1887
Volume 33, Issue 2
  • ISSN: 0812-3985
  • E-ISSN: 1834-7533

Abstract

A quantitative investigation was undertaken to ascertain the relationships between radiometrics and surface soil properties within a 77 km2 survey area, on the Elashgin Creek catchment, Wyalkatchem, Western Australia. A high-resolution airborne gamma-ray survey, with a measurement ‘footprint’ width of approximately 40 m and length of 80 m, provided measurements of radionuclide distributions across the study area. Ground-based gamma-spectrometry measurements, with a much smaller ‘footprint’ of one metre diameter, were also made at the majority of sampling sites. Field texture and gravel content from 132 sampling sites were recorded, with particle-size and mineralogical analysis conducted on a selection of sites. Mineralogical analysis provided an understanding of the sources of radionuclides. Using discriminant function analysis (DFA), areas of shallow soil over rock and rock outcrop were successfully discriminated using airborne radiometric and DEM data. The presence or absence of gravel grades was also successfully discriminated with radiometric data using DFA. In addition, a statistically significant correlation was identified between airborne thorium/potassium ratio and ironstone gravel content in the top 0 to 10 cm of soil (r2 = 0.56, P-value < 0.001). Stronger linear relationships were identified between airborne data and surface texture (e.g., 0–10 cm % clay and total count, r2 = 0.71, P-value < 0.001). Signal attenuation prevented the accurate determination of deeper subsurface soil texture (e.g., 20–30 cm % clay and total count, r2 = 0.24, P-value < 0.05). Of the airborne radiometric data, total count exhibited the strongest correlation to soil texture and potassium the least. It is concluded that high-resolution radiometric data can aid the mapping of important soil properties such as shallow granitic bedrock, presence or absence of gravel and the percentage clay in the top 0–10 cm of soil.

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2002-06-01
2026-01-25

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References

  1. Aspin S.J. and Bierwirth P.N., 1997, GIS analysis of the effects of forest biomass on gamma-radiometric images: Proceedings of the 3rd National Forum on GIS in the Geosciences, Australian Geological Survey Organisation Record 1997/36.
  2. Bierwirth P., Gessler P. and McKane D., 1996, Empirical investigation of airborne gamma-ray images as an indicator of soil properties: 8th Australasian Remote Sensing Conference, Canberra.
  3. Bierwirth P.N., Hardy S., Wilson P., Philip S., Smith D., Heiner I. and Grundy M., 1997, Radio Ga Ga – Integrating gamma-radiometrics into landscape modelling of soil attributes: results of an ACLEP exchange: Australian Collaborative Land Evaluation Program Newsletter, 6, 15–18.
  4. Chin R.J., 1986, 1:250 000 geological series-explanatory notes, Kellerberrin, Western Australia. Sheet 50–15: Geological Survey of Western Australia.
  5. Cook S.E., Corner R.J., Groves P.R., and Grealish G.J., 1996, Use of gamma radiometric data for soil mapping: Australian Journal of Soil Research, 34, 183–194.
  6. Cooper S., Crossley N., Cummins D., Drysdale G., Denham R., Galloway P., Lacey T., Lauk H., Smith J. and Wyland J., 2001, Elashgin focus catchment report: Agriculture Western Australia (unpublished).
  7. Day P.R., 1965, Particle fraction standard particle size analysis, in Methods of soil analysis, Part 1, Agronomy Series No.9: American Society of Agronomy.
  8. Dickson B.L. and Scott K.M., 1997, Interpretation of aerial gamma-ray surveys - adding the geochemical factors: AGSO Journal of Australian Geology & Geophysics, 17, 187–200.
  9. Duval J.S., Cook B. and Adams J.A.S., 1971, Circle of investigation of an airborne gamma-ray spectrometer: Journal of Geophysical Research, 76, 8466–8470.
  10. Dytham C., 1999, Choosing and using statistics: a biologists guide: Blackwell Science Ltd.
  11. Environmental Research and Information Consortium Pty. Ltd., 1997, Gamma-ray data in soil property mapping: Australian Collaborative Land Evaluation Program Newsletter, 6, 19–20.
  12. Galbraith J.H. and Saunders D.F., 1983, Rock classification by characteristics of aerial gamma-ray measurements: Journal of Geochemical Exploration, 18, 49–73.
  13. Gaskin G.J. and Miller J.D., 1996, Measurement of soil water content using a simplified impedance measuring technique: Journal of Agricultural Engineering Research, 63, 153–160.
  14. Gourlay R. and Sparks T., 1996, Value adding to radiometrics for mapping soil properties: 8th Australasian Remote Sensing Conference, Canberra.
  15. Harper R., 1994, The nature and origin of the soils of the Cairlocup area, Western Australia, as related to contemporary land degradation: Ph.D. Thesis, Faculty of Agriculture, University of Western Australia.
  16. Hunt N. and Gilkes R., 1992, Farm monitoring handbook: University of Western Australia.
  17. International Atomic Energy Agency, 1991, Airborne gamma-ray spectrometer surveying: Technical Report Series, No. 323.
  18. Kiss J.J., De Jong E. and Bettany J.R., 1988, The distribution of natural radionuclides in native soils of the Southern Saskatchewan, Canada: Journal of Environmental Quality, 17, 437–444.
  19. Lantzke N., 1992, Soils of the Northam Advisory District. The Zone of Ancient Drainage, Bulletin 4244: Agriculture Western Australia.
  20. Lide D.R., 1999, CRC Handbook of Chemistry and Physics: CRC Press.
  21. McArthur W.M., 1991, Reference soils of Western Australia: Agriculture Western Australia.
  22. Megumi K. and Mamuro T., 1977, Concentrations of uranium series nuclides in soil particles in relation to their size: Journal of Geophysical Research, 82, 353–356.
  23. Parasnis D.S., 1997, Principles of applied geophysics, 5th Edition: Chapman & Hall.
  24. Smettem K.R.J. and Bristow K.L., 1999, Obtaining soil hydraulic properties for water balance and leaching models from survey data. 2. Hydraulic conductivity: Australian Journal of Agricultural Research, 50, 1259–1262.
  25. Smettem, K.R.J., Oliver Y.M., Heng L.K., Bristow K.L. and Ford E.J., 1999, Obtaining soil hydraulic properties for water balance and leaching models from survey data. 1. Water retention: Australian Journal of Agricultural Research, 50, 283–289.
  26. Sparks D.L., 1987, Potassium dynamics in soils: Advances in Soil Science, 6, 1–63.
  27. Tunstall B., 1998, Application of radiometrics to soil survey: some basic considerations: Australian Collaborative Land Evaluation Program Newsletter, 7, 28–31.
  28. Ward S.H., 1981, Gamma-ray spectrometry in geological mapping and uranium exploration: Economic Geology, 75th Anniversary Volume, 840–849.
  29. Wilford J.R., 1995, Airborne gamma-ray spectrometry as a tool for assessing relative landscape activity and weathering development of regolith, including soils: AGSO Research Newsletter, 22, 12–14.
  30. Wilford J.R., Bierwirth P.N. and Craig M.A., 1997, Application of airborne gammaray spectrometry in soil/regolith mapping and applied geomorphology: AGSO Journal of Australian Geology & Geophysics, 17, 201–216.
  31. Wong M.T.F. and Harper R.J. 1999, Use of on-ground gamma-ray spectrometry to measure plant-available potassium and other topsoil attributes: Australian Journal of Soil Research, 37, 267–277.
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  • Article Type: Research Article
Keyword(s): catchment management; gamma radiometrics; high-resolution geophysics; soil mapping; soil properties

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