Spatial and Spectral Relationships of Soil Properties and Microtopography: II. Density and Thickness of B Horizon1
- R. G. Kachanoski,
- E. De Jong2 and
- D. E. Rolston3
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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