For this study, a model framework was used to understand the spatial
distribution of soil and SOC caused bywater and tillage erosion. This
model framework consisted of two models: USPED and TEP. Themodels
required different information including precipitation, soil, topography,
land use and land cover, andmanagement, which was collected in a related
study by Schumacher et al. (2005). In this study, the DEMcell size
was evaluated in two field sites (field sites 1 and 2). Based on these results,
the best fitwas selected to calibrate the topographic parameters in
field site 1. The simulated estimates of soil redistribution (erosion and
deposition) rates for each of the possible combinations of the calibrated
parameters were compared with those derived from 137Cs measurements
by Ritchie et al. (2007) and used by Schumacher et al. (2005).
The topographic parameters with the best fit in field site 1 were used
in field site 2 to validate the model framework. The results from each
site were then used to estimate SOC redistribution.