Comparison of land nitrogen budgets for European agriculture by various modeling approaches |
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| Authors: | de Vries W Leip A Reinds G J Kros J Lesschen J P Bouwman A F |
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| Institution: | aAlterra, Wageningen University and Research Centre, P.O. Box 47, 6700 AA Wageningen, The Netherlands;bEnvironmental Systems Analysis Group, Wageningen University, P.O. Box 47, 6700 AA Wageningen, The Netherlands;cEuropean Commission, Joint Research Centre, Institute for Environment and Sustainability, Via E. Fermi 2749, I-21027 Ispra (VA), Italy;dNetherlands Environmental Assessment Agency, P.O. Box 303, 3720 AH Bilthoven, The Netherlands |
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| Abstract: | A comparison of nitrogen (N) budgets for the year 2000 of agro-ecosystems is made for the EU 27 countries by four models with different complexity and data requirements, i.e. INTEGRATOR, IDEAg, MITERRA and IMAGE. The models estimate a comparable total N input in European agriculture, i.e. 23.3–25.7 Mton N yr−1, but N uptake varies more, i.e. from 11.3 to 15.4 Mton N yr−1 leading to total N surpluses varying from 10.4 to 13.2 Mton N yr−1. The estimated overall variation at EU 27 is small for the emissions of ammonia (2.8–3.1 Mton N yr−1) and nitrous oxide (0.33–0.43 Mton N yr−1), but large for the sum of N leaching and runoff (2.7–6.3 Mton N yr−1). Unlike the overall EU estimates, the difference in N output fluxes between models is large at regional scale. This is mainly determined by N inputs, differences being highest in areas with high livestock density. |
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| Keywords: | Nitrogen Budgets Agriculture Modeling Ammonia Nitrous oxide Agro-ecosystems |
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