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https://hdl.handle.net/1959.11/22352
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); Newton, Paul C D (author); Osanai, Yui (author) | Publication Date: | 2017 | DOI: | 10.1007/s11104-017-3474-8 | Handle Link: | https://hdl.handle.net/1959.11/22352 | 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 | Source of Publication: | Plant and Soil, 421(1-2), p. 417-428 | Publisher: | Springer Netherlands | Place of Publication: | Netherlands | ISSN: | 1573-5036 0032-079X |
Fields of Research (FoR) 2008: | 050102 Ecosystem Function 050101 Ecological Impacts of Climate Change 050304 Soil Chemistry (excl. Carbon Sequestration Science) |
Fields of Research (FoR) 2020: | 410203 Ecosystem function 410102 Ecological impacts of climate change and ecological adaptation 410604 Soil chemistry and soil carbon sequestration (excl. carbon sequestration science) |
Socio-Economic Objective (SEO) 2008: | 961406 Sparseland, Permanent Grassland and Arid Zone Soils 960303 Climate Change Models 960307 Effects of Climate Change and Variability on Australia (excl. Social Impacts) |
Socio-Economic Objective (SEO) 2020: | 180605 Soils 190501 Climate change models 190504 Effects of climate change on Australia (excl. social impacts) |
Peer Reviewed: | Yes | HERDC Category Description: | C1 Refereed Article in a Scholarly Journal |
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Appears in Collections: | Journal Article School of Environmental and Rural Science |
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