Quantifying the Regional Source Strength of N-Trace Gases Across Agricultural and Forest Ecosystems with Process Based Models
Plant and Soil 260: 311–329, 2004. 311 © 2004 Kluwer Academic Publishers. Printed in the Netherlands. Quantifying the regional source strength of N-trace gases across agricultural and forest ecosystems with process based models K. Butterbach-Bahl1,3,M.Kesik1,P.Miehle1, H. Papen1 &C.Li2 1Institute for Meteorology and Climate Research, Atmospheric Environmental Research, Karlsruhe Research Centre, Garmisch-Partenkirchen, Germany. 2Institute for the Study of Earth, Oceans, and Space, University of New Hampshire, USA. 3Corresponding author∗ Received 23 December 2002. Accepted in revised form 22 October 2003 Key words: process based models, PnET-N-DNDC, DNDC, soil NO/ N2O-inventory Abstract The process-based models DNDC and PnET-N-DNDC were evaluated with regard to their potential to calculate regional inventories of N-trace gas emissions from agricultural and forest soils. To extend the model predictions to regional scale, we linked the models to a detailed GIS-database for Saxony, Germany, which was holding all the spatially and temporally differentiated input information and other model drivers. Total annual N2O-emissions from −1 −1 agricultural soils in Saxony ranged from 0.5–26.0 kg N2O-N ha yr and were calculated to amount to approx. −1 5475 t N2O-N yr in the year 1995, which compares quite well with previous estimates based on the IPCC −1 approach (4892 t N2O-N yr ). Compared to the agricultural soils, N2O-emissions from forest soils in Saxony −1 −1 −1 (range: 0.04–19.7 kg N2O-N ha yr ) were much lower and amounted to 1011 t N2O-N yr .
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