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The nature and distribution of forms of sulfur within the soil profile was studied in a climo-toposequence of soils from Saskatchewan. Total and soluble (CaCl 2 -extractable) inorganic SO 4 = generally increased with horizon depth. Calcium carbonate-associated SO 4 = accounted for up to 42% of subsoil S. Organic S decreased significantly with depth, as did the proportion of organic S occurring as organic SO 4 =. Amounts of total S, in surface and subsurface horizons generally increased from upper to lower slope positions. Organic SO 4 = in the surface horizons, as a proportion of the total S, decreased from upper to lower slope positions and across a narrow environmental gradient going from the arid Brown Chernozemic soils in the southwest to the more humid Gray Luvisols in the northeast. Key words: Total S, organic SO 4 =, CaCl 2 -extractable SO 4 =, HCl-extractable SO 4 =, profile distribution

THE INFLUENCE OF TOPOGRAPHY ON THE NATURE AND DISTRIBUTION OF SOIL SULFUR ACROSS A NARROW ENVIRONMENTAL GRADIENT