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Fig. 3. Integration of field, inventory, and remote sensing data used in the development of this C accounting framework. The (a) National Land Cover Data (NLCD) land use classes, (b) State Soil Geographic database (STATSGO) map units, and (c) county Federal Information Program Service values were integrated into (d) one composite layer that summarizes the unique combinations of the three values. Annual adoption rates (e) of different tillage intensities (from Conservation Technology Information Center [CTIC] data) were applied to the area of respective crop types (from National Agricultural Statistics Service [NASS] data). The new data set was combined with C dynamics derived from field experiments (f) using initial soil C values (b) to estimate changes in soil C that were then distributed across areas of respective cropland classes in the NLCD (a). A final spatial data set (g) of estimated C flux was generated.
