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Soil Science Dep. Univ. of Florida, Gainesville, FL 32611-0290
*Corresponding author.
ABSTRACT
Spodosols are widely distributed in Florida and occupy about 27% of the state's land area. Our objective was to estimate total organic carbon (OC) in the 3.66 x 106 ha of Spodosols in Florida, and to partition that OC by horizon (Bh vs. other components) and by depth (above and below 1 m). Data employed were: (i) areas of the 61 Spodosol series mapped in the 48 (of 67) Florida counties having soil survey reports published since 1960, and (ii) profile descriptions and soil characterization data for horizons from 244 Spodosol pedons representing 55 series. Individual profile data were averaged by three different procedures: (i) gross averages of all profiles and for Humods and Aquods separately, (ii) averages of suborder means weighted by respective total areas of each, and (iii) averages of series means weighted by areas of series-named map units in the 48 mapped counties. Organic C concentrations (mean ± SD) in A, E, Bh, and B'h horizons were 19 ± 20, 1.9 ± 2.1, 17 ± 12, and 8.5 ± 5.0 g kg–1. Gross OC densities (mean ± SE) of profiles to 1 m and the complete sampled profiles were 10.4 ± 0.8 and 18.3 ± 0.8 kg m–2. About one-half of the latter was in the combined Bh + B'h horizons. Weighting by suborder and series areas increased these numbers slightly. Aquods had significantly higher OC densities than Humods in all depths. Estimated series-weighted total OC in Florida Spodosols is 809 Tg, of which 431 Tg resides in Bh + B'h horizons.
Florida Agric. Exp. Stn. Journal Series no. R-02384.
Received for publication May 7, 1992.
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