期刊
ESTUARINE COASTAL AND SHELF SCIENCE
卷 89, 期 4, 页码 256-266出版社
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ecss.2010.07.013
关键词
methane; chamber flux measurements; coastal environment; Arcachon Lagoon
资金
- French National Programme on Coastal Environment (PNEC Chantier Littoral Atlantique)
- ANR
The Arcachon lagoon is a 156 km(2) temperate mesotidal lagoon dominated by tidal flats (66% of the surface area). The methane (CH4) sources, sinks and fluxes were estimated from water and pore water concentrations, from chamber flux measurements at the sediment air (low tide), sediment-water and water-air (high tide) interfaces, and from potential oxidation and production rate measurements in sediments. CH4 concentrations in waters were maximal (500-1000 nmol l(-1)) in river waters and in tidal creeks at low tide, and minimal in the lagoon at high tide (<50 nmol l(-1)). The major CH4 sources are continental waters and the tidal pumping of sediment pore waters at low tide. Methanogenesis occurred in the tidal flat sediments, in which pore water concentrations were relatively high (2.5-8.0 mu mol l(-1)) Nevertheless, the sediment was a minor CH4 source for the water column and the atmosphere because of a high degree of anaerobic and aerobic CH4 oxidation in sediments. Atmospheric CH4 fluxes at high and low tide were low compared to freshwater wetlands. Temperate tidal lagoons appear to be very minor contributor of CH4 to global atmosphere and to open ocean. (C) 2010 Elsevier Ltd. All rights reserved.
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