期刊
出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/10934520903542261
关键词
CH4 flux; tidal marsh; tidal stages; seasonal variation; environmental conditions
资金
- National Science Foundation of China [40671174]
- Natural Sciences Foundation of Fujian Province [2006J0128]
- Fujian Province Physical Geography Key Discipline Construction Foundation
The total methane emission to the atmosphere and hydrosphere, and its seasonal variation, were estimated using an enclosed static chamber technique from a tidal marshes dominated by Phragmites australis (common reed) in the Min River estuary, southeast China. Measurements were taken at three tidal stages ( before flood, during the flooding and ebbing process, and after ebb). Potential rates of methane production from the marsh sediment layers were also measured using an incubation technique. This P. australis tidal marsh was a net methane source, emitting 32.59 and 6.87 g CH4.m(-2).yr(-1) to the atmosphere and hydrosphere, respectively. There was considerable monthly variation with emissions greater before flood in some months, whereas at other months emission was greater after ebb. The average methane fluxes were 5.13, 5.06 and 4.74 mg CH4 m(-2) h(-1) before flood, during flooding and ebbing, and after ebb, respectively. Emissions to the tidewater and the atmosphere during the flooding and ebbing process were 2.98 and 2.08 mg CH4 m(-2) h(-1), respectively. Sediment methane production potential (0-40 cm depth) ranged from 0.028-0.123 mu g CH4.g(-1).d(-1), with the greatest production was in the surface soil. Methane fluxes had a significant correlation with atmospheric, sediment temperature and above ground biomass. The implications of these data for global warming are discussed briefly.
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