Soil depth-age relationship of landslides on deforested slopes, Taranaki, New Zealand
1988
Trustrum, N.A. | De Rose, R.C.
A soil chronosequence was examined on landslide scars of different ages in the Taranaki Hill country. This area, underlain by Tertiary silty sandstone, was deforested 90 years ago. Sequential aerial photographs, historical terrestrial photographs and documented erosion events were used to date landslide scars formed since forest removal and establish age control for the chronosequence. Soil depth increased with landslide age and was used as an index for soil formation. Mean soil depth increased from 5 cm on 15-year old scars to 20 cm on 82-year old scars. Measured soil depths were attributed to rafted soil, colluvium and bedrock weathering. A chronofunction was derived by regressing mean soil depth against the logarithm of known scar age. Similarly, a second chronofunction was derived excluding depths of rafted soil from the calculation of mean soil depth to describe soil accumulation on exposed bedrock within the landslide scar.
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