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  • compound topographic index and the length–slope factor of the Revised Universal Soil Loss Equation, account for only 3% of the variance in 137Cs activity. In contrast, soil type and land cover in combination (including their interaction) account for 20
  • % of the variance. In areas that received moderate fallout from Chernobyl, soil type alone accounts for a substantial proportion of the spatially correlated 137Cs activity. The AA. attribute this to each soil type having a fairly uniform radiocaesium interception
  • along widely spaced short transects. They describe the sampling, their means of spatial prediction using random forests plus regression kriging (RF + RK) from the sparse data and the non-parametric spatial bootstrap used to estimate the variances from