Abstract
In many aquatic sediments significant dissimilatory microbial iron
reduction has been observed in the deep methanogenic zone, sometimes
accompanied by methane decrease. Our recent lake sediment results from
sedimentary profiles combined with slurry incubations indicate that this
reduction of iron is coupled to anaerobic oxidation of methane (AOM).
The process was found to involve both methanogens and (aerobic)
methanotrophs. It seems that the methanogens are involved in reducing
the iron and producing some intermediates, but do not incorporate
methane as carbon source. The methanotrophs, on the other hand,
assimilate and oxidize the methane. New sets of geochemical experiments
test the potential role of aerobic methanotrophy in the iron-coupled AOM
process using inhibitors for their activity and addition of oxygen.
These experiments provide insight into the methane oxidation mechanism
of the methanotrophs.
Original language | English |
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Title of host publication | EGU General Assembly, EGU2019, Proceedings from the conference held 7-12 April, 2019 in Vienna, Austria |
Volume | 21 |
State | Published - 1 Apr 2019 |