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Edaphic Controls on Soil Organic Carbon Retention in the Brazilian Cerrado: Texture and Mineralogy

^a School of Natural Resources, Ohio State Univ., 2021 Coffey Rd., Columbus, OH 43210-1085
^b Embrapa Cerrados Agric. Research Center, P.O. Box 08223, 73310-970 Planaltina-DF, Brazil

View larger version (24K): [in this window] [in a new window]   Fig. 1. Graphical view of the soil organic C (SOC) dilution effect for the sand, silt, and clay fractions (in the regression equations, y and x correspond to values on y and x axes).

View larger version (29K): [in this window] [in a new window]   Fig. 2. Soil organic C (SOC) size pools (mean of three replicates) for three selected depths in (a) relative and (b) absolute units, representing total SOC partitioning throughout particle size fractions. Bars represent standard error.

View larger version (26K): [in this window] [in a new window]   Fig. 3. (a) Clay-sized soil organic C (SOC) pool as a function of clay content throughout the profiles; (b) plot of intercepts and slopes [from linear relations in (a)] vs. depth; and (c) plot of estimated vs. measured clay-sized SOC pool (dotted lines mark the 95% confidence interval).

View larger version (23K): [in this window] [in a new window]   Fig. 4. a) Linear relations between Brunauer–Emmet–Teller N2 specific surface area (SSA) and clay content (n = 9); (b) linear relations between soil organic C (SOC) concentrations and SSA n = 9); and (c) fit of the model of SSA as a function of clay, silt, and SOC contents (n = 27, dotted lines mark the 95% confidence interval).

View larger version (25K): [in this window] [in a new window]   Fig. 5. Linear relations (n = 9) between concentrations of total soil organic C (SOC) and clay-sized crystalline Fe oxides (cryst. Fe2O3) and amorphous Fe and Al oxides (Fe2O3- and Al2O3-oxal.) at three selected depths.