Hillslope runoff and erosion on duplex soils in grazing lands in semi-arid central Queensland. III. USLE erodibility (K factors) and cover–soil loss relationships
D. M. SilburnA Agricultural Production Systems Research Unit, Department of Environment and Resource Management, PO Box 318, Toowoomba, Qld 4350, Australia. Email: mark.silburn@derm.qld.gov.au
B eWater Cooperative Research Centre, Innovation Centre, Building 22, University of Canberra, Canberra, ACT 2601, Australia.
Soil Research 49(2) 127-134 https://doi.org/10.1071/SR09070
Submitted: 21 April 2009 Accepted: 13 September 2010 Published: 10 March 2011
Abstract
Measured Universal Soil Loss Equation (USLE) soil erodibility (K) values are not available for soils in grazing lands in northern Australia. The K values extrapolated from croplands are used in national and river-basin scale assessments of hillslope erosion, using an assumption that the cover factor (C) equals 0.45 for undisturbed (uncultivated) bare soil. Thus, the K needed for input into the models is the measured K for undisturbed soil (KU) divided by 0.45.
Runoff and erosion data were available for 7 years on 12 hillslope plots with cover of 10–80%, with and without grazing, with and without tree canopy cover, on a variety of soils according to various soil classification systems. Soils were grouped into those derived from sandstone (SS), mudstone (MS), and eroded mudstone (MSe). These data were used to determine USLE KU, K, and C factor–cover relationships. Methods used to fit the parameters affected the results; minimising the sum of squares of errors in soil losses gave better results than fitting an exponential equation.
The USLE LS (length–slope) factor explained the increase in measured average annual soil loss with slope, for plots with low cover. Erodibility (K) was 0.042 for SS and MS soils, irrespective of Australian Soil Classification (Chromosol, Kandosol, Rudosol, Sodosol, Tenosol); K was 0.062 for exposed, decomposing mudstone (MSe Leptic Rudosol). The measured K factor for SS and MS soils was close to that used in catchment-wide soil loss estimation for the site (0.039). This indicates that the method used for estimating K from soil properties (derived from cultivated soils) gave a reasonable estimate of K for the main duplex soils at the study site, as long as the correction for undisturbed soil is used in deriving K from measured data and in applying the USLE model. A 20% increase in K (0.050) for SS and MS soils may be warranted for heavy grazing by cattle. The C factor–cover relationship was different from the standard revised USLE (RUSLE) relationship, requiring a greater exponent (‘bcov’) of 0.075, rather than the default for cropland of 0.035. Increasing cover is therefore more effective at the site than suggested by the USLE. Parameters of USLE were also derived for bedload, allowing suspended load to be calculated by subtracting bedload from total soil loss.
Additional keywords: C factor, pasture cover, sediment delivery.
References
Armour J, Hateley L, Pitt G (2007) ‘SedNet ANNEX modelling in the Tully Murray catchments.’ (Department of Natural Resources and Water: Mareeba, Qld)Bartley R, Hawdon A, Post DA, Roth CH (2007) A sediment budget in a grazed semi-arid catchment in the Burdekin basin, Australia. Geomorphology 87, 302–321.
| A sediment budget in a grazed semi-arid catchment in the Burdekin basin, Australia.Crossref | GoogleScholarGoogle Scholar |
Brough D, Lawrence P, Fraser G, Rayner D, Le Grand J (2004) Improved inputs for prediction of regional-scale soil erosion potential for Queensland. In ‘Conserving soil and water for society: sharing solutions. ISCO 2004 – 13th International Soil Conservation Organisation Conference’. Brisbane, July 2004. (Eds SR Raine, AJW Biggs, NW Menzies, DM Freebairn, PE Tolmie) (ASSSI/IECA: Brisbane, Qld)
Carnahan JA (1990) Vegetation. Vol. 6. In ‘Atlas of Australian resources. Third series.’ (Australian Surveying and Land Information Group, Department of Administrative Services: Canberra, ACT)
Carroll C (2004) Temporal changes to runoff and erosion processes on disturbed landscapes under natural rainfall. PhD Thesis, University of Queensland, Brisbane, Qld, Australia.
Carroll C, Merton L, Burger P (2000) Impact of vegetative cover and slope on runoff, erosion and water quality for field plots on a range of soil and spoil materials on central Queensland coal mines. Australian Journal of Soil Research 38, 313–327.
| Impact of vegetative cover and slope on runoff, erosion and water quality for field plots on a range of soil and spoil materials on central Queensland coal mines.Crossref | GoogleScholarGoogle Scholar |
Chilcott CR, Owens JS, Silburn DM, McKeon GM (2004) How long will soil resources last in semi-arid grazing systems? Paper 249. In ‘Conserving soil and water for society: sharing solutions. ISCO 2004. 13th International Soil Conservation Organisation Conference’. Brisbane, July 2004. (Eds SR Raine, AJW Biggs, NW Menzies, DM Freebairn, PE Tolmie) (ASSSI/IECA: Brisbane, Qld)
Ciesiolka CAA (1987) Catchment management in the Nogoa watershed. Research Project Completion Report, AWRC Project 80/128, Australian Water Resources Council, Department of Resources and Energy.
Ciesiolka CAA, Coughlan KJ, Rose CW, Escalante MC, Mohd. Hashim G, Paningbatan Jr EP, Sombatpanit S (1995) Methodology for a multi-country study of soil erosion management. Soil Technology 8, 179–192.
| Methodology for a multi-country study of soil erosion management.Crossref | GoogleScholarGoogle Scholar |
Cogle AL, Carroll C, Sherman BS (Eds) (2006) The use of SedNet and ANNEX models to guide GBR catchment sediment and nutrient target setting. Department of Natural Resources, Mines and Water, Brisbane, Qld, Report QNRM06138.
DeRose RC, Prosser IP, Wilkinson LJ, Hughes AO, Young WJ (2002) Regional patterns of erosion and sediment and nutrient transport in the Mary River Catchment, Queensland. CSIRO Land and Water, Canberra, Technical Report 37/02.
Freebairn DM, Silburn DM, Loch RJ (1989) Evaluation of three soil erosion models for clay soils. Australian Journal of Soil Research 27, 199–211.
| Evaluation of three soil erosion models for clay soils.Crossref | GoogleScholarGoogle Scholar |
Hutchinson ME, McIntyre S, Hobbs RJ, Stein JL, Garnett S, Kinloch J (2005) Integrating a global agro-climate classification with bioregional boundaries in Australia. Global Ecology and Biogeography 14, 197–212.
| Integrating a global agro-climate classification with bioregional boundaries in Australia.Crossref | GoogleScholarGoogle Scholar |
Isbell RF (1996) ‘The Australian Soil Classification’. Australian Soil and Lands Survey Handbook, Vol. 4. (CSIRO Publishing: Melbourne)
Janik LJ, Forrester ST, Rawson A (2009) The prediction of soil chemical and physical properties from mid-infrared spectroscopy and combined partial least-squares regression and neural networks (PLS-NN) analysis. Chemometrics and Intelligent Laboratory Systems 97, 179–188.
| The prediction of soil chemical and physical properties from mid-infrared spectroscopy and combined partial least-squares regression and neural networks (PLS-NN) analysis.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD1MXmtlWmtLY%3D&md5=8e63de3dae651b35aa7ccc6b41458dd2CAS |
Loch RJ (2000) Effects of vegetation cover on runoff and erosion under simulated rain and overland flow on a rehabilitated site on the Meandu Mine, Tarong, Queensland. Australian Journal of Soil Research 38, 299–312.
| Effects of vegetation cover on runoff and erosion under simulated rain and overland flow on a rehabilitated site on the Meandu Mine, Tarong, Queensland.Crossref | GoogleScholarGoogle Scholar |
Loch RJ, Rosewell CJ (1992) Laboratory methods for measurement of soil erodibilities (K Factors) for the Universal Soil Loss Equation. Australian Journal of Soil Research 30, 233–248.
| Laboratory methods for measurement of soil erodibilities (K Factors) for the Universal Soil Loss Equation.Crossref | GoogleScholarGoogle Scholar |
Loch RJ, Slater BK, Devoil C (1998) Soil erodibility (Km) values for some Australian soils. Australian Journal of Soil Research 36, 1045–1056.
| Soil erodibility (Km) values for some Australian soils.Crossref | GoogleScholarGoogle Scholar |
Lu H, Prosser IP, Moran CJ, Gallant JC, Priestley G, Stevenson JG (2003) Predicting sheetwash and rill erosion over the Australian continent. Australian Journal of Soil Research 41, 1037–1062.
| Predicting sheetwash and rill erosion over the Australian continent.Crossref | GoogleScholarGoogle Scholar |
McKeon GM, Day KA, Howden SM, Mott JJ, Orr DM, Scattini WJ, Weston EJ (1990) Management of pastoral production in Northern Australian savannas. Journal of Biogeography 17, 355–372.
| Management of pastoral production in Northern Australian savannas.Crossref | GoogleScholarGoogle Scholar |
Moss AJ, Green TW (1987) Erosive effects of the large water drops (gravity drops) that fall from plants. Australian Journal of Soil Research 25, 9–20.
| Erosive effects of the large water drops (gravity drops) that fall from plants.Crossref | GoogleScholarGoogle Scholar |
NLWRA (2001) Australian agriculture assessment. National Land and Water Resources Audit, Canberra. Available at: www.nlwra.gov.au/
O’Reagain PJ, Brodie J, Fraser G, Bushell JJ, Holloway CH, Faithful JW, Haynes D (2005) Nutrient loss and water quality under extensive grazing in the upper Burdekin river catchment, North Queensland. Marine Pollution Bulletin 51, 37–50.
| Nutrient loss and water quality under extensive grazing in the upper Burdekin river catchment, North Queensland.Crossref | GoogleScholarGoogle Scholar | 1:CAS:528:DC%2BD2MXitF2guro%3D&md5=ae1020cb6769d21d95b21e47cf2fd935CAS | 15757706PubMed |
Owens JS, Silburn DM, McKeon GM, Carroll C, Willcocks J, deVoil R (2003) Cover-runoff equations to improve simulation of runoff in pasture growth models. Australian Journal of Soil Research 41, 1467–1488.
| Cover-runoff equations to improve simulation of runoff in pasture growth models.Crossref | GoogleScholarGoogle Scholar |
Prosser IP, Hughes AO, Rustomji P, Young W, Moran CJ (2001) Assessment of river sediment budgets for the National Land and Water Resources Audit. CSIRO Land and Water, Canberra, Technical Report 15/01.
Prosser IP, Moran CJ, Lu H, Olley J, DeRose R, Cannon G, Croke B, Hughes A, Jakeman A, Newham L, Scott A, Weisse M (2003) Basin-wide mapping of sediment and nutrient exports in dryland regions of the Murray-Darling Basin. CSIRO Land and Water, Canberra, Technical Report 33/03.
Renard KG, Forster GA, Weesies DK, McCool DK, Yoder DC (1997) ‘Predicting soil erosion by water: A guide to conservation planning with the Revised Universal Soil Loss Equation.’ Agricultural Handbook 703. (United States Department of Agriculture: Washington, DC)
Rose CW (1985) Developments in soil erosion and deposition models. Advances in Soil Science 2, 1–63.
Rosenthal KM, White BJ (1980) Distribution of a rainfall erosion index in Queensland. Department of Primary Industries, Queensland, Division of Land Utilisation Report 80/8.
Rosewell CJ (1993) ‘SOILOSS – a program to assist in the selection of management practices to reduce erosion.’ Technical Handbook No. 11, 2nd edn (Soil Conservation Service of New South Wales: Sydney)
Rosewell CJ (1997) ‘Potential sources of sediments and nutrients: sheet and rill erosion and phosphorus sources, Australia.’ State of the Environment Technical Paper Series (Inland Waters) (Department of the Environment, Sport and Territories: Canberra, ACT)
Roth CH, Prosser IP, Post DA, Gross JE, Webb MJ (2003) Reducing sediment export from the Burdekin catchment. CSIRO Land and Water, Canberra, NAP3.224.
Scanlan JC, Pressland AJ, Myles DJ (1996) Run-off and soil movement on mid-slopes in north-east Queensland grazed woodlands. The Rangeland Journal 18, 33–46.
| Run-off and soil movement on mid-slopes in north-east Queensland grazed woodlands.Crossref | GoogleScholarGoogle Scholar |
Searle R (2005) Modelling of runoff, sediment and nutrient loads for the Maroochy river catchment using EMSS. Cooperative Research Centre for Catchment Hydrology. (ISBN 1-920813-27-6).
Silburn DM (2011) Hillslope runoff and erosion on duplex soils in grazing lands in semi-arid central Queensland. II. Simple models for suspended and bedload sediment. Soil Research 49, 118–126.
Silburn DM, Carroll C, Ciesiolka CAA, deVoil RC, Burger P (2011) Hillslope runoff and erosion on duplex soils in grazing lands in semi-arid central Queensland. I. Influences of cover, slope, and soil. Soil Research 49, 105–117.
Simanton JR, Rawitz E, Shirley ED (1984) The effect of rock fragments on erosion of semiarid rangelands. In ‘Erosion and productivity of soils containing rock fragments’. Soil Science Society of America, Special Publication 13. pp. 65–72. (Soil Science Society of America: Madison, WI)
Stern H, de Hoedt G, Ernst J (2003) Objective classification of Australian climates. Commonwealth Bureau of Meteorology, Melbourne, Vic. Available at: www.bom.gov.au/climate/environ/other/koppen_explain.shtml (accessed Oct. 2009).
Waters DK, Webb P (2007) The application of the E2 water quality model for regional NRM planning. In ‘MODSIM 2007: International Congress on Modelling and Simulation’. December 2007. (Eds L Oxley, D Kulasiri) pp. 888–894. (Modelling and Simulation Society of Australia and New Zealand)
Wischmeier WH (1976) Use and misuse of the Universal Soil Loss Equation. Journal of Soil and Water Conservation 31, 5–9.
Wischmeier WH, Smith DD (1978) ‘Predicting rainfall–erosion losses—a guide to conservation planning.’ United States Department of Agriculture, Agriculture Handbook No. 537. (US Government Printing Office: Washington, DC)
Wischmeier WH, Johnson CB, Cross BV (1971) A soil erodibility nomograph for farmland and construction sites. Journal of Soil and Water Conservation 26, 189–193.
Yu B, Rosewell CJ (1996) A robust estimator of the R-factor for the Universal Soil Loss Equation. Transactions of the American Society of Agricultural Engineers 39, 559–561.
