Impact of soil conditions on hydrology and water quality for a brown clay in the north-eastern cereal zone of Australia
Open Access
- 1 January 2009
- journal article
- Published by CSIRO Publishing in Soil Research
- Vol. 47 (4), 389-402
- https://doi.org/10.1071/sr07054
Abstract
Hydrology and water quality impacts of alternative land management practices are poorly quantified for semi-arid environments in the northern Australia cropping zone, yet wide-scale changes in tillage practices and land use were being recommended based on experience from other environments. The objective of this study was to explore changes in soil profile and catchment hydrology and water quality associated with different soil surface conditions created by different tillage and grazing practices. Soil water, runoff, and suspended sediment concentrations were monitored on 4 contour bay catchments over an 18-year period. Soil conditions were described by soil moisture, soil cover, and surface roughness in order to explore functional relationships between management, hydrology, and water quality. The site was chosen to represent the drier margins of cropping in southern Queensland where clay soils with high water-holding capacity, in conjunction with fallowing to store water for later crop growth, are an essential risk management tool. Accumulation of soil water in fallows was inefficient, with fallow efficiencies ranging from –7 to 40% due to high evaporation and runoff losses. Runoff amount was determined by soil water content, which was strongly influenced by antecedent rainfall, water use, and evaporation patterns. Surface cover and roughness had subtle influences on runoff, and a greater effect on suspended sediment concentration. Runoff and suspended sediment losses were considerably lower under pasture than cropping. A participative approach between farmers and scientists was demonstrated to be an efficient method to carry out an extensive and long-term catchment study at a remote location. This study provides benchmark data for future hydrologic and water quality investigations.Keywords
This publication has 20 references indexed in Scilit:
- The Brigalow Catchment Study: I. Overview of a 40-year study of the effects of land clearing in the brigalow bioregion of AustraliaSoil Research, 2007
- The Brigalow Catchment Study: II. Clearing brigalow (Acacia harpophylla) for cropping or pasture increases runoffSoil Research, 2007
- No-tillage and conservation farming practices in grain growing areas of Queensland - a review of 40 years of developmentAustralian Journal of Experimental Agriculture, 2007
- Component interactions in zero-till planters for heavy clay soils of southern QueenslandSoil and Tillage Research, 1991
- Effects of surface management on the hydrology of a vertisol in semi-arid AustraliaSoil and Tillage Research, 1990
- Antecedent Rainfall and Tillage Effects upon InfiltrationSoil Science Society of America Journal, 1989
- Evaluation of three soil erosion models for clay soilsSoil Research, 1989
- Long term trends in fertility of soils under continuous cultivation and cereal cropping in southern Queensland. I. Overall changes in soil properties and trends in winter cereal yieldsSoil Research, 1986
- A study of soil erosion on vertisols of the eastern Darling Downs, Queensland .I. Effects of surface conditions on soil movement within Contour Bay catchmentsSoil Research, 1986
- A study of soil erosion on vertisols of the eastern Darling Downs, Queensland .II. The effect of soil, rainfall, and flow conditions on suspended sediment lossesSoil Research, 1986