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001     280632
005     20220930130055.0
020 _ _ |a 978-3-95806-106-4
024 7 _ |a 2128/9708
|2 Handle
024 7 _ |a urn:nbn:de:0001-2016022944
|2 URN
024 7 _ |a 1866-1793
|2 ISSN
037 _ _ |a FZJ-2016-00397
041 _ _ |a English
100 1 _ |a Heil, Jannis
|b 0
|e Corresponding author
|g male
|0 P:(DE-Juel1)144687
|u fzj
245 _ _ |a The role of abiotic processes in the formation and degradation of gaseous nitrogen compounds in the soil
|f - 2015-07-31
260 _ _ |a Jülich
|c 2015
|b Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag
300 _ _ |a XIV, 106 S.
336 7 _ |a Output Types/Dissertation
|2 DataCite
336 7 _ |a Book
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336 7 _ |a DISSERTATION
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336 7 _ |a PHDTHESIS
|2 BibTeX
336 7 _ |a Thesis
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|2 EndNote
336 7 _ |a Dissertation / PhD Thesis
|b phd
|m phd
|0 PUB:(DE-HGF)11
|s 1599640480_19886
|2 PUB:(DE-HGF)
336 7 _ |a doctoralThesis
|2 DRIVER
490 0 _ |a Schriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment
|v 297
502 _ _ |a Dissertation, Universität Bonn, 2015
|c Universität Bonn
|b Dissertation
|d 2015
520 _ _ |a Soils 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. [...]
536 _ _ |a 255 - Terrestrial Systems: From Observation to Prediction (POF3-255)
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650 _ 7 |x Diss.
856 4 _ |u https://juser.fz-juelich.de/record/280632/files/Energie_Umwelt_297.pdf
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