Author: Haley Alcock
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Size: 49.24 MB
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Languages : en
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by Haley Alcock, release date 2020, Methane Flux From A Cool Temperate Freshwater Marsh Books available in PDF, EPUB, Mobi Format. Download
Methane Flux From A Cool Temperate Freshwater Marsh books, "Temperate freshwater marshes have been shown to be large sources of methane, contributing to wetlands being the largest natural source of atmospheric methane. However, there remains a paucity of data and understanding of marsh methane dynamics. The objectives of this study were to measure the ecosystem scale methane flux (FCH4) of a temperate freshwater marsh and to try to determine the drivers of the flux as well as the pathways of emission. Methane flux as well as net carbon dioxide flux (NEE) of a cool-temperate freshwater marsh were measured over a growing season using the eddy covariance method. FCH4 was found to be 28.4 g C m-2 and NEE was -224 g C m-2 over a 4-month period (June – September) FCH4 was lower than what has been found in other marsh studies; likely due to the marsh experiencing a secular change towards higher water levels and lower biomass. These conditions resulted in lower than average NEE and, likely, less labile C substrates available for methanogenesis. FCH4 displayed variability at the daily, synoptic, and seasonal scales that were found to be driven by gross primary productivity (GPP) at a 15-hour time lag, atmospheric pressure, and soil temperature, respectively. The different pathways of methane emission were found to be, on average, 0.72 ± 0.21 g C m-2 day-1, 0.48 ± 0.47 g C m-2 day-1, and 6.6 ± 2.2 mg C m-2 day-1 for plant mediated transport, diffusion, and ebullition, respectively. When FCH4 and NEE are combined, the marsh remained a net carbon sink of 195.6 g C m-2 over the growing season"--
