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In conjunction with geochemical characteristics, rate of sulfate reduction was investigated at two sediment sites in the continental slope and rise (basin) of the Ulleung Basin in the East Sea. Geochemical sediment analysis revealed that the surface sediments of the basin site (D2) were enriched with manganese oxides (348 μ㏖ ㎝?³) and iron oxides (133 μ㏖ ㎝?³), whereas total reduced sulfur (TRS) in the solid phase was nearly depleted. Sulfate reduction rates (SRRs) ranged from 20.96 to 92.87 n㏖ ㎝?³ d?¹ at the slope site (M1) and from 0.65 to 22.32 n㏖ ㎝?³ d?¹ at the basin site (D2). Depth integrated SRR within the top 10 ㎝ depth of the slope site (M1; 5.25 m㏖ m?² d?¹) was approximately 6 times higher than that at the basin site (D2; 0.94 m㏖ m?² d?¹) despite high organic content (2.0% dry wt.) in the sediment of both sites. The results indicate that the spatial variations of sulfate reduction are affected by the distribution of manganese oxide and iron oxide-enriched surface sediment of the Ulleung Basin.

ocean and polar research/ocean and polar research

Comparison of Sulfate Reduction Rates Associated with Geochemical Characteristics at the Continental Slope and Basin Sediments in the Ulleung Basin, East Sea