Sulfur transformations and pool sizes in tropical forest soils
1991
Stanko-Golden, K.M. | Fitzgerald, J.W.
Samples of A horizon soils collected along an elevational gradient within the Luquillo Experimental Forest in Puerto Rico, were examined for their capacity to adsorb sulfate, form organic S, and mobilize organic S that had been recently formed. Soil moisture, carbon, pH, and S pool sizes were assayed to determine factors regulating these processes. Samples were found to adsorb between 1.6 and 5.7 nmol S g-1 dry wt of added sulfate, while organic S formation potentials ranged from 0.7 to 3.6 nmol S g-1 dry wt. All soils within the gradient exhibited the capacity to mobilize organic S (between 27.3 and 56.9% 24 h-1) as well as the capacity to accumulate organically bound S (0.7-1.8 nmol S g-1 24 h-1). Total S ranged from 1231 to 353 microgram S g-1 dry wt and organic S was the most abundant constituent. Carbon and moisture content were positively correlated with organic S formation potentials (r = 0.71; P less than or equal to 0.001;r = 0.80;P less than or equal to 0.001; respectively), while total amounts of sulfate were positively correlated with organic S mobilization rates (r = 0.85;P less than or equal to 0.004).
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