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N2O concentration and isotope signature along profiles provide deeper insight into the fate of N2O in soils

Title data

Goldberg, Stefanie ; Knorr, Klaus-Holger ; Gebauer, Gerhard:
N2O concentration and isotope signature along profiles provide deeper insight into the fate of N2O in soils.
In: Isotopes in Environmental and Health Studies. Vol. 44 (2008) Issue 4 . - pp. 377-391.
ISSN 1477-2639
DOI: https://doi.org/10.1080/10256010802507433

Abstract in another language

Nitrous oxide is an important greenhouse gas and its origin and fate are thus of broad interest. Moststudies on emissions of nitrous oxide from soils focused on fluxes between soil and atmosphere and hencerepresent an integration of physical and biological processes at different depths of a soil profile. Analysisof N2O concentration and isotope signature along soil profiles was suggested to improve the localisationof sources and sinks in soils as well as underlying processes and could therefore extend our knowledge onprocesses affecting surface N2O fluxes. Such a mechanistic understanding would be desirable to improveN2O mitigation strategies and global N2O budgets.To investigate N2O dynamics within soil profiles of two contrasting (semi)natural ecosystem types (atemperate acidic fen and a Norway spruce forest), soil gas samplers were constructed to meet the differentrequirements of a water-saturated and an unsaturated soil, respectively. The samplers were installed inthree replicates and allowed soil gas sampling from six different soil depths. We analysed soil air for N2Oconcentration and isotope composition and calculated N2O net turnover using a mass balance approachand considering diffusive fluxes.At the fen site, N2O was mainly produced in 30–50 cm soil depth. Diffusion to adjacent layers aboveand below indicated N2O consumption. Values of δ15N and δ18O of N2O in the fen soil were alwayslinearly correlated and their qualitative changes within the profile corresponded with the calculated turnoverprocesses, suggesting further reduction of N2O. In the spruce forest, highest N2O production occurred in thetopsoil, but there was also notable production occurring in the subsoil at a depth of 70 cm. Changes in N2Oisotope composition as to be expected from local production and consumption processes within the soilprofile did hardly occur, though. This was presumably caused by high diffusive fluxes and comparativelylow net turnover, as isotope signatures approached values measured for ambient N2O towards the topsoil.Our results demonstrate a highly variable influence of diffusive versus production/consumption processeson N2O concentration and isotope composition, depending on the type of ecosystem. This finding indicatesthe necessity of further N2O concentration and isotope profile investigations in different types of naturaland anthropogenic ecosystems in order to generalise our mechanistic understanding of N2O exchangebetween soil and atmosphere.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER63783
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Hydrology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Research Institutions > Research Units > Limnological Research Station
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Units
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 15 May 2015 14:47
Last Modified: 15 May 2015 14:47
URI: https://eref.uni-bayreuth.de/id/eprint/13733