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- W2183798889 abstract "Recent studies have highlighted fluctuations in the carbon isotope content ( 13C) of CO2 produced by soil respiration. These have been correlated with diel cycles of environmental forcing (e.g., soil temperature), or with synoptic weather events (e.g., rain events and pressure-induced ventilation). We used an extensive suite of observations to examine these phenomena over two months in a subalpine forest in Colorado, USA (the Niwot Ridge AmeriFlux site). Measurements included automated soil respiration chambers and automated measurements of the soil gas profile. We found 1) no diel change in the 13C of the soil surface flux or the CO2 produced in the soil (despite strong diel change in surface flux rate), 2) no change in 13C following wetting (despite a significant increase in soil flux rate), and 3) no evidence of pressure-induced ventilation of the soil. Measurements of the 13C of surface CO2 flux agreed closely with the isotopic composition of soil CO2 production calculated using soil profile measurements. Temporal variation in the 13C of surface flux was relatively minor and unrelated to measured environmental variables. Deep in the soil profile, results conform to established theory regarding diffusive soil gas transport and isotopic fractionation, and suggest that sampling soil gas at a depth of several tens of centimeters is a simple and effective way to assess the mean 13C of the surface flux." @default.
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- W2183798889 date "2015-04-01" @default.
- W2183798889 modified "2023-09-27" @default.
- W2183798889 title "Environmental forcing does not lead to variation in carbon isotope content of forest soil respiration" @default.
- W2183798889 hasPublicationYear "2015" @default.
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