NitroScape: A model to integrate nitrogen transfers and transformations in rural landscapes
2011
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.
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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