In this area, soil heterogeneity at a broad scale is less pronounced than the variety of landscapes encountered might imply. We attribute this to the relatively young soil age: while the parent materials come from geological formations more than 5 million years old, soil profile development is theorised to be constrained by high rates of downslope creep, high relief, and moderately high rainfall with strong seasonal variability.
Soil heterogeneity was most apparent over short distances and is theorised to be driven largely by surface water behaviour, degree of erosion, and degree of exposure to prevailing weather. Soil horizonation is inherently unpredictable in areas that have slipped, but A horizon re-establishment was observed on most slips.
Field pH testing indicated naturally acidic conditions throughout soil profiles in many parts of the study area (pH 5.0 - 6.0). Only one alkaline soil profile was encountered, with significant secondary carbonate throughout. These soils may occur rarely within the study area, associated with limestone outcrops, but are too uncommon and spatially restricted to be mapped at the target scale.