Abstract
Sulfate reduction rates of the sedkment at the depth of 0-5cm were measured for 15 month from September, 1984 to November 1985 in eutrophicated blackish Lake Nakanoumi, Japan.The sulfate reduction rates were usually high at the surface sediment and decreased with increased depth. The average sulfate reduction rate of the sediment (0-3cm) at the central position (St.4) and heavily ponuted area Yonago Bay (St.11) was 53.8±25.0 and 104.4±72.1 nmol day-1 ml-1, annual estimated decomposition rate of organic matter was 14.2 and 27.4 g-cm-2, respectively.
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