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Spatial and Spectral Relationships of Soil Properties and Microtopography: II. Density and Thickness of B Horizon¹

ABSTRACT

The effects of microtopography (<50 m) and an intertill stratigraphic sand-gravel layer on the spatial variability of B horizon thickness, density, and mass are examined using standard, spatial, and spectral statistical methods. The relationships between A and B horizon thickness, density, and mass are also examined. Elevation and maximum surface gradient were significantly correlated to B horizon density. Microtopography parameters were not correlated to B horizon thickness or mass. The B horizon thickness and mass were significantly correlated to the depth to the intertill sand-gravel layer. Significant autocorrelation was present in the density of the B horizon but not the A horizon. B horizon thickness and mass cycled significantly but at different frequencies than the A horizon. Spatial variability of the B horizon soil properties was related to the depth of the intertill sand-gravel layer while the variability of the A horizon was related in large part to microtopography, especially curvature. Coherency and cospectral analysis indicated the B horizon mass had some relationship to surface curvature, but opposite correlation existed over different frequency ranges resulting in a non-significant overall correlation. Average thickness, density, and mass of the solum did not have similar significant cycling or autocorrelation as was present in the individual horizons.

¹ Contribution from the Dep. of Land, Air, and Water Resources, Univ. of California, Davis, and the Saskatchewan Institute of Pedology Publication no. R425, Saskatoon, Sask., Canada.

² Research Associate and Professor, respectively, Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, Canada S7N 0W0

³ Professor, Dep. of Land, Air, and Water Resources, Univ. of California, Davis.

Received for publication March 16, 1984. Accepted for publication January 21, 1985.

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