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Journal Article

Methane turnover in exposed sediments of an Amazon floodplain lake.

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http://pubman.mpdl.mpg.de/cone/persons/resource/persons56776

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
Abstract
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.