samples submitted to the application of several W-D cycles were compared with samples not submitted to it. These differences occurred at the region of both structural and textural pores. A possible explanation for these results could be the soil chemical migration during the sequences of W-D cycles, which can affect the soil structure development.

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