Biogeosciences www.biogeosciences.net 1726-4170 1726-4189 3 3 2006 10.5194/bg-3-293-2006 http://www.biogeosciences.net/3/293/2006/ http://www.biogeosciences.net/3/293/2006/bg-3-293-2006.html http://www.biogeosciences.net/3/293/2006/bg-3-293-2006.pdf 293 310 2006-07-12 Nitrogen oxides emission from two beech forests subjected to different nitrogen loads B. Kitzler barbara.kitzler@bfw.gv.at S. Zechmeister-Boltenstern C. Holtermann U. Skiba K. Butterbach-Bahl Federal Research and Training Centre for Forests, Natural Hazards and Landscape (BFW), Seckendorff-Gudent-Weg 8, Vienna, Austria Sellenyg. 2–4/52, Vienna, Austria Institute of Terrestrial Ecology, Bush Estate, Penicuik, Midlothian EH26 OQB, Scotland Institute for Meteorology and Climate Research, Atmospheric Environmental Research, Forschungszentrum Karlsruhe, Kreuzeckbahnstra{ß We analysed nitrogen oxides (N₂O, NO) and carbon dioxide (CO₂) emissions from two beech forest soils close to Vienna, Austria, which were exposed to different nitrogen input from the atmosphere. The site Schottenwald (SW) received 20.2 kg N ha^−1 y^−1 and Klausenleopoldsdorf (KL) 12.6 kg N ha^−1 y^−1 through wet deposition. Nitric oxide emissions from soil were measured hourly with an automatic dynamic chamber system. Daily N₂O measurements were carried out by an automatic gas sampling system. Measurements of nitrous oxide (N₂O) and CO₂ emissions were conducted over larger areas on a biweekly (SW) or monthly (KL) basis by manually operated chambers. We used an autoregression procedure (time-series analysis) for establishing time-lagged relationships between N-oxides emissions and different climate, soil chemistry and N-deposition data. It was found that changes in soil moisture and soil temperature significantly effected CO₂ and N-oxides emissions with a time lag of up to two weeks and could explain up to 95% of the temporal variations of gas emissions. Event emissions after rain or during freezing and thawing cycles contributed significantly (for NO 50%) to overall N-oxides emissions. In the two-year period of analysis the annual gaseous N₂O emissions at SW ranged from 0.64 to 0.79 kg N ha^−1 y^−1 and NO emissions were 0.24 to 0.49 kg N ha^−1 per vegetation period. 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