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Regional and Catenary Variations in Properties of Borolls of Southern Saskatchewan, Canada

Dep. of Soil Science, Univ. of Saskatchewan, Saskatoon, SK, Canada S7N 0W0)

*Corresponding author.

ABSTRACT

The spatial pattern of soil properties results from systematic variations in the type and intensity of soil-forming processes and from random variations superimposed on the systematic variations. We examined the thickness of A horizons and depths to CaCO₃ at 21 sites in southern Saskatchewan to determine whether systematic differences occurred among soil-moisture regimes of Borolls and among landform elements in catenas. The mean thickness of A horizons was thinnest for the aridic Borolls ( = 15.3 cm) and ustic Borolls ( = 15.2 cm) and thickest in the udic Borolls ( = 18.4 cm), reflecting the regional moisture gradient. The regional differences in mean depth to CaCO₃ were contrary to the expected pattern: mean depths were smallest for the ustic Borolls ( = 29.9 cm) and greatest for the aridic ( = 34.1 cm) and the udic ( = 34.9 cm) Borolls. A consistent pattern was associated with landform elements in soil catenas. The smallest means for both properties were associated with shoulder and backslope elements with convex across-slope curvatures, and the greatest means for footslope elements with concave across-slope curvatures. The range in mean values of the two properties among landform elements within a catena was consistently an order of magnitude greater than the regional differences among soil subgroups.

Contribution no. R645 of the Saskatchewan Inst. of Pedology.

Received for publication June 14, 1989.

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