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Hydropedology and preferential flow in the Tasmanian texture-contrast soils

Citation

Hardie, M and Doyle, R and Cotching, W and Holz, G and Lisson, S, Hydropedology and preferential flow in the Tasmanian texture-contrast soils, Vadose Zone Journal, 12, (4) pp. 1-14. ISSN 1539-1663 (2013) [Refereed Article]

Copyright Statement

Copyright 2013 Soil Science Society of America

DOI: doi:10.2136/vzj2013.03.0051

Abstract

The two-way interaction between soil morphology and the processes governing soil water movement were investigated for a range of texture-contrast soil profiles. The texture-contrast soils consisted of a seasonally water-repellent sandy loam A1 horizon over a bleached silica-cemented A2e horizon and a mottled vertic clay subsoil. Differences in soil morphology and structure among sites had little influence on the proportion of soil that participated in infiltration or the maximum depth of infiltration; however, differences in subsoil structure influenced the processes by which water infiltrated and was stored within the B2 horizons. The occurrence of preferential flow was largely controlled by the effects of antecedent soil moisture content on water repellence in the A1 horizon, silica bridging in the A2e horizon, and clay shrinkage in the B2 horizons. Under dry soil conditions, infiltration resulted from up to five different forms of preferential flow. When soils were near field capacity, most forms of preferential flow ceased; however, wetting front instability and lateral flow developed in the A1 horizon. Preferential flows are not thought to have contributed to the pedogenesis of the texture-contrast soils. Development of the contrasting soil texture horizons, sand infills, and bleached A2e horizons developed before and independently of the observed preferential flow processes in which reworked aeolian sands buried previously developed clay columns.

Item Details

Item Type:Refereed Article
Keywords:hydropedology, preferential flow, Tasmania, soil
Research Division:Environmental Sciences
Research Group:Soil Sciences
Research Field:Soil Sciences not elsewhere classified
Objective Division:Environment
Objective Group:Land and Water Management
Objective Field:Farmland, Arable Cropland and Permanent Cropland Water Management
Author:Hardie, M (Mr Marcus Hardie)
Author:Doyle, R (Dr Richard Doyle)
Author:Cotching, W (Dr Bill Cotching)
Author:Holz, G (Dr Greg Holz)
Author:Lisson, S (Dr Shaun Lisson)
ID Code:88136
Year Published:2013
Web of Science® Times Cited:8
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2014-01-13
Last Modified:2017-10-31
Downloads:0

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