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- W2093555585 abstract "Summary As part of a study to simulate plant responses to leaks from pipelines, we injected natural gas into soil at a depth of 1 m in plots of grass, wheat and beans. Measurements of oxygen and methane in soil exposed to gas show that oxygen is depleted significantly to values less than would be caused by simple displacement by natural gas, indicating consumption within the soil by methanotrophic bacteria. Gas concentrations were clustered into two groups: 18% of the oxygen values were less than 1% by volume and 52% of the methane values were less than 5% by volume, indicating a tendency towards either oxygen‐limiting or methane‐limiting conditions. Oxygen depletion was significantly greater in summer. Depletion rates were greatest under grass, and least under wheat. In grass, 36% of the variation in depletion is explained by soil temperature at 10 cm with Q 10 = 2.0 over the 0–20°C range. We developed a model that accounts for three gas exchange mechanisms: soil‐air displacement by the injected gas; gas consumption by bacteria; and re‐infusion of the soil atmosphere to account for a net loss of gas volume by consumption. Using this model, we calculate that an average of 37% of the methane was consumed. At initial methane concentrations less than 10% by volume, as much as 100% of the gas was consumed, but consumption efficiency decreased rapidly thereafter. These findings indicate that the soil sink for methane is dynamic and adaptive, acting as a significant constraint on underground methane sources, limited primarily by oxygen availability." @default.
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- W2093555585 date "2006-11-21" @default.
- W2093555585 modified "2023-09-28" @default.
- W2093555585 title "Oxygen and methane depletion in soil affected by leakage of natural gas" @default.
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- W2093555585 doi "https://doi.org/10.1111/j.1365-2389.2005.00770.x" @default.
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