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• W2057065557 abstract "Ma, A.; Lu, J., and Wang, T., 2012. Effects of elevation and vegetation on methane emissions from a freshwater estuarine wetland.Methane (CH4) emission rates from three different tidal elevations were measured in a freshwater wetland of the Yangtze River, China, estuary using a modified, static, closed-chamber technique. The intertidal zone covered by Phragmites australis is a source of atmospheric CH4. The site at a higher elevation had lower CH4 emissions than did a lower-elevation site (1.322 ± 1.15 mg m−2 h−1 vs. 11.66 ± 12.5 mg m−2 h−1). Methane emissions from the mudflats were negligible. Methane emissions showed remarkable seasonal variations, with the largest emissions occurring in summer and late-summer and the smallest emissions occurring in early spring. Although CH4 emissions were related to soil temperature at depths of 5–10 cm, differences in CH4 emissions among sites were mainly determined by the presence of P. australis. Simulatied experiments did not find significant differences in CH4 fluxes between sites exposed to different submergence frequencies in the absence of plants, presumably because of substrate limitations. A higher tidal submergence frequency in the vegetated areas stimulated methanogenesis by enhancing vegetation photosynthesis and increasing the amount of plant litter submerged in water. The CH4 flux rates from the clipped and unclipped sites differed significantly during the growing season. This highlights the importance of plants in the CH4 flux, both as gas-transport conduits and through labile carbon production. The average net photosynthetic rate of P. australis at the lower elevation was higher (0.57 ± 0.2 gC m−2 h−1) than that at the higher elevation (0.43 ± 0.1 gC m−2 h−1), and more carbon was fixed and served as potential substrates for CH4 production. The CH4-C emissions played a minimal role in the carbon flux, which was about 0.3% for the higher-elevation site and 1.6% for the lower-elevation site. This suggests that high CH4 emission rates in freshwater wetlands may be explained by higher plant photosynthetic carbon fixation." @default.
• W2057065557 created "2016-06-24" @default.
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• W2057065557 date "2012-11-01" @default.
• W2057065557 modified "2023-09-27" @default.
• W2057065557 title "Effects of Elevation and Vegetation on Methane Emissions from a Freshwater Estuarine Wetland" @default.
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• W2057065557 doi "https://doi.org/10.2112/jcoastres-d-11-00001.1" @default.
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