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Humic acid addition lowers methane release in peats of the Mer Bleue bog, Canada

Author:
Blodau, Christian, Deppe, Marianna
Source:
Soil biology & biochemistry 2012 v.52 pp. 96-98
ISSN:
0038-0717
Subject:
bogs, carbon dioxide, electrons, humic acids, methane, methane production, oxidation, peat, peatlands, Canada
Abstract:
The effects of humic substances on methanogenesis in peats are poorly understood. In incubation experiments we added Pahokee Peat Humic Acid (DOM), a suppressor for methanogenesis (2-bromoethane sulfonic acid, BES), and BES + DOM to bog peat and studied CO₂ and CH₄ release. Addition of DOM lowered CH₄ (p < 0.05) but not CO₂ release compared to controls. BES addition suppressed CH₄ release compared to controls (p < 0.01). DOM/BES addition lowered the release even further (p = 0.06) but did not induce net CH₄ loss. DOM was thus utilized as electron acceptor and lowered CH₄ release; anaerobic CH₄ oxidation may have contributed to this effect.
Agid:
514668