Soil-landscape Relationships in the Occidental Plateau of São Paulo State, Brazil: I. Geomorphic Surfaces and Soil Mapping Units
1977
Lepsch, I. F. | Buol, S. W. | Daniels, R. B.
This study was conducted in a 70.8 km² area that includes most of the soils and landscapes present in the Occidental Plateau region of São Paulo State, Brazil. Surficial deposits of unknown derivation and age and Cretaceous age carbonate cemented sandstone are the soil parent materials. Both geomorphic surfaces and soils were mapped. Surface and subsurface soil chemical and physical characteristics of 103 sites were summarized to evaluate the soil variation of geomorphic surfaces and soil mapping units. Soil properties that are expressions of weathering indices are related to geomorphic surface, but clay illuviation, base saturation, and carbon content do not regularly increase or decrease from the oldest to the youngest surface. More than one soil mapping unit can be found on one geomorphic surface. Most soil physical and chemical properties have smaller coefficients of variation when grouped by soil mapping unit than when grouped by geomorphic surface.
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