globalchange  > 气候减缓与适应
DOI: 10.1007/s10533-015-0085-4
Scopus记录号: 2-s2.0-84939943384
论文题名:
Spatial and temporal variability in carbon dioxide and methane exchange at three coastal marshes along a salinity gradient in a northern Gulf of Mexico estuary
作者: Wilson B.J.; Mortazavi B.; Kiene R.P.
刊名: Biogeochemistry
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2015
卷: 123, 期:3
起始页码: 329
结束页码: 347
语种: 英语
英文关键词: Carbon dioxide ; Climate change ; Ecosystem respiration ; Methane ; Mobile Bay Alabama ; Primary production
英文摘要: Carbon gas fluxes in tidal marshes vary spatially and temporally because of vegetation cover, subsurface biogeochemical processes, and environmental forcing. The objective of this study was to examine how ecosystem carbon gas exchange changes along an estuarine salinity gradient. We measured carbon dioxide (CO2) and methane (CH4) gas fluxes from three marshes representing a salinity gradient (0–32 ppt) in the Mobile Bay estuary, Alabama, USA. CH4 flux was relatively small with no significant differences across sites despite salinity differences. Interestingly, sediment porewater CH4 concentrations were significantly higher at the high salinity salt marsh and decreased with decreasing salinity. Midday net ecosystem exchange (where a positive rate indicates net carbon assimilated through photosynthesis) was greatest at the most fresh site (4.8 ± 0.3 µmol CO2 m−2 s−1), followed by the saline (2.8 ± 1.0 µmol CO2 m−2 s−1) and brackish (1.4 ± 0.6 µmol CO2 m−2 s−1) sites. However, net ecosystem exchange integrated diurnally revealed each marsh to be a net CO2 source to the atmosphere as a result of high ecosystem respiration with the freshwater marsh emitting more CO2 (−893.4 ± 187.9 g C m−2 year−1) than the brackish (−517.8 ± 85.2 g C m−2 year−1) and salt marsh (−410.2 ± 98.2 g C m−2 year−1). This finding leads to the conclusion that either the marshes are losing carbon or that they receive a subsidy of respirable carbon, possibly via tidal deposition. The extent to which sedimentation from tidal deposition contributes carbon to these ecosystems, however, remains unknown. Without such a subsidy, marshes in the study area will not be able to keep up with sea level rise. © 2015, Springer International Publishing Switzerland.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83526
Appears in Collections:气候减缓与适应
气候变化事实与影响

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作者单位: Department of Biological Sciences, University of Alabama, Box 870344, Tuscaloosa, AL, United States; Department of Marine Sciences, University of South Alabama, Mobile, AL, United States; Dauphin Island Sea Lab, 101 Bienville Boulevard, Dauphin Island, AL, United States; Department of Biological Sciences, Florida International University, Miami, FL, United States

Recommended Citation:
Wilson B.J.,Mortazavi B.,Kiene R.P.. Spatial and temporal variability in carbon dioxide and methane exchange at three coastal marshes along a salinity gradient in a northern Gulf of Mexico estuary[J]. Biogeochemistry,2015-01-01,123(3)
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