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- W2017490039 abstract "Here we describe a newly designed system with three stand-alone working incubation vessels for simultaneous measurements of N2, N2O, NO, and CO2 emissions from soil. Due to the use of a new micro thermal conductivity detector and the redesign of vessels and gas sampling a so-far unmatched sensitivity (0.23 μg N2–N h–1 kg–1 ds or 8.1 μg N2–N m–2 h–1) for detecting N2 gas emissions and repeatability of experiments could be achieved. We further tested different incubation methods to improve the quantification of N2 emission via denitrification following the initialization of soil anaerobiosis. The best results with regard to the establishment of a full N balance (i.e., the changes in mineral N content being offset by simultaneous emission of N gases) were obtained when the anaerobic soil incubation at 25 °C was preceded by soil gas exchange under aerobic conditions at a lower incubation temperature. The ratios of N and C gas emission changed very dynamically following the initialization of anaerobiosis. For soil NO3– contents of 50 mg N kg–1 dry soil (ds) and dissolved organic carbon (DOC) concentrations of approximately 300 mg C kg–1 ds, the cumulative emissions of N2, N2O, and NO were 24.3 ± 0.1, 12.6 ± 0.4, and 10.1 ± 0.3 mg N kg–1 ds, respectively. Thus, N gas emissions accounted (on average) for 46.2% (N2), 24.0% (N2O), and 19.2% (NO) of the observed changes in soil NO3–. The maximum N2 emission reached 1200 μg N h–1 kg–1 ds, whereas the peak emissions of N2O and NO were lower by a factor of 2–3. The overall N2:N2O and NO:N2O molar ratios were 1.6–10.0 and 1.6–2.3, respectively. The measurement system provides a reliable tool for studying denitrification in soil because it offers insights into the dynamics and magnitude of gaseous N emissions due to denitrification under various incubation conditions." @default.
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- W2017490039 date "2011-06-16" @default.
- W2017490039 modified "2023-09-29" @default.
- W2017490039 title "Measurement of N<sub>2</sub>, N<sub>2</sub>O, NO, and CO<sub>2</sub> Emissions from Soil with the Gas-Flow-Soil-Core Technique" @default.
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- W2017490039 doi "https://doi.org/10.1021/es1036578" @default.
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