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Emission of gaseous nitrogen oxides from an extensively managed grassland in NE Bavaria, Germany. I. Annual budgets of N₂O and NOₓ emissions

Title data

Tilsner, Jens ; Wrage, Nicole ; Lauf, Jutta ; Gebauer, Gerhard:
Emission of gaseous nitrogen oxides from an extensively managed grassland in NE Bavaria, Germany. I. Annual budgets of N₂O and NOₓ emissions.
In: Biogeochemistry. Vol. 63 (2003) Issue 3 . - pp. 229-247.
ISSN 1573-515X
DOI: https://doi.org/10.1023/A:1023365432388

Abstract in another language

In a one-year field study (June 1998 to April 1999), we quantified N2O and NOx emissions from an extensively managed grassland in NE Bavaria ( Germany) in unfertilized controls and after application of slurry or mineral N ( calcium ammonium nitrate), respectively. Emissions were measured every 2-4 weeks, with additional daily measurements for 10 days after each fertilizer application. The closed chamber method was used for N2O and the open chamber method for NOx measurements. Fertilizer applications resulted in significantly increased N2O emission rates in comparison to the low annual mean of the control plots (1.4 µmol m-2 h-1). Episodical emission peaks during the summer were attributed to high microbial activity after rainfall. Mineral N fertilization resulted in the highest emission rates. Cumulative annual N2O emissions were 11.2 kg N ha-1 a-1 for the mineral N, 8.8 kg N ha-1 a-1 for the slurry and 3.4 kg N ha-1 a-1 for the control plots. This represents 10.5% ( mineral N) and 7.2% (slurry) of the applied nitrogen. The fertilizer-induced N2O emission factors on this extensively managed grassland are high in comparison to emission factors on intensively managed grassland and substantially higher than the 1.5% estimate used by the global emission inventory. NOx emissions increased after the first fertilizer application in summer, but not after the two following fertilizations in fall and spring. Differences between treatments were not significant. Annual NOx emissions were 1.9 kg N ha-1 a-1 for both, mineral N and slurry plots and 1.5 kg N ha-1 a-1 for the controls, representing 0.5% of the N applied with each fertilizer. The ratio of emitted NOx to N2O was 1: 4.7 for both fertilized treatments ( based on N-atoms).

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER25940
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Plant Ecology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 24 Sep 2015 09:38
Last Modified: 24 Sep 2015 09:38
URI: https://eref.uni-bayreuth.de/id/eprint/19587