000838934 001__ 838934
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000838934 0247_ $$2Handle$$a2128/16004
000838934 0247_ $$2URN$$aurn:nbn:de:0001-2017120725
000838934 0247_ $$2ISSN$$a1866-1793
000838934 020__ $$a978-3-95806-272-6
000838934 037__ $$aFZJ-2017-07437
000838934 041__ $$aEnglish
000838934 1001_ $$0P:(DE-Juel1)156153$$aLiu, Shurong$$b0$$eCorresponding author$$ufzj
000838934 245__ $$aCoupled biotic-abiotic mechanisms of nitrous oxide production in soils during nitrification involving the reactive intermediates hydroxylamineand nitrite$$f- 2017-09-14
000838934 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2017
000838934 300__ $$a148 S.
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000838934 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1511947693_9735
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000838934 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v396
000838934 502__ $$aUniversität Bonn, Diss., 2017$$bDissertation$$cUniversität Bonn$$d2017
000838934 520__ $$aNitrous oxide (N$_{2}$O) is an important greenhouse gas that can deplete the ozone layer. Microbial nitrification and denitrification have been long considered as the major contributors of soil N$_{2}$O production. However, the mechanisms responsible for N$_{2}$O production from nitrification are still not fully understood. The current understanding is that there are mainly two routes responsible for the N$_{2}$O production from nitrification: biological ammonia (NH$_{3}$) oxidation and nitrifier denitrification of nitrite (NO$_{2}^{-}$). However, so far it has been neglected that abiotic processes could also play an important role in the N$_{2}$O production during nitrification, involving the two reactive N intermediates hydroxylamine (NH$_{2}$OH) and NO$_{2}$-via coupled biotic-abiotic mechanisms of N$_{2}$O production. While the abiotic N$_{2}$O production from NO$_{2}^{-}$ has been studied in the last decades, the abiotic N$_{2}$O production involving NH$_{2}$OH has long been ignored. One possible reason could be that NH$_{2}$OH was not detected in soils in previous research. In addition, the release of NH$_{2}$OH during NH$_{3}$ oxidation in pure cultures of ammonia oxidizers has not been studied previously, which would be the prerequisite of abiotic N$_{2}$O production involving NH$_{2}$OH. Therefore, the aim of the present thesis was to study the relevance and mechanisms of coupled biotic-abiotic N$_{2}$O formation from NH$_{2}$OH and NO$_{2}^{-}$ during nitrification in different soils. By studying different types of ammonia oxidizers (ammonia-oxidizing bacteria (AOB), ammonia-oxidizing archaea (AOA), and complete ammonia oxidizers (comammox)), this thesis demonstrates NH$_{2}$OH release during NH$_{3}$ oxidation of various ammonia oxidizers. However, the NH$_{2}$OH:final product release ratios were different between the different microbial strains studied, ranging from 0.24% to 1.92%, and were also dependent on initial NH$_{3}$ concentrations in the medium. The presence of NO$_{2}$ - decreased the abiotic NH$_{2}$OH decay rate in the medium but increased abiotic N$_{2}$O production involving NH$_{2}$OH. The calculated fraction of NH$_{4}^{+}$ converted to N$_{2}$O via NH$_{2}$OH release during incubations ranged from 0.05% to 0.14%, which was consistent with published NH$_{4}^{+}$-to-N$_{2}$O conversion ratios for certain ammonia oxidizers. [...]
000838934 536__ $$0G:(DE-HGF)POF3-255$$a255 - Terrestrial Systems: From Observation to Prediction (POF3-255)$$cPOF3-255$$fPOF III$$x0
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