Abstract
Increasing the sulfate concentration and concomitant increases in the organic S concentration failed to exert any effect on organic S mobilization in samples collected from all depths within the mineral soil profile, from 15 sites differing in soil type, vegetation, and geographic location. Mobilization capacities at saturating concentrations of sulfate for organic S formation generally tended to increase with increasing depth. The potentials for the accumulation of organic S with various sulfate inputs exhibited saturation kinetics similar to those observed for organic S formation; values for the former parameter ranged from 3×10-3 to 12.6 μmol S g−1 dry weight 24 h-1 for the uppermost (A, E) soil horizons, 3 nmol to 10 μmol S g-1 dry weight 24 h−1 for intermediate (primarily AB) soil horizons, and from 3 nmol to 13.4 μmol S g-1 dry weight 24 h−1 for the lowermost (B, C) soil horizons. Irrespective of depth, the Fullerton, Tarklin, and Loblolly sites in Tennessee and the Florida site showed the least net accumulation of organic S at saturation ( 1.0 μmol S g-1 dry weight 24 h-1 for most horizons examined).
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