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Journal Article

Methane turnover in exposed sediments of an Amazon floodplain lake.


Koschorreck,  Matthias
Working Group Tropical Ecology, Max Planck Institute for Limnology, Max Planck Institute for Evolutionary Biology, Max Planck Society;

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Koschorreck, M. (2000). Methane turnover in exposed sediments of an Amazon floodplain lake. Biogeochemistry, 50(2), 195-206.

Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-DF6C-3
In the Amazon floodplain large areas of unvegetated lake sediments are exposed to air during low water. I measured methane fluxes from exposed sediments of an Amazonian floodplain lake and assessed the regulating factors. Methane emission decreased from values between 10 and 40 μmol CH₄m⁻²h⁻¹ to zero when the sediments were exposed to air. Mean fluxes were about 3.7 μmol CH₄m⁻²h⁻¹. Fluxes were low compared to measurements taken from flooded habitats making exposed lake sediments a negligible source of atmospheric CH₄. This was mainly due to the lack of ebullition which governs methane flux in the flooded phase. Methane oxidation at the sediment surface consumed up to 75% of the methane entering the oxidised zone. Compared with CO₂ emission methane turnover was of minor importance for the carbon budget of the sediments.