Measurement of nitrous oxide emission from agricultural land using micrometeorological methods
Hargreaves, K. J.; Wienhold, F. G.; Klemedtsson, L.; Arah, J. R. M.; Beverland, I .J.; Fowler, D.; Galle, B.; Griffith, D. W. T.; Skiba, U.; Smith, K. A.; Welling, M.; Harris, G.W.. 1996 Measurement of nitrous oxide emission from agricultural land using micrometeorological methods. Atmospheric Environment, 30 (10-11). 1563-1571. 10.1016/1352-2310(95)00468-8Full text not available from this repository.
The spatial variability of N2O emission from soil makes extrapolation to the field scale very difficult using; conventional chamber techniques ( < 1 m2). Micrometeorological techniques, which integrate N2O fluxes over areas of 0.1 to 1 km2 were therefore developed and compared with chamber methods over arable cropland. Measurements of N2O emission from an unfertilised organic soil (reclaimed from the sea in 1879) were made over a 10 d period at Lammefjord, Denmark. Flux-gradient and conditional sampling techniques were applied using two tunable diode laser spectrometers (TDLs), a Fourier transform infra-red spectrometer (FTIR) and a gas chromatograph (GC). Eddy covariance measurements were also made by the TDLs. Over the 10 d campaign approximately 5 d of continuous fluxes by the different methods were, obtained. Fluxes determined by eddy covariance were in reasonable agreement, showing a mean flux of 269 μg N m2 h−1. Flux-gradient techniques measured a mean flux of 226 μg N m−2 h−1. The mean flux measured by conditional sampling was 379 μg N m−2 h−1. The maximum annual emission of N2O from this soil system was estimated to be 23.5 kg N ha−1.
|Programmes:||CEH Programmes pre-2009 publications > Biogeochemistry|
|CEH Sections:||_ Biogeochemistry & Ecosystem Function|
|Additional Keywords:||Eddy covariance, conditional sampling, flux gradient, Bowen ratio, nitrous oxide, greenhouse gas|
|NORA Subject Terms:||Agriculture and Soil Science
Ecology and Environment
|Date made live:||13 May 2009 12:31|
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