NitroScape: a model to integrate nitrogen transfers and transformations in rural landscapes |
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| Authors: | Duretz S Drouet J L Durand P Hutchings N J Theobald M R Salmon-Monviola J Dragosits U Maury O Sutton M A Cellier P |
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| Institution: | aINRA-AgroParisTech, UMR 1091 Environnement et Grandes Cultures (EGC), 78850 Thiverval-Grignon, France;bINRA-AgroCampus, UMR 1069 Sol Agro et hydrosystème Spatialisation (SAS), 35042 Rennes cedex, France;cDepartment of Agroecology, Faculty of Agricultural Sciences, University of Aarhus (AU), Blichers Allé, 8830 Tjele, Denmark;dDepartment of Chemistry and Agricultural Analysis, Technical University of Madrid (UPM), 28040 Madrid, Spain;eCentre for Ecology and Hydrology (CEH), Bush Estate, Penicuik, Midlothian EH26 0QB, UK |
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| Abstract: | Modelling nitrogen transfer and transformation at the landscape scale is relevant to estimate the mobility of the reactive forms of nitrogen (Nr) and the associated threats to the environment. Here we describe the development of a spatially and temporally explicit model to integrate Nr transfer and transformation at the landscape scale. The model couples four existing models, to simulate atmospheric, farm, agro-ecosystem and hydrological Nr fluxes and transformations within a landscape. Simulations were carried out on a theoretical landscape consisting of pig-crop farms interspersed with unmanaged ecosystems. Simulation results illustrated the effect of spatial interactions between landscape elements on Nr fluxes and losses to the environment. More than 10% of the total N2O emissions were due to indirect emissions. The nitrogen budgets and transformations of the unmanaged ecosystems varied considerably, depending on their location within the landscape. The model represents a new tool for assessing the effect of changes in landscape structure on Nr fluxes. |
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| Keywords: | Reactive N fluxes N cascade Integrated model Dynamic model Spatially distributed model Landscape scale |
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