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Title: Warming has a larger and more persistent effect than elevated CO₂ on growing season soil nitrogen availability in a species-rich grassland
Contributor(s): Hovenden, Mark J  (author)orcid ; Newton, Paul C D (author); Osanai, Yui  (author)orcid 
Publication Date: 2017-12
Early Online Version: 2017-10-28
DOI: 10.1007/s11104-017-3474-8
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Abstract: Background and aims: The terrestrial biosphere’s ability to capture carbon is dependent upon soil nitrogen (N) availability, which might reduce as CO₂ increases, but global warming has the potential to offset CO₂ effects. Here we examine the interactive impact of elevated CO₂ (eCO₂) and warming on soil N availability and transformations in a low-fertility native grassland in Tasmania, Australia. Methods: Using ion exchange membranes, we examined soil nitrogen availability during the growing season from 2004 to 2010 in the TasFACE experiment. We also estimated soil N transformation rates using laboratory incubations. Results: Soil N availability varied strongly over time but was more than doubled by experimental warming of 2°C, an impact that was consistent from the fifth year of the experiment to its conclusion. Elevated CO₂ reduced soil N availability by ~28%, although this varied strongly over time. Treatment effects on potential N mineralisation also varied strongly from year to year but tended to be reduced by eCO₂ and increased by warming. Conclusions: These results suggest that warming should increase soil N availability more strongly than it is suppressed by eCO₂ in low fertility grasslands such as this, stimulating terrestrial carbon sinks by preventing eCO₂-induced nitrogen limitation of primary productivity.
Publication Type: Journal Article
Grant Details: ARC/DP0984779
Source of Publication: Plant and Soil, 421(1-2), p. 417-428
Publisher: Springer Netherlands
Place of Publication: The Netherlands
ISSN: 0032-079X
Field of Research (FOR): 050303 Soil Biology
060503 Microbial Genetics
069902 Global Change Biology
Peer Reviewed: Yes
HERDC Category Description: C1 Refereed Article in a Scholarly Journal
Appears in Collections:Journal Article
School of Environmental and Rural Science

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