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Do Soil Surveys and Terrain Analyses Identify Similar Priority Sites for Conservation?

USDA-ARS, National Soil Tilth Lab., 2150 Pammel Dr., Ames, IA 50011

View larger version (69K): [in a new window]   Fig. 1. Maps of the West Nishnabotna and South Fork watersheds, showing the distributions of highly erodible land (HEL) and hydric soils identified from soil survey information. Non-shaded areas are neither hydric nor highly erodible.

View larger version (71K): [in a new window]   Fig. 2. Maps of the West Nishnabotna and South Fork watersheds, showing surrogate delineations for highly erodible land (HEL) based on erosion index (E, defined by Eq. [3]) values, and for hydric soils based on wetness index (W, defined by Eq. [2]) values. These delineations have accuracies ranging from 66 to 74% (see Table 6).

View larger version (32K): [in a new window]   Fig. 3. Plots showing the probability of membership in hydric-soil and highly erodible land (HEL) groupings, as dependent on minimum (or maximum) wetness index (W, defined by Eq. [2]) or erosion index (E, defined by Eq. [3]) values, for the West Nishnabotna and South Fork watersheds. For example, in the plots on the left, the thick curve plots the proportion of cells with greater W values that are mapped as hydric soils, and the thin curve shows the proportion of cells with smaller W values that are mapped as non-hydric soils. Cumulative distributions are shown by the curve marked by open circles to aid interpretation.