Journal article
(super 15) N additions for evaluating nitrogen biogeochemical cycles in aquatic systems; four case studies: 15N additions for evaluating nitrogen biogeochemical cycles in aquatic systems
V.M. Goldschmidt Conference - Program and Abstracts, Vol.27, pp.1-1
Goldschmidt 2017
2017
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Abstract
15N tracer studies are a powerful tool for evaluating nitrogen biogeochemical cycles. Deliberate additions of 15N overcome some of the limitations of natural abundance stable isotope studies such as overlapping source signals, variable and/or uncertain fractionation factors and spatial and temporal variation. This presentation will compare and contrast the nitrogen assimilation, trophic transfer, transformation, and/or flux pathways within four different aquatic systems that we have studied using 15N tracers. Most of the 15N added to a mangrove forest during a whole-ecosystem stable isotope addition was retained after 14 days (70%), with the remaining 15N exported as PON, NH4+, NO3- and N2 (decreasing order of importance). A similar amount of 15N was retained in a constructed wetland during a whole-ecosystem stable isotope addition after 15 days (80%), but more of the remaining 15N was lost via N2 effluxes. In contrast, only 27% of the 15N that was assimilated by MPB in subtidal sands was retained after 33 days, with 16.5% effluxed as NO3-, 20.8% effluxed as NH4+, and 20.7%
effluxed as N2 and 15.1% was missing.
Details
- Title
- (super 15) N additions for evaluating nitrogen biogeochemical cycles in aquatic systems; four case studies: 15N additions for evaluating nitrogen biogeochemical cycles in aquatic systems
- Creators
- B D Eyre - Southern Cross UniversityD Erler - Southern Cross UniversityJ Oakes - Southern Cross University
- Publication Details
- V.M. Goldschmidt Conference - Program and Abstracts, Vol.27, pp.1-1
- Conference
- Goldschmidt 2017
- Publisher
- Goldschmidt Conference
- Identifiers
- 991012978868902368
- Academic Unit
- Centre for Coastal Biogeochemistry; Faculty of Science and Engineering; Science
- Language
- English
- Resource Type
- Journal article