A simple model was developed to evaluate the impacts of long-term soil erosion on pasture productivity caused by storm-induced landslides steep (>25��) hill slopes. The study area is located on the North Island of New Zealand (38�� 24� S; 175�� 43� E) where the risk of landslides can increase following initial forest or scrub clearance, ultimately leading to a decrease in pasture productivity caused by increased soil erosion. The basic modeling unit of measurement used was the terrain mapping unit (TMU) which is described as a relatively homogenous parcel of land covering several hectares up to several thousand hectares. Several variables were included in this model (surface and subsurface soil properties within the TMU, landslide occurrences, intensity of rainfall events, natural terrain controls and productivity).
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