Methane and nitrous oxide fluxes in two coastal wetlands in the northeastern Gulf of Bothnia, Baltic Sea

Fluxes of CH4 and N2O were measured in wetlands in Liminganlahti (Baltic Sea) in the vicinity of the estuaries of the Lumijoki and Temmesjoki. Wetlands were significant sources of CH4, with a mean flux of 206 mg m–2 d–1. Methane fluxes correlated positively with temperature and were slightly higher...

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Bibliographic Details
Published in:Boreal environment research 2009, Vol.14 (3), p.351
Main Authors: Liikanen, A, Silvennoinen, H, Karvo, A, Rantakokko, P, Martikainen, P J
Format: Article
Language:English
Online Access:Get full text
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Summary:Fluxes of CH4 and N2O were measured in wetlands in Liminganlahti (Baltic Sea) in the vicinity of the estuaries of the Lumijoki and Temmesjoki. Wetlands were significant sources of CH4, with a mean flux of 206 mg m–2 d–1. Methane fluxes correlated positively with temperature and were slightly higher from the wetland of the Lumijoki, where water SO42– concentrations were lower. On average, the wetland close to the Temmesjoki was a small source of N2O (mean flux of 131 µg m–2 d–1), whereas the wetland close to the Lumijoki was a small sink for N2O (mean flux of –53 µg m–2 d–1). The higher availability of nitrogen in the wetland near the Temmesjoki obviously induced the higher N2O fluxes. Estuarine wetlands seem to be important sources of atmospheric CH4 but do not represent an important source of N2O although increased N loading.
ISSN:1239-6095
1797-2469