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• W2037582162 startingPage "2637" @default.
• W2037582162 abstract "The objectives of this study were to partition out the predominant anaerobic respiration pathways coupled to C oxidation and to further elucidate the controls of anaerobic C respiration in three major saltmarsh habitats at Skidaway Island, GA; the short form of Spartina alterniflora (SS), the tall form of S. alterniflora (TS), and unvegetated, bioturbated creekbank (CB). Geochemical analysis of pore water and solid phase constituents revealed that the SS site experienced highly reducing conditions with two orders of magnitude higher pore water sulfide inventories (1.884 mmol m−2) than TS (0.003 mmol m−2) and CB (0.005 mmol m−2), respectively. Conversely, reactive Fe(III) inventories at TS (2208 mmol m−2) and CB (2881 mmol m−2) were up to 7–9 times higher than at SS (338 mmol m−2). Incubations and intact core experiments indicated that SO42- reduction accounted for 95% (SS), 37% (TS) and 66% (CB) of total anaerobic respiration. There was no detectable Fe(III) reduction at SS, while Fe(III) reduction accounted for up to 70% of C oxidation in the 3–6 cm depth interval at TS and 0–3 cm depth of CB, and on average, approximately 55% of C oxidation over two-thirds of marsh surface area. Laboratory manipulations provided further evidence for the importance of Fe(III) reduction as the accumulation rates of fermentation products were high when Fe(III) reduction was inhibited by removing the Fe(III) minerals from highly bioturbated CB sediments with higher Fe(III) mineral contents. Anaerobic C oxidation, SO42-- and Fe(III)-reduction rates appeared to be highest at the TS site during active plant growth in summer. Overall results suggest that bioturbation by macrofauna is the overriding factor in modulating the pathway of C mineralization in the saltmarsh, whereas availability of organic substrates from plants is a key factor in controlling the C oxidation rate." @default.
• W2037582162 created "2016-06-24" @default.
• W2037582162 creator A5022487559 @default.
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• W2037582162 date "2007-12-01" @default.
• W2037582162 modified "2023-10-18" @default.
• W2037582162 title "Relative contributions of sulfate- and iron(III) reduction to organic matter mineralization and process controls in contrasting habitats of the Georgia saltmarsh" @default.
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• W2037582162 doi "https://doi.org/10.1016/j.apgeochem.2007.06.005" @default.
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