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Influence of antecedent soil moisture on hydraulic conductivity in a series of texture-contrast soils

Citation

Hardie, MA and Doyle, RB and Cotching, WE and Mattern, K and Lisson, S, Influence of antecedent soil moisture on hydraulic conductivity in a series of texture-contrast soils, Hydrological Processes, 26, (20) pp. 3079-3091. ISSN 0885-6087 (2012) [Refereed Article]

Copyright Statement

Copyright 2011 John Wiley & Sons, Ltd

DOI: doi:10.1002/hyp.8325

Abstract

Antecedent soil moisture significantly influenced the hydraulic conductivity of the A1, A2e and B21 horizons in a series of strong texture-contrast soils. Tension infiltration at six supply potentials demonstrated that in the A1 horizon, hydraulic conductivity was significantly lower in the ‘wet’ treatment than in the ‘dry’ treatment. However in the A2e horizon, micropore and mesopore hydraulic conductivity was lower in the ‘dry’ treatment than the ‘wet’ treatment, which was attributed to the precipitation of soluble amorphous silica. In the B21 horizon, desiccation of vertic clays resulted in the formation of shrinkage cracks which significantly increased near-saturated hydraulic conductivity and prevented the development of subsurface lateral flow in the ‘dry’ treatment. In the ‘wet’ treatment, the difference between the hydraulic conductivity of the A1 and B21 horizons was reduced; however, lateral flow still occurred in the A1 horizon due to difficulty displacing existing soil water further down the soil profile. Results demonstrate the need to account for temporal variation in soil porosity and hydraulic conductivity in soilwater model conceptualisation and parameterisation.

Item Details

Item Type:Refereed Article
Keywords:duplex soil, subsurface lateral flow, soil-water model, water repellent, vertic, preferential flow
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Soil Physics
Objective Division:Environment
Objective Group:Soils
Objective Field:Farmland, Arable Cropland and Permanent Cropland Soils
Author:Hardie, MA (Mr Marcus Hardie)
Author:Doyle, RB (Dr Richard Doyle)
Author:Cotching, WE (Dr Bill Cotching)
Author:Mattern, K (Ms Kathrin Mattern)
Author:Lisson, S (Dr Shaun Lisson)
ID Code:68643
Year Published:2012
Web of Science® Times Cited:8
Deposited By:Agricultural Science
Deposited On:2011-03-16
Last Modified:2013-06-06
Downloads:0

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