000280632 001__ 280632
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000280632 020__ $$a978-3-95806-106-4
000280632 0247_ $$2Handle$$a2128/9708
000280632 0247_ $$2URN$$aurn:nbn:de:0001-2016022944
000280632 0247_ $$2ISSN$$a1866-1793
000280632 037__ $$aFZJ-2016-00397
000280632 041__ $$aEnglish
000280632 1001_ $$0P:(DE-Juel1)144687$$aHeil, Jannis$$b0$$eCorresponding author$$gmale$$ufzj
000280632 245__ $$aThe role of abiotic processes in the formation and degradation of gaseous nitrogen compounds in the soil$$f - 2015-07-31
000280632 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2015
000280632 300__ $$aXIV, 106 S.
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000280632 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1599640480_19886
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000280632 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v297
000280632 502__ $$aDissertation, Universität Bonn, 2015$$bDissertation$$cUniversität Bonn$$d2015
000280632 520__ $$aSoils are a major source of nitrogen (N) trace gases, especially of nitrous oxide (N$_{2}$O) and nitricoxide (NO). The two microbial processes nitrification and denitrification are considered the major contributors to these emissions. While microbial denitrification has long been identified as a sourceof N trace gases under reducing conditions, N trace gas formation under aerobic conditions is far from being completely understood. Several abiotic reactions involving the nitrification intermediateshydroxylamine (NH$_{2}$OH) and nitrite (NO$^{-}_{2}$) have been identified leading to N$_{2}$O and NO emissions,but are neglected in most current studies. Further, there is a potential a biotic sink function of soils for N$_{2}$O via photochemical destruction. For better N trace gas mitigation strategies, the identification of the major source and sink processes and their role in the global N cycle is vital. Prior to the experimental work, this thesis reviews information about the role of abiotic processes in the formation of N trace gases from the few available studies reporting on a biotic emissions. It merges the gained information into a new conceptual model explaining the formation of the N trace gases N$_{2}$O, NO, as well as gaseous nitrous acid (HONO) by coupled biotic–abiotic reaction mechanisms. The relevant reactions are: the self-decomposition of NO$^{-}_{2}$, reactions of NO$^{-}_{2}$ with reduced metal cations, the nitrosation of soil organic matter (SOM) by NO$^{-}_{2}$, the comproportionation of NO$^{-}_{2}$ and NH$_{2}$OH, and the oxidation of NH$_{2}$OH by manganese or iron. While reactions involving NO$^{-}_{2}$ have been shown to produce primarily NO, reactions of NH$_{2}$OH are known to lead to N$_{2}$O as their main product. In soils it is difficult to discriminate between biological and abiotic processes. Here, stable isotope techniques are a promising tool to give more insight into the production processes. Especially the site preference (SP) of 15N in N$_{2}$O can help to source partition between processes. Experiments have been designed to study the abiotic formation of N$_{2}$O from NH$_{2}$OH in solutions and in different non-sterile and sterile soils from forest, grassland, and cropland. While organic forest soils showed hardly any N$_{2}$O formation upon NH$_{2}$OH addition, an immediate and strong formation of N$_{2}$O was observed in cropland soil, also in sterilized samples. A correlation analysis revealed apotential positive relationship of the NH$_{2}$OH-induced N$_{2}$O formation with soil pH and manganese content, construing an effect of pH on NH$_{2}$OH stability and of manganese acting as an oxidation agent for NH$_{2}$OH. A negative correlation between abiotic N$_{2}$O formation and C/N ratio was found that could indicate a possible competitive reaction of NH$_{2}$OH with functional groups of SOM. Allabiotic N$_{2}$O production pathways showed a characteristic, high SP unaffected by reaction conditions. [...]
000280632 536__ $$0G:(DE-HGF)POF3-255$$a255 - Terrestrial Systems: From Observation to Prediction (POF3-255)$$cPOF3-255$$fPOF III$$x0
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