Vegetation composition modulates the interaction of climate warming and elevated nitrogen deposition on nitrous oxide flux in a boreal peatland
© 2021 John Wiley & Sons Ltd.
| Veröffentlicht in: | Global change biology. - 1999. - 27(2021), 21 vom: 26. Nov., Seite 5588-5598 |
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| Format: | Online-Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
2021
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| Zugriff auf das übergeordnete Werk: | Global change biology |
| Schlagworte: | Journal Article N deposition N2O global warming vegetation composition Soil Carbon Dioxide 142M471B3J Nitrous Oxide K50XQU1029 mehr... |
| Zusammenfassung: | © 2021 John Wiley & Sons Ltd. Northern peatlands with large organic nitrogen (N) storage have the potential to be N2 O hotspots under climate warming, elevated N deposition, and vegetation composition change caused by climate change. However, the interactions of these three factors and the primary controls on N2 O fluxes in peatlands are not well-known. Here, the three factors were manipulated in a boreal bog in western Newfoundland, Canada for 5 years. We found that warming mitigated the positive N effect on N2 O fluxes in the mid-growing season under intact vegetation owing to the increase of available N uptake by vegetation and less N for N2 O production. In contrast, warming strengthened the N effect on N2 O fluxes in the early growing season under the absence of graminoids or shrubs, which could be attributed to the increase of available carbon and nitrogen for N2 O production. It should be noted that these effects were not observed under the condition of low carbon availability. In addition, gross primary production was found as a critical control on N2 O fluxes under N addition. Our findings emphasize that the interaction of abiotic (warming and elevated nitrogen deposition) and biotic factors (vegetation composition change) on N2 O fluxes should be taken into account in order to project N2 O fluxes in peatland ecosystems accurately |
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| Beschreibung: | Date Completed 01.11.2021 Date Revised 01.11.2021 published: Print-Electronic Citation Status MEDLINE |
| ISSN: | 1365-2486 |
| DOI: | 10.1111/gcb.15865 |