首页 | 本学科首页   官方微博 | 高级检索  
     


Emission of gaseous nitrogen oxides from an extensively managed grassland in NE Bavaria, Germany.
Authors:Jens Tilsner  Nicole Wrage  Jutta Lauf  Gerhard Gebauer
Affiliation:(1) Iowa State University, Ames, IA, USA
Abstract:We analysed the stable isotope composition of emitted N2O in a one-year field experiment (June 1998 to April 1999) in unfertilized controls, and after adding nitrogen by applying slurry or mineral N (calcium ammonium nitrate). Emitted N2O was analysed every 2–4 weeks, with additional daily sampling for 10 days after each fertilizer application. In supplementary soil incubations, the isotopic composition of N2O was measured under defined conditions, favouring either denitrification or nitrification. Soil incubated for 48 h under conditions favouring nitrification emitted very little N2O (0.024 mgrmol gdw–1) and still produced N2O from denitrification. Under denitrifying incubation conditions, much more N2O was formed (0.91 mgrmol gdw–1 after 48 h). The isotope ratios of N2O emitted from denitrification stabilized at delta15N = –40.8 ± 5.7permil and delta18O = 2.7 ± 6.3permil. In the field experiment, the N2O isotope data showed no clear seasonal trends or treatment effects. Annual means weighted by time and emission rate were delta15N = –8.6permil and delta18O = 34.7permil after slurry application, delta15N = –4.6permil and delta18O = 24.0permil after mineral fertilizer application and delta15N = –6.4permil and delta18O = 35.6permil in the control plots, respectively. So, in all treatments the emitted N2O was 15N-depleted compared to ambient air N2O (delta15N = 11.4 ± 11.6permil, delta18O = 36.9 ± 10.7permil). Isotope analyses of the emitted N2O under field conditions per se allowed no unequivocal identification of the main N2O producing process. However, additional data on soil conditions and from laboratory experiments point to denitrification as the predominant N2O source. We concluded (1) that the isotope ratios of N2O emitted from the field soil were not only influenced by the source processes, but also by microbial reduction of N2O to N2 and (2) that N2O emission rates had to exceed 3.4 mgrmol N2O m–2 h–1 to obtain reliable N2O isotope data.
Keywords:  /content/l6188lx174702773/xxlarge948.gif"   alt="  delta"   align="  BASELINE"   BORDER="  0"  >15N    /content/l6188lx174702773/xxlarge948.gif"   alt="  delta"   align="  BASELINE"   BORDER="  0"  >18O  Denitrification  Grassland  Nitrification  Nitrous oxide  Stable isotopes
本文献已被 SpringerLink 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号