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This article in SSSAJ

  1. Vol. 49 No. 4, p. 812-816
     
    Received: Mar 16, 1984
    Published: July, 1985


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doi:10.2136/sssaj1985.03615995004900040004x

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

  1. R. G. Kachanoski,
  2. E. De Jong2 and
  3. D. E. Rolston3

Abstract

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.

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