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- W2239652870 abstract "Nitrous oxide emissions from fertilised grassland in the UK vary non-linearly with soil conditions, depending particularly on water-filled pore space (WFPS), temperature and mineral N content (1). An earlier simple empirical model (2) took account of the log-normal distribution of fluxes commonly observed and allocated fluxes to one of only three exponentially related classes, on the basis of measurements of these three variables. This very simple model has given a better fit to data than the established and much more complex DNDC model, but is limited by its dependence on the infrequency of measurement of the soil variables (usually ≥ 1 week). A new hybrid (part process-based, part empirical) version has been developed, using the Simile modelling framework, in which the WFPS and temperature are modelled with a daily timestep, thus allowing the simulation of N2O emissions also on a daily basis. The site parameters include soil sand, silt and clay content, water content at field capacity and wilting point, and soil bulk density. WFPS is calculated from an adapted soil water balance model, and soil temperature modelled using heat transfer theory. Daily time series of rainfall, minimum and maximum air temperatures, and fertiliser application dates and amounts are also required. A power law regression equation is fitted to the ratio of soil mineral N to the N applied, plotted against days since fertiliser application" @default.
- W2239652870 created "2016-06-24" @default.
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- W2239652870 date "2005-01-01" @default.
- W2239652870 modified "2023-09-26" @default.
- W2239652870 title "Predicting past, present and future N2O emissions from fertilised grassland" @default.
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- W2239652870 hasPublicationYear "2005" @default.
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