Dittert, Klaus

[["dc.bibliographiccitation.firstpage","2363"],["dc.bibliographiccitation.issue","21"],["dc.bibliographiccitation.journal","Rapid Communications in Mass Spectrometry"],["dc.bibliographiccitation.lastpage","2373"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Koester, Jan Reent"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Giesemann, Anette"],["dc.contributor.author","Lewicka-Szczebak, Dominika"],["dc.contributor.author","Muehling, Karl-Hermann"],["dc.contributor.author","Herrmann, Antje"],["dc.contributor.author","Lammel, Joachim"],["dc.contributor.author","Senbayram, Mehmet"],["dc.date.accessioned","2018-11-07T09:17:33Z"],["dc.date.available","2018-11-07T09:17:33Z"],["dc.date.issued","2013"],["dc.description.abstract","RATIONALEN(2)O isotopomer ratios may provide a useful tool for studying N2O source processes in soils and may also help estimating N2O reduction to N-2. However, remaining uncertainties about different processes and their characteristic isotope effects still hamper its application. We conducted two laboratory incubation experiments (i) to compare the denitrification potential and N2O/(N2O+N-2) product ratio of denitrification of various soil types from Northern Germany, and (ii) to investigate the effect of N2O reduction on the intramolecular N-15 distribution of emitted N2O. METHODSThree contrasting soils (clay, loamy, and sandy soil) were amended with nitrate solution and incubated under N-2-free He atmosphere in a fully automated incubation system over 9 or 28 days in two experiments. N2O, N-2, and CO2 release was quantified by online gas chromatography. In addition, the N2O isotopomer ratios were determined by isotope-ratio mass spectrometry (IRMS) and the net enrichment factors of the N-15 site preference (SP) of the N2O-to-N-2 reduction step ((SP)) were estimated using a Rayleigh model. RESULTSThe total denitrification rate was highest in clay soil and lowest in sandy soil. Surprisingly, the N2O/(N2O+N-2) product ratio in clay and loam soil was identical; however, it was significantly lower in sandy soil. The IRMS measurements revealed highest N2O SP values in clay soil and lowest SP values in sandy soil. The (SP) values of N2O reduction were between -8.2 and -6.1 , and a significant relationship between O-18 and SP values was found. CONCLUSIONSBoth experiments showed that the N2O/(N2O+N-2) product ratio of denitrification is not solely controlled by the available carbon content of the soil or by the denitrification rate. Differences in N2O SP values could not be explained by variations in N2O reduction between soils, but rather originate from other processes involved in denitrification. The linear O-18 vs SP relationship may be indicative for N2O reduction; however, it deviates significantly from the findings of previous studies. Copyright (c) 2013 John Wiley & Sons, Ltd."],["dc.description.sponsorship","German Federal Environmental Foundation (DBU)"],["dc.identifier.doi","10.1002/rcm.6699"],["dc.identifier.isi","000325254300009"],["dc.identifier.pmid","24097392"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/28198"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","1097-0231"],["dc.relation.issn","0951-4198"],["dc.title","Soil denitrification potential and its influence on N2O reduction and N2O isotopomer ratios"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.contributor.author","Rummel, Pauline Sophie"],["dc.contributor.author","Pfeiffer, Birgit"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Schneider, Dominik"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2020-05-27T11:48:41Z"],["dc.date.accessioned","2021-10-27T13:20:18Z"],["dc.date.available","2020-05-27T11:48:41Z"],["dc.date.available","2021-10-27T13:20:18Z"],["dc.date.issued","2020"],["dc.description.abstract","Chemical composition of root and shoot litter controls decomposition and, subsequently, C availability for biological nitrogen transformation processes in soils. While aboveground plant residues have been proven to increase $ emissions, studies on root litter effects are scarce. This study aimed (1) to evaluate how fresh maize root litter affects $ emissions compared to fresh maize shoot litter, (2) to assess whether $ emissions are related to the interaction of C and N mineralization from soil and litter, and (3) to analyze changes in soil microbial community structures related to litter input and $ emissions. To obtain root and shoot litter, maize plants (Zea mays L.) were cultivated with two N fertilizer levels in a greenhouse and harvested. A two-factorial 22 d laboratory incubation experiment was set up with soil from both N levels (N1, N2) and three litter addition treatments (control, root, root + shoot). We measured $ and $ fluxes, analyzed soil mineral N and water-extractable organic C (WEOC) concentrations, and determined quality parameters of maize litter. Bacterial community structures were analyzed using 16S rRNA gene sequencing. Maize litter quality controlled ^−_3$ and WEOC availability and decomposition-related $ emissions. Emissions induced by maize root litter remained low, while high bioavailability of maize shoot litter strongly increased $ and $ emissions when both root and shoot litter were added. We identified a strong positive correlation between cumulative $ and $ emissions, supporting our hypothesis that litter quality affects denitrification by creating plant-litter-associated anaerobic microsites. The interdependency of C and N availability was validated by analyses of regression. Moreover, there was a strong positive interaction between soil ^−_3$ and WEOC concentration resulting in much higher $ emissions, when both ^−_3$ and WEOC were available. A significant correlation was observed between total $ and $ emissions, the soil bacterial community composition, and the litter level, showing a clear separation of root + shoot samples of all remaining samples. Bacterial diversity decreased with higher N level and higher input of easily available C. Altogether, changes in bacterial community structure reflected degradability of maize litter with easily degradable C from maize shoot litter favoring fast-growing C-cycling and N-reducing bacteria of the phyla Actinobacteria, Chloroflexi, Firmicutes, and Proteobacteria. In conclusion, litter quality is a major driver of $ and $ emissions from crop residues, especially when soil mineral N is limited."],["dc.identifier.doi","10.5194/bg-2019-320"],["dc.identifier.doi","10.5194/bg-2019-320-supplement"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17344"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/91954"],["dc.language.iso","en"],["dc.notes.intern","Migrated from goescholar"],["dc.relation.orgunit","Fakultät für Agrarwissenschaften"],["dc.rights","CC BY 4.0"],["dc.rights.access","openAccess"],["dc.rights.uri","https://creativecommons.org/licenses/by/4.0"],["dc.subject","NITROUS-OXIDE EMISSIONS; CHEMICAL-COMPOSITION; MICROBIAL BIOMASS; CROP RESIDUES; SP-NOV.; HETEROTROPHIC NITRIFICATION; NITRIFIER DENITRIFICATION; CARBON MINERALIZATION; AGROFORESTRY RESIDUES; BIOCHEMICAL QUALITY"],["dc.subject.ddc","630"],["dc.title","Maize root and shoot litter quality controls short-term $ and $ emissions and bacterial community structure of arable soil"],["dc.type","preprint"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","5309"],["dc.bibliographiccitation.issue","11"],["dc.bibliographiccitation.journal","Applied Sciences"],["dc.bibliographiccitation.volume","11"],["dc.contributor.author","Rummel, Pauline Sophie"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Pfeiffer, Birgit"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2021-07-05T15:00:41Z"],["dc.date.available","2021-07-05T15:00:41Z"],["dc.date.issued","2021"],["dc.description.abstract","Returning crop residues to agricultural fields can accelerate nutrient turnover and increase N2O and NO emissions. Increased microbial respiration may lead to formation of local hotspots with anoxic or microoxic conditions promoting denitrification. To investigate the effect of litter quality on CO2, NO, N2O, and N2 emissions, we conducted a laboratory incubation study in a controlled atmosphere (He/O2, or pure He) with different maize litter types (Zea mays L., young leaves and roots, straw). We applied the N2O isotopocule mapping approach to distinguish between N2O emitting processes and partitioned the CO2 efflux into litter- and soil organic matter (SOM)-derived CO2 based on the natural 13C isotope abundances. Maize litter increased total and SOM derived CO2 emissions leading to a positive priming effect. Although C turnover was high, NO and N2O fluxes were low under oxic conditions as high O2 diffusivity limited denitrification. In the first week, nitrification contributed to NO emissions, which increased with increasing net N mineralization. Isotopocule mapping indicated that bacterial processes dominated N2O formation in litter-amended soil in the beginning of the incubation experiment with a subsequent shift towards fungal denitrification. With onset of anoxic incubation conditions after 47 days, N fluxes strongly increased, and heterotrophic bacterial denitrification became the main source of N2O. The N2O/(N2O+N2) ratio decreased with increasing litter C:N ratio and Corg:NO3− ratio in soil, confirming that the ratio of available C:N is a major control of denitrification product stoichiometry."],["dc.description.abstract","Returning crop residues to agricultural fields can accelerate nutrient turnover and increase N2O and NO emissions. Increased microbial respiration may lead to formation of local hotspots with anoxic or microoxic conditions promoting denitrification. To investigate the effect of litter quality on CO2, NO, N2O, and N2 emissions, we conducted a laboratory incubation study in a controlled atmosphere (He/O2, or pure He) with different maize litter types (Zea mays L., young leaves and roots, straw). We applied the N2O isotopocule mapping approach to distinguish between N2O emitting processes and partitioned the CO2 efflux into litter- and soil organic matter (SOM)-derived CO2 based on the natural 13C isotope abundances. Maize litter increased total and SOM derived CO2 emissions leading to a positive priming effect. Although C turnover was high, NO and N2O fluxes were low under oxic conditions as high O2 diffusivity limited denitrification. In the first week, nitrification contributed to NO emissions, which increased with increasing net N mineralization. Isotopocule mapping indicated that bacterial processes dominated N2O formation in litter-amended soil in the beginning of the incubation experiment with a subsequent shift towards fungal denitrification. With onset of anoxic incubation conditions after 47 days, N fluxes strongly increased, and heterotrophic bacterial denitrification became the main source of N2O. The N2O/(N2O+N2) ratio decreased with increasing litter C:N ratio and Corg:NO3− ratio in soil, confirming that the ratio of available C:N is a major control of denitrification product stoichiometry."],["dc.description.sponsorship","Deutsche Forschungsgemeinschaft"],["dc.description.sponsorship","Open-Access-Publikationsfonds 2021"],["dc.identifier.doi","10.3390/app11115309"],["dc.identifier.pii","app11115309"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/87882"],["dc.language.iso","en"],["dc.notes.intern","DOI Import DOI-Import GROB-441"],["dc.relation.eissn","2076-3417"],["dc.relation.orgunit","Abteilung Pflanzenernährung und Ertragsphysiologie"],["dc.rights","CC BY 4.0"],["dc.title","Carbon Availability and Nitrogen Mineralization Control Denitrification Rates and Product Stoichiometry during Initial Maize Litter Decomposition"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.subtype","original_ja"],["dc.type.version","published_version"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1671"],["dc.bibliographiccitation.issue","8"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","1677"],["dc.bibliographiccitation.volume","43"],["dc.contributor.author","Koester, Jan Reent"],["dc.contributor.author","Cardenas, Laura M."],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Bol, Roland"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Butler, Mark"],["dc.contributor.author","Muehling, Karl Hermann"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2018-11-07T08:53:50Z"],["dc.date.available","2018-11-07T08:53:50Z"],["dc.date.issued","2011"],["dc.description.abstract","Nitrous oxide (N(2)O) is one of the major greenhouse gases emitted from soils, where it is mainly produced by nitrification and denitrification. It is well known that rates of N(2)O release from soils are mainly determined by the availability of substrates and oxygen, but N(2)O source apportioning, highly needed to advance N(2)O mitigation strategies, still remains challenging. In this study, using an automated soil incubation system, the N(2)O site preference, i.e. the intramolecular 1514 distribution, was analyzed to evaluate the progression in N(2)O source processes following organic soil amendment. Biogas fermentation residue (BGR; originating from food waste fermentation) was applied to repacked grassland soil cores and compared to ammonium sulfate (AS) application, both at rates equivalent to 160 kg NH(4)(+)-N ha(-1), and to unamended soil (control). The soil cores were incubated in a helium-oxygen atmosphere with 20 kPa O(2) for 43 days at 80% water-filled pore space. 43-day cumulative N(2)O emissions were highest with BGR treated soil accounting for about 1.68 kg N(2)O-N ha(-1) while application of AS caused much lower fluxes of c. 0.23 kg N(2)O-N ha(-1). Also, after BGR application, carbon dioxide (CO(2)) fluxes showed a pronounced initial peak with steep decline until day 21 whereas with ammonium addition they remained at the background level. N(2)O dual isotope and isotopomer analysis of gas samples collected from BGR treated soil indicated bacterial denitrification to be the main N(2)O generating process during the first three weeks when high CO(2) fluxes signified high carbon availability. In contrast, in the second half after all added labile carbon substrates had been consumed, nitrification, i.e. the generation of N(2)O via oxidation of hydroxylamine, gained in importance reaching roughly the same N(2)O production rate compared to bacterial denitrification as indicated by N(2)O SP. Overall in this study, bacterial denitrification seemed to be the main N(2)O forming process after application of biogas residues and fluxes were mainly driven by available organic carbon. (C) 2011 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","Biotechnology and Biological Sciences Research Council (BBSRC)"],["dc.identifier.doi","10.1016/j.soilbio.2011.04.004"],["dc.identifier.isi","000292995300007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/22523"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","Rapid shift from denitrification to nitrification in soil after biogas residue application as indicated by nitrous oxide isotopomers"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","216"],["dc.bibliographiccitation.issue","1"],["dc.bibliographiccitation.journal","Rapid Communications in Mass Spectrometry"],["dc.bibliographiccitation.lastpage","222"],["dc.bibliographiccitation.volume","27"],["dc.contributor.author","Koester, Jan Reent"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Tuzson, Bela"],["dc.contributor.author","Bol, Roland"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Giesemann, Anette"],["dc.contributor.author","Emmenegger, Lukas"],["dc.contributor.author","Manninen, Albert"],["dc.contributor.author","Cardenas, Laura M."],["dc.contributor.author","Mohn, Joachim"],["dc.date.accessioned","2018-11-07T09:29:10Z"],["dc.date.available","2018-11-07T09:29:10Z"],["dc.date.issued","2013"],["dc.description.abstract","RATIONALE Nitrous oxide (N2O), a highly climate-relevant trace gas, is mainly derived from microbial denitrification and nitrification processes in soils. Apportioning N2O to these source processes is a challenging task, but better understanding of the processes is required to improve mitigation strategies. The N2O site-specific 15?N signatures from denitrification and nitrification have been shown to be clearly different, making this signature a potential tool for N2O source identification. We have applied for the first time quantum cascade laser absorption spectroscopy (QCLAS) for the continuous analysis of the intramolecular 15?N distribution of soil-derived N2O and compared this with state-of-the-art isotope ratio mass spectrometry (IRMS). METHODS Soil was amended with nitrate and sucrose and incubated in a laboratory setup. The N2O release was quantified by FTIR spectroscopy, while the N2O intramolecular 15?N distribution was continuously analyzed by online QCLAS at 1?Hz resolution. The QCLAS results on time-integrating flask samples were compared with those from the IRMS analysis. RESULTS The analytical precision (2 sigma) of QCLAS was around 0.3 parts per thousand for the delta 15Nbulk and the 15?N site preference (SP) for 1-min average values. Comparing the two techniques on flask samples, excellent agreement (R2?=?0.99; offset of 1.2 parts per thousand) was observed for the delta 15Nbulk values while for the SP values the correlation was less good (R2?=?0.76; offset of 0.9 parts per thousand), presumably due to the lower precision of the IRMS SP measurements. CONCLUSIONS These findings validate QCLAS as a viable alternative technique with even higher precision than state-of-the-art IRMS. Thus, laser spectroscopy has the potential to contribute significantly to a better understanding of N turnover in soils, which is crucial for advancing strategies to mitigate emissions of this efficient greenhouse gas. Copyright (c) 2012 John Wiley & Sons, Ltd."],["dc.identifier.doi","10.1002/rcm.6434"],["dc.identifier.isi","000312536700024"],["dc.identifier.pmid","23239336"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/30956"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Wiley-blackwell"],["dc.relation.issn","0951-4198"],["dc.title","Novel laser spectroscopic technique for continuous analysis of N2O isotopomers - application and intercomparison with isotope ratio mass spectrometry"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","55"],["dc.bibliographiccitation.journal","Geochimica et Cosmochimica Acta"],["dc.bibliographiccitation.lastpage","73"],["dc.bibliographiccitation.volume","134"],["dc.contributor.author","Lewicka-Szczebak, Dominika"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Koester, Jan Reent"],["dc.contributor.author","Fuss, Roland"],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Flessa, Heiner"],["dc.date.accessioned","2018-11-07T09:39:53Z"],["dc.date.available","2018-11-07T09:39:53Z"],["dc.date.issued","2014"],["dc.description.abstract","Quantifying denitrification in arable soils is crucial in predicting nitrogen fertiliser losses and N2O emissions. Stable isotopologue analyses of emitted N2O (delta N-15, delta O-18 and SP = N-15 site preference within the linear N2O molecule) may help to distinguish production pathways and to quantify N2O reduction to N-2. However, such interpretations are often ambiguous due to insufficient knowledge on isotopic fractionation mechanisms. Here we present a complex experimental approach to determine the net fractionation factors (eta) associated with denitrification. This determination is based on three laboratory experiments differing in their experimental set-up and soil properties. Static and dynamic incubation techniques were compared. All available methods for independent determination of N2O reduction contribution were used, namely, N-2-free atmosphere incubation, acetylene inhibition technique and N-15 gas-flux method. For N2O production: (i) the determined difference in delta O-18 between soil water and produced N2O vary from +18 parts per thousand to +42 parts per thousand and show very strict negative correlation with soil water saturation; (ii) the determined eta N-15 of N2O production vary from -55 parts per thousand to -38 parts per thousand and the fractionation decreases with decreasing substrate availability; (iii) the determined SP of produced N2O vary from -3 parts per thousand to +9 parts per thousand. For N2O reduction: (i) the determined eta O-18 and eta N-15 of N2O reduction vary in very wide ranges from -18 parts per thousand to +4 parts per thousand and from -11 parts per thousand to +12 parts per thousand, respectively, and depend largely on the differences in experimental setups; whereas (ii) the determined eta SP of N2O reduction shows a very consistent value with all previous studies and varies in a rather narrow range from -2 parts per thousand to -8 parts per thousand. It can be concluded that eta values of N2O production determined during laboratory incubations yield only roughly estimates for respective values expectable under field study conditions. eta O-18 and eta N-15 associated with N2O reduction may vary largely, probably depending on spatial and temporal coincidence of N2O production and reduction, and are hence not yet predictable for natural conditions. However, the eta SP of N2O reduction appeared to be relatively robust and a most probable value of about -5 parts per thousand can be used to constrain N2O reduction based on SP of soil emitted N2O. (C) 2014 Elsevier Ltd. All rights reserved."],["dc.description.sponsorship","German Research Foundation [DFG We/1904-4]"],["dc.identifier.doi","10.1016/j.gca.2014.03.010"],["dc.identifier.isi","000335136400004"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/33393"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","1872-9533"],["dc.relation.issn","0016-7037"],["dc.title","Experimental determinations of isotopic fractionation factors associated with N2O production and reduction during denitrification in soils"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","197"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","207"],["dc.bibliographiccitation.volume","104"],["dc.contributor.author","Wu, D. I."],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Brueggemann, Nicolas"],["dc.contributor.author","Pfeiffer, Birgit"],["dc.contributor.author","Loick, Nadine"],["dc.contributor.author","Stempfhuber, Barbara"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Bol, Roland"],["dc.date.accessioned","2018-11-07T10:29:36Z"],["dc.date.available","2018-11-07T10:29:36Z"],["dc.date.issued","2017"],["dc.description.abstract","The application of reactive nitrogen (N) in the form of synthetic/organic fertilizers plays a central role in supporting a larger human population, but also contributes to global warming through the emission of nitrous oxide (N2O). The use of nitrification inhibitors (Nls) has repeatedly been shown to minimize N2O emissions; however, their effectiveness in reducing N2O emissions varies greatly under different environmental conditions. A better understanding of how and to what extent NIs can mitigate fertilizer related soil-borne N2O emissions under a range of different conditions is required. In the present study, we carried out a soil incubation experiment in a fully automated continuous-flow incubation system under conditions favoring either nitrification- or denitrification-derived N2O emissions. Additionally, the abundance of AOB amoA, and AOA amoA genes was quantified and N2O isotopic signatures were analyzed. We mixed a common NI (PIADIN (R)) with mineral fertilizer (ammonium sulfate) and examined the N2O mitigation potential of the NI in a fertilized sandy soil (low denitrification potential) and a sandy soil mixed with wheat straw (high denitrification potential) at 70% water holding capacity (WHC). In non-NI treatments, the addition of straw led to a drastic increase of CO2 and N2O emissions compared to the non-straw-amended soils, suggesting stimulated microbial activity and higher denitrification rate. The NI reduced N2O emissions in the straw-amended treatment by 41%, whereas in the treatment without straw this was only 17%. With the combination of N2O isotopic signatures and functional gene abundances, fungal denitrification was considered to be the major process contributing to the higher N2O fluxes specifically in straw-amended soils. Overall, our study indicated that NI can be used as an effective method for mitigating N2O emissions in cropland specifically when the denitrification potential is high, e.g. in moist N-fertilized and straw-amended soils. (C) 2016 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.soilbio.2016.10.022"],["dc.identifier.isi","000389555900019"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/43673"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","PUB_WoS_Import"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","Nitrification inhibitors mitigate N2O emissions more effectively under straw-induced conditions favoring denitrification"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","217"],["dc.bibliographiccitation.issue","1-2"],["dc.bibliographiccitation.journal","Plant and Soil"],["dc.bibliographiccitation.lastpage","233"],["dc.bibliographiccitation.volume","459"],["dc.contributor.author","Rummel, Pauline Sophie"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Pfeiffer, Birgit"],["dc.contributor.author","Dittert, Klaus"],["dc.contributor.author","Floßmann, Sebastian"],["dc.contributor.author","Pausch, Johanna"],["dc.date.accessioned","2021-04-14T08:32:08Z"],["dc.date.available","2021-04-14T08:32:08Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.1007/s11104-020-04750-7"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/83818"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-399"],["dc.relation.eissn","1573-5036"],["dc.relation.issn","0032-079X"],["dc.title","Nitrate uptake and carbon exudation – do plant roots stimulate or inhibit denitrification?"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","65"],["dc.bibliographiccitation.journal","Soil Biology and Biochemistry"],["dc.bibliographiccitation.lastpage","74"],["dc.bibliographiccitation.volume","84"],["dc.contributor.author","Koester, Jan Reent"],["dc.contributor.author","Cardenas, Laura M."],["dc.contributor.author","Bol, Roland"],["dc.contributor.author","Lewicka-Szczebak, Dominika"],["dc.contributor.author","Senbayram, Mehmet"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Giesemann, Anette"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2018-11-07T09:58:01Z"],["dc.date.available","2018-11-07T09:58:01Z"],["dc.date.issued","2015"],["dc.description.abstract","Assessing effects of organic fertilizer applications on N2O emissions is of great interest because they can cause higher N2O emissions compared to inorganic fertilizers for a given amount of added nitrogen (N). But there are also reports about enhanced N2O reduction to climate-neutral elemental Ny after application of organic manures to soils. Factors controlling the N2O/(N2O + N-2) product ratio of denitrification are interrelated, and also the ratio is difficult to study because of limitations in N-2 flux measurements. In this study, we investigated N2O and N-2 emissions from soil treated with organic fertilizers with different C/N ratios. An N2O isotopomer approach combined with conventional N2O and Ny flux measurements was employed to study underlying microbial pathways. A grassland soil was amended with anaerobic digestate (AD) from food waste digestion (low C/N ratio) or cattle slurry (CS; high C/N ratio), respectively, adjusted to 90% WFPS, and incubated for 52 days under helium-oxygen atmosphere (10% O-2) using a soil incubation system capable of automated N2O, N-2, and CO2 measurements. N2O isotopomer signatures, i.e. the delta O-18 and SP values (site preference between N-15 at the central and the peripheral position in the N2O molecule), were determined by Isotope Ratio Mass Spectrometry and used to model and subsequently estimate the contribution of bacterial denitrification and autotrophic nitrification to N2O production. For this approach the direct determination of emitted N-2 is essential to take isotope effects during N2O reduction to N-2 into account by correcting the measured isotope signatures for isotope effects during N2O reduction using previously determined fractionation factor ranges. The addition of both organic fertilizers to soil drastically increased the rate of gaseous N emissions (N2O + N-2), probably due to the effects of concurrent presence of nitrate and labile C on the denitrification rate. In the initial phase of the experiment (day 1 to similar to 15), gaseous N emissions were dominated by N-2 fluxes in soils amended with organic manures; meanwhile, N2O emissions were lower compared to untreated Control soils, but increased after 15-20 days relative to the initial fluxes, especially with CS. Extremely low N2O, but high Ny emissions in the initial phase suggest that reduction of N2O to Ny via denitrification was triggered when the soil was amended with organic fertilizers. In contrast in the untreated Control, N2O release was highest during the initial phase. Total N2O release from AD treated soil was similar to Control, while N2O from CS treated soil was considerably higher, indicating that denitrification was triggered more by the high labile carbon content in CS, while the cumulative N2O/ (N2O + N-2) product ratio and thus N2O reduction were similar with both organic fertilizers. The results of the N2O source partitioning based on the isotopomer data suggest that about 8-25% (AD) and 33-43% (CS) of the cumulated N2O emission was due to nitrification in organically amended soil, while in the untreated Control nitrification accounted for about 5-16%. The remaining N2O production was attributed mainly to denitrification, while the poor model fit for other source pathways like fungal denitrification suggested their contribution to be of minor importance. The observed rather distinct phases with predominance first of denitrification and later of nitrification may help developing mitigation measures by addressing N2O source processes individually with appropriate management options. The observation of relatively large shares of nitrification-derived N2O is surprising, but may possibly be related to the low soil pH and will require further investigation. The determination of N-2 production is essential for this isotopomer-based source partitioning approach, but so far only applicable under laboratory conditions. The results of this study indicate that the combination of N2O delta O-18 and SP values is very useful in obtaining more robust source estimates as compared to using SP values alone. (C) 2015 Elsevier Ltd. All rights reserved."],["dc.identifier.doi","10.1016/j.soilbio.2015.01.021"],["dc.identifier.isi","000353087600007"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/37287"],["dc.notes.status","zu prüfen"],["dc.notes.submitter","Najko"],["dc.publisher","Pergamon-elsevier Science Ltd"],["dc.relation.issn","0038-0717"],["dc.title","Anaerobic digestates lower N2O emissions compared to cattle slurry by affecting rate and product stoichiometry of denitrification - An N2O isotopomer case study"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dc.type.peerReviewed","yes"],["dc.type.status","published"],["dspace.entity.type","Publication"]]

[["dc.bibliographiccitation.firstpage","1181"],["dc.bibliographiccitation.issue","4"],["dc.bibliographiccitation.journal","Biogeosciences"],["dc.bibliographiccitation.lastpage","1198"],["dc.bibliographiccitation.volume","17"],["dc.contributor.author","Rummel, Pauline Sophie"],["dc.contributor.author","Pfeiffer, Birgit"],["dc.contributor.author","Pausch, Johanna"],["dc.contributor.author","Well, Reinhard"],["dc.contributor.author","Schneider, Dominik"],["dc.contributor.author","Dittert, Klaus"],["dc.date.accessioned","2020-12-10T18:47:53Z"],["dc.date.available","2020-12-10T18:47:53Z"],["dc.date.issued","2020"],["dc.identifier.doi","10.5194/bg-17-1181-2020"],["dc.identifier.eissn","1726-4189"],["dc.identifier.purl","https://resolver.sub.uni-goettingen.de/purl?gs-1/17766"],["dc.identifier.uri","https://resolver.sub.uni-goettingen.de/purl?gro-2/78929"],["dc.language.iso","en"],["dc.notes.intern","DOI Import GROB-354"],["dc.title","Maize root and shoot litter quality controls short-term CO₂ and N₂O emissions and bacterial community structure of arable soil"],["dc.type","journal_article"],["dc.type.internalPublication","yes"],["dspace.entity.type","Publication"]]