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29 Jan 2014
Status : this preprint was under review for the journal BG but the revision was not accepted.
Mechanisms for the suppression of methane production in peatland soils by a humic substance analog
R. Ye , J. K. Keller , Q. Jin , B. J. M. Bohannan , and S. D. Bridgham
Methane (CH4 ) production is often impeded in many northern peatland soils, although inorganic terminal electron acceptors (TEAs) are usually present in low concentrations in these soils. Recent studies suggest that humic substances in wetland soils can be utilized as organic TEAs for anaerobic respiration and may directly inhibit CH4 production. Here we utilize the humic analog anthraquinone-2, 6-disulfonate (AQDS) to explore the importance of humic substances, and their effects on the temperature sensitivity of anaerobic decomposition, in two peatland soils. In a bog peat, AQDS was not instantly utilized as a TEA, but greatly inhibited the fermentative production of acetate, carbon dioxide (CO2 ), and hydrogen (H2 ), as well as CH4 production. When added together with glucose, AQDS was partially reduced after a lag period of 5 to 10 days. In contrast, no inhibitory effect of AQDS on fermentation was found in a fen peat and AQDS was readily reduced as an organic TEA. The addition of glucose and AQDS to both bog and fen peats caused complicated temporal dynamics in the temperature sensitivity of CH4 production, reflecting temporal changes in the temperature responses of other carbon processes with effects on methanogenesis. Our results show that the humic analog AQDS can act both as an inhibitory agent and a TEA in peatland soils. The high concentrations of humic substances in northern peatlands may greatly influence the effect of climate change on soil carbon cycling in these ecosystems.
Received: 18 Dec 2013 – Discussion started: 29 Jan 2014
R. Ye , J. K. Keller , Q. Jin , B. J. M. Bohannan , and S. D. Bridgham
Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
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Status: closed
Status: closed
AC : Author comment | RC : Referee comment | SC : Short comment | EC : Editor comment
- Printer-friendly version
- Supplement
R. Ye , J. K. Keller , Q. Jin , B. J. M. Bohannan , and S. D. Bridgham
R. Ye , J. K. Keller , Q. Jin , B. J. M. Bohannan , and S. D. Bridgham
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