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• W1981732120 abstract "Irrigated rice paddies are one of the few methane (CH 4 ) sources where the management of its emissions may be possible. Before that can be initiated, however, the relationship between production, oxidation, and emission of CH 4 and the processes controlling them must be better known. To that end we have made measurements of concentration and stable carbon and hydrogen isotopes of CH 4 and CO 2 in paddy fields along the Gulf Coast of Texas. Although only small differences in total CH 4 flux (∼46.5 g m −2 clayey and ∼43 g m −2 sandy) and average δ 13 CH 4 (seasonal averages of −56.11±1.21‰ clayey and −53.57±0.97‰ sandy) from emitted CH 4 were observed in two plots with different soil textures, by making additional measurements of belowground CH 4 and CO 2 we learned much about processes occurring in the paddy field. We estimated that roughly 98% of the CH 4 released was transported through the plant and that residence times for belowground CH 4 were from about 1 to 5 hours during most of the season, indicating fast processing of both organic carbon and current photosynthesized carbon to make CH 4 . The percentage of CH 4 made from acetate fermentation calculated using isotope data was strongly dependent on the value of the fractionation factor (α) associated with the CO 2 /H 2 reduction pathway for CH 4 formation. Using a range of reasonable values for α, we calculated that acetate fermentation was from 67 to 80% early in the season to 29 to 60% late in the season (generally decreasing as the season progressed). Most importantly, we have strong evidence that rhizospheric CH 4 oxidation occurs in paddy fields. We have developed a semiempirical equation and used it to calculate the percent of CH 4 oxidized as a function of total CH 4 produced from field measurements of δ 13 CH 4 under natural conditions. Because most emitted CH 4 is transported by the rice plant, it was necessary to determine the isotopic fractionation CH 4 underwent during its transport through the plant. This value, 12±l‰, was used to calculate oxidation percent using belowground and emitted δ 13 CH 4 values. In Texas, oxidation of CH 4 in the soil increased from ∼20 to ∼60% over the 6 week period just prior to harvest." @default.
• W1981732120 created "2016-06-24" @default.
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• W1981732120 date "1997-09-01" @default.
• W1981732120 modified "2023-10-06" @default.
• W1981732120 title "Methane oxidation and pathways of production in a Texas paddy field deduced from measurements of flux, δ^l3C, and δD of CH₄" @default.
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• W1981732120 doi "https://doi.org/10.1029/97gb01624" @default.
• W1981732120 hasPublicationYear "1997" @default.
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