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• W1550534596 abstract "[1] Most studies of denitrification have focused on organic carbon as an electron donor, but reduced sulfur can also support denitrification. Few studies have reported nitrate (NO3−) reduction coupled with pyrite oxidation and its stoichiometry in surface sediments, especially without experimental pyrite addition. In this study, we evaluated NO3− reduction coupled with sulfur oxidation by long-term incubation of surface sediments from a sulfide-rich ecosystem in Akita Prefecture, Japan. The surface sediments were sampled from a mud pool and a riverbed. Fresh sediments and water were incubated under anoxic conditions (and one oxic condition) at 20°C. NO3− addition increased the SO42− concentration and decreased the NO3− concentration. SO42− production (∆SO42−) was strongly and linearly correlated with NO3− consumption (∆NO3−) during the incubation period (R2 = 0.983, P < 0.01, and n = 8), and the slope of the regression (∆NO3−/∆SO42−) and the stoichiometry indicated sulfur-driven NO3− reduction by indigenous autotrophic denitrifying bacteria. Framboidal pyrite and marcasite (both FeS2) were present in the sediments and functioned as the electron donors for autotrophic denitrification. Both ∆NO3− and ∆SO42− were higher in the riverbed sediment than in the mud pool sediment, likely because of the higher amount of easily oxidizable S (pyrite) in the riverbed sediment. Consistently low ammonium (NH4+) concentrations indicated that NO3− reduction by dissimilatory NO3− reduction to NH4+ was small but could not be disregarded. Our results demonstrate that sulfide-rich ecosystems with easily oxidizable metal-bound sulfides such as FeS2 near the ground surface may act as denitrification hot spots." @default.
• W1550534596 created "2016-06-24" @default.
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• W1550534596 date "2013-05-08" @default.
• W1550534596 modified "2023-10-02" @default.
• W1550534596 title "Nitrate reduction coupled with pyrite oxidation in the surface sediments of a sulfide-rich ecosystem" @default.
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• W1550534596 doi "https://doi.org/10.1002/jgrg.20060" @default.
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