Soil transect correlograms of North Oxfordshire and their interpretation

A - Papers appearing in refereed journals

Webster, R. and Cuanalo, De La C, H. E. 1975. Soil transect correlograms of North Oxfordshire and their interpretation. Journal of Soil Science. 26 (2), pp. 176-194.

AuthorsWebster, R. and Cuanalo, De La C, H. E.

Summary In almost all soil surveys some attempt is made in the early stages to assess the scale on which the soil changes, and the information required is often obtained from transects. By recording soil properties at a constant close spacing on such transects methods of analysis, especially those devised for time series, data can be applied to reveal patterns of variation, and hence lead to rational mapping strategy. Correlograms, which show on average the relation of soil at one point to that at another, seem especially promising. The potential of time series analysis in soil survey was explored by measuring soil properties in three horizons in profiles at 10 m intervals along a transect across the Lower Jurassic outcrop in north Oxfordshire. Correlograms were computed for clay, silt, pH, CaCO3, colour value, and stoniness in each horizon. They showed that, for all the properties, the relation between sampling points weakened steadily over distances from 10 m to about 230 m. The average spacing between geological boundaries on the transect was also about 230 m, and outcrop lithology was inferred as one of the main sources of soil variation. The effect of rock type was eliminated by computing deviations of the original values from the means of the outcrops in which they occurred. Correlograms of these showed almost no relation between points more than 10 m apart; i.e. the only other major source of variation occurred within 10 m. In this instance mappable soil boundaries are likely to occur on average every 230 m, and sampling at a spacing closer than I15 m would be needed to detect them from profile inspection alone. Alternatively a map of the geological boundaries with descriptions of the soil for each map unit would constitute almost the best soil map that could be achieved in this area.

Year of Publication1975
JournalJournal of Soil Science
Journal citation26 (2), pp. 176-194
Digital Object Identifier (DOI)
Open accessPublished as non-open access
British Society of Soil Science (BSSS)

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