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Charcoal Carbon in U.S. Agricultural Soils

^a CSIRO Land and Water and CRC for Greenhouse Accounting, Private Bag No. 2, Glen Osmond, SA, Australia 5064
^b USDA-ARS, North Central Soil Conservation Research Lab, 803 Iowa Ave., Morris, MN 56267

View larger version (32K): [in a new window]   Fig. 1. Nuclear magnetic resonance spectra of the five soils before fractionation and after photo-oxidation of the <53-µm fractions.

View larger version (19K): [in a new window]   Fig. 2. The relative proportions of C in six functional regions, expressed in grams of C per 100 grams of total organic C (TOC), in the original soil (black), and in the <53-µm fractions (hatched) after photo-oxidation as determined by solid-state 13C cross-polarization magic-angle spin nuclear magnectic resonance (CPMAS NMR) spectroscopy.

View larger version (83K): [in a new window]   Fig. 3. Scanning electron microscopy photos: (a) Elliott silt loam and (b) Vallers silty clay loam of <53-µm fractions following photo-oxidation and HF treatment. Blocky, plant-like particles with fractured edges are characteristics of finely divided soil charcoal fragments.