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1 Karlsruhe Research Centre 2 Risoe National Laboratory 3 Federal Institute for Geosciences and Natural Resources BGR 4 The Netherlands Organization for Applied Scientific Research 5 Hungarian Meteorological Service 6 Federal Forest Research Centre 7 Commission of the European Communities 8 Institute for Study of Earth, Oceans and Space 9 University of Helsinki Helsinki 10 Norwegian Meteorology Institute 11 NERC - Natural Environment Research Council

Abstract : Forest soils are a significant source for the primary and secondary greenhouse gases N2O and NO. However, current estimates are still uncertain due to the still limited number of field measurements and the herein observed pronounced variability of N trace gas fluxes in space and time, which are due to the variation of environmental factors such as soil and vegetation properties or meteorological conditions. To overcome these problems we further developed a process-oriented model, the PnET-N-DNDC model, which simulates the N trace gas exchange on the basis of the processes involved in production, consumption and emission of N trace gases. This model was validated against field observations of N trace gas fluxes from 19 sites obtained within the EU project NOFRETETE, and shown to perform well for N2O r2=0.68, slope=0.76 and NO r2=0.78, slope=0.73. For the calculation of a European-wide emission inventory we linked the model to a detailed, regionally and temporally resolved database, comprising climatic properties daily resolution, and soil parameters, and information on forest areas and types for the years 1990, 1995 and 2000. Our calculations show that N trace gas fluxes from forest soils may vary substantial from year to year and that distinct regional patterns can be observed. Our central estimate of NO emissions from forest soils in the EU amounts to 98.4, 84.9 and 99.2 kt N yr?1, using meteorology from 1990, 1995 and year 2000, respectively. This is

Autor: M. Kesik - P. Ambus - R. Baritz - N. Brüggemann - K. Butterbach-Bahl - M. Damm - J. Duyzer - L. Horváth - R. Kiese - B. Kitzler



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