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- W2462012199 abstract "The Sabine River floodplain, in southeast Texas, U.S.A., is a broad flat watershed which contains a diverse assemblage of blackwater wetland habitats. Methane fluxes were compared across a gradient of three different habitats, within the floodplain, that extended from the outer reaches of the basin to the river proper (i.e., blackgum Nyssa aquatica, cypress Taxodium distichum, and arrowhead Sagittaria spp.), as well as a fourth station (a Spartina marsh) within the Sabine-Neches estuary. Concentrations of dissolved organic carbon (DOC) in the floodplain were very high (15-50 mg/l). Methane emissions were highly variable and ranged from 0.0007 to 1640 mg m -2 d -1 , with the highest rates in July 1993. These highest CH 4 emission rates were observed just after the longest period of flooding (ca. 1 month) at each of the stations. Fluxes were significantly correlated (both positively and negatively) with precipitation (p<0.01) ; natural periods of flooding and drought were primarily responsible for the wide range of emissions. Methane consumption rates had little effect on total emissions because of losses by ebullition and plant-mediated transport mechanisms. Plant-mediated transport accounted for as much as 96% of the total CH 4 emissions at certain stations. Laboratory experiments indicated that UV-B treated humic substances were preferentially utilized by methanogens over untreated humic compounds. Thus, variability of light penetrance across a floodplain may affect the quality and ultimately the availability of DOC to methanogens. Finally, the similarity in peak CH 4 emissions, after a 1 month lag period of flooding, in both agricultural and natural wetlands of southeast Texas, may for the first time demonstrate a similar chronological sequence of microbial reactions for CH 4 production in divergent systems." @default.
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- W2462012199 date "1996-03-27" @default.
- W2462012199 modified "2023-09-23" @default.
- W2462012199 title "Temporal and spatial variability, and the role of dissolved organic carbon (DOC) in methane fluxes from the Sabine River Floodplain (Southeast Texas, U.S.A.)" @default.
- W2462012199 doi "https://doi.org/10.1127/archiv-hydrobiol/136/1996/261" @default.
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