Environmental Geochemistry and Health

, Volume 25, Issue 1, pp 17–24

Soil Ingestion By Sheep Grazing the Metal Enriched Floodplain Soils of Mid-Wales

  • Peter W. Abrahams
  • Jörg Steigmajer


Floodplain soils within and downstream from the mineralised and mined areas of mid-Wales, are contaminated by metals, especially Pb, because of historical and contemporary fluvial pollution. Rates of soil ingestion by sheep grazing these sites have been quantified to establish the relative importance of the soil-plant-animal and soil-animal pathway of metals. The highest rates of soil ingestion occurred during the winter/spring period. During March, soil ingestion exceeded 30% of the D.M. intake at 2 of the 11 sites investigated. The total daily intake of metals by sheep reflects the degree of soil metal enrichment, and is elevated during the winter/spring period, coincident with the higher rates of soil ingestion and the generally higher pasture herbage metal concentrations. Because the soil-plant transfer of Pb is low, ingested soil is often the major pathway of this metal to sheep. This is especially evident in March and May when on average 80.0 and 82.9%, respectively of the Pb intake was via soil ingestion. At one site in May, 97% of the Pb intake was attributable to ingested soil. Even when soil-plant transfers are not so low, as found for Cu and Zn, ingested soil can occasionally supply greater than 60% of these metals to the animal. However, despite the potential importance of soil ingestion, little is known about the availability to and absorption of soil-borne metals by animals.

floodplain lead metals soil contamination soil ingestion Wales 


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  1. Abrahams, P.W.: 1983, Distribution, Dispersion and Agricultural Significance of Metals in Soils of the Mining Regions of Southwest England, PhD Thesis, University of London.Google Scholar
  2. Abrahams, P.W. and Thornton, I.: 1994, The contamination of agricultural land in the metalliferous province of southwest England: implications to livestock, Agriculture, Ecosystems and Environment 48, 125-137.Google Scholar
  3. Alloway, B.J. and Davies, B.E.: 1971a, Trace-element content of soils affected by base metal mining in Wales, Geoderma 5, 197-208.Google Scholar
  4. Alloway, B.J. and Davies, B.E.: 1971b, Heavy metal content of plants growing on soils contaminated by lead mining, Journal of Agricultural Science, Cambridge 76, 321-323.Google Scholar
  5. Davies, B.E. and Lewin, J.: 1974, Chronosequences in alluvial soils with special reference to historic lead pollution in Cardiganshire, Wales, Environmental Pollution 6, 49-57.Google Scholar
  6. Field, A.C. and Purves, D.: 1964, The intake of soil by the grazing sheep, Proceedings of the Nutrition Society 23, 24-25.Google Scholar
  7. Green, N., Johnson, D. and Wilkins, B.T.: 1996, Factors affecting the transfer of radionuclides to sheep grazing on pastures reclaimed from the sea, Journal of Environmental Radioactivity 30, 173-183.Google Scholar
  8. Griffith, J.J.: 1918, Influence of mines upon land and livestock in Cardiganshire, Journal of Agricultural Science, Cambridge 9, 366-395.Google Scholar
  9. Healy, W.B.: 1967, Ingestion of soil by sheep, Proceedings of the New Zealand Society of Animal Production 27, 109-120.Google Scholar
  10. Healy, W.B.: 1973, Nutritional aspects of soil ingestion by grazing animals, in: Butler, G.W. and Bailey, R.W. (eds), Chemistry and Biochemistry of Herbage, Vol. 1, Academic Press, London, pp. 567-588.Google Scholar
  11. ICRCL: 1990, Notes on the Restoration and Aftercare of Metalliferous Mining Sites for Pasture and Grazing, ICRCL 70/90, Interdepartmental Committee on the Redevelopment of Contaminated Land, DOE, London, p. 14.Google Scholar
  12. Lewin, J., Bradley, S.B. and Macklin, M.G.: 1983, Historical valley alluviation in mid-Wales, Geological Journal 18, 331-350.Google Scholar
  13. Lewin, J. and Macklin, M.G.: 1987, Metal mining and floodplain sedimentation in Britain, in: Gardiner, V. (ed.), International Geomorphology 1986 Part 1, Wiley, Chichester, pp. 1009-1027.Google Scholar
  14. McDonald, P., Edwards, R.A., Greenhalgh, J.F.D. and Morgan, C.A.: 1995, Animal Nutrition, Longman, Harlow, 607 pp.Google Scholar
  15. Thompson, M. and Wood, S.J.: 1982, Atomic absorption methods in applied geochemistry, in: Cantle, J.E. (ed.), Atomic Absorption Spectrometry, Elsevier, Amsterdam, pp. 261-284.Google Scholar
  16. Thornton, I.: 1983, Geochemistry applied to agriculture, in: Thornton, I. (ed.), Applied Environmental Geochemistry, Academic Press, London, pp. 231-266.Google Scholar
  17. Ure, A.M. and Berrow, M.L.: 1970, Analysis of EDTA extracts of soils for copper, zinc, and manganese by atomic absorption spectrophotometry with a mechanically separated flame, Analytica Chimica Acta 52, 247-257.Google Scholar

Copyright information

© Kluwer Academic Publishers 2003

Authors and Affiliations

  • Peter W. Abrahams
    • 1
  • Jörg Steigmajer
    • 1
  1. 1.Institute of Geography and Earth SciencesUniversity of WalesAberystwythUK

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