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The Nature and Forms of Sulfur in Organic Matter Fractions of Soils Selected Along an Environmental Gradient¹

ABSTRACT

The role of S in humus formation and transformation was hypothesized on the basis of C/N/S ratio and percent HI-reducible S determinations on organic fractions obtained from soil Ap horizons by a 0.1M NaOH – 0.1M Na₄P₂O₇ (pH 13.0) extraction-separation technique. Differences in C/N/S ratios of the conventional humic acid (HA-A) fractions were greater (from 113:10.6:1 to 270:23.3:1) than those of the total soil organic matter (61:6.5:1 to 112:9.7:1) in soils along an environmental gradient delineated by semiarid Chernozemic Brown to sumhumid Luvisolic Gray soils. This fraction (HA-A) is thought to represent the end product of the humification process. Differences in C/N/S ratios of conventional fulvic acid (FA-A), clay associated humic acid (HA-B) and <2 µm humin were smaller than for HA-A along the gradient. On the basis of C/N/S ratios and the average percentage of HI-reducible S in each fraction, e.g. HA-A, 26%; HA-B, 44%; FA-A, 82%; and <2 µm humin, 52%; it was postulated that FA-A, HA-B, and <2 µm humin contained the majority of potentially labile S.

¹ Journal paper no. R225 of the Saskatchewan Institute of Pedology, Saskatoon, Saskatchewan. Research supported by the National Research Council of Canada, Grant no. A4474, the Sulphur Development Inst. of Canada (SUDIC), and the Canadian Commonwealth Scholarship and Fellowship Committee.

² Associate Professor, Professor of Soil Science, and Research Assistant, respectively, Univ. of Saskatchewan, Saskatoon, Canada S7N 0W0.

Received for publication December 26, 1978. Accepted for publication April 13, 1979.

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