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Published (Version of record)CC BY V4.0, Open Access
Published (Version of record)CC BY V4.0, Open
Journal article
Pristine mangrove creek waters are a sink of nitrous oxide
Scientific Reports, Vol.6(1), pp.1-8
12/05/2016
PMCID: PMC4864614
PMID: 27172603
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Abstract
Nitrous oxide (N2O) is an important greenhouse gas, but large uncertainties remain in global budgets. Mangroves are thought to be a source of N2O to the atmosphere in spite of the limited available data. Here we report high resolution time series observations in pristine Australian mangroves along a broad latitudinal gradient to assess the potential role of mangroves in global N2O budgets. Surprisingly, five out of six creeks were under-saturated in dissolved N2O, demonstrating mangrove creek waters were a sink for atmospheric N2O. Air-water flux estimates showed an uptake of 1.52 ± 0.17 μmol m(-2) d(-1), while an independent mass balance revealed an average sink of 1.05 ± 0.59 μmol m(-2) d(-1). If these results can be upscaled to the global mangrove area, the N2O sink (~2.0 × 10(8) mol yr(-1)) would offset ~6% of the estimated global riverine N2O source. Our observations contrast previous estimates based on soil fluxes or mangrove waters influenced by upstream freshwater inputs. We suggest that the lack of available nitrogen in pristine mangroves favours N2O consumption. Widespread and growing coastal eutrophication may change mangrove waters from a sink to a source of N2O to the atmosphere, representing a positive feedback to climate change.
Details
- Title
- Pristine mangrove creek waters are a sink of nitrous oxide
- Creators
- Damien T Maher - Southern Cross UniversityJames Z Sippo - Southern Cross UniversityDouglas R Tait - Southern Cross UniversityCeylena Holloway - Southern Cross UniversityIsaac R Santos - Southern Cross University
- Publication Details
- Scientific Reports, Vol.6(1), pp.1-8
- Publisher
- Nature Publishing Group; England
- Number of pages
- 8
- Grant note
- DE140101733; DE150100581; LE140100083 / Australian Research Council (ARC)
- Identifiers
- 991012925439602368
- Copyright
- This work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/
- Academic Unit
- Science; National Marine Science Centre; Faculty of Science and Engineering
- Language
- English
- Resource Type
- Journal article