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Spatial Variation of Sand Content and pH Within Single Contiguous Delineations of Two Soil Mapping Units¹

ABSTRACT

Quantitative estimates were made of the rates of spatial variation of soil properties within each of two sampled areas displaying contrasting patterns of variation. Samples were collected at 10-m intervals on two sampling grids, each 8 by 20, positioned on contiguous delineations of the Ladysmith and Pawnee series in eastern Kansas. The Pawnee is developed from glacial till, the Ladysmith from fine-textured sediments.

Spatial variation of sand and pH measurements within both of the sampled areas was studied using the semivariance, a statistical function tailored for the analysis of continuous geographic variables. There is a contrast in spatial variation of sand content within the two areas; in the Ladysmith area, a distance of 30 m is sufficient to encounter full variation of sand content, but in the Pawnee area, a distance of 40 m is required. pH has random variation within both areas. This information can be used to select optimum spacing of samples in designing soil sampling plans.

¹ Contribution of the Kansas Geological Surgey, and the Dep. of Geography-Meteorology, the Univ. of Kansas, Lawrence, KA 66045. Presented before Div. S-5, Soil Sci. Soc. Am., Houston, Texas, 30 Nov. 1976.

² Presently Assistant Professor, Department of Geography, Virginia Polytechnic Inst. and State Univ., Blacksburg, VA 24061

Received for publication March 28, 1977. Accepted for publication January 19, 1978.

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