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https://hdl.handle.net/1959.11/27139
Title: | Warming prevents the elevated CO₂-induced reduction in available soil nitrogen in a temperate, perennial grassland | Contributor(s): | Hovenden, Mark J (author); Newton, P C D (author); Carran, R A (author); Theobald, P (author); Wills, K E (author); Vander Schoor, J K (author); Williams, A L (author); Osanai, Y (author) | Publication Date: | 2008-05 | Early Online Version: | 2008-01-31 | DOI: | 10.1111/j.1365-2486.2008.01558.x | Handle Link: | https://hdl.handle.net/1959.11/27139 | Abstract: | Rising atmospheric carbon dioxide concentration ([CO₂]) has the potential to stimulate ecosystem productivity and sink strength, reducing the effects of carbon (C) emissions on climate. In terrestrial ecosystems, increasing [CO₂] can reduce soil nitrogen (N) availability to plants, preventing the stimulation of ecosystem C assimilation; a process known as progressive N limitation. Using ion exchange membranes to assess the availability of dissolved organic N, ammonium and nitrate, we found that CO₂ enrichment in an Australian, temperate, perennial grassland did not increase plant productivity, but did reduce soil N availability, mostly by reducing nitrate availability. Importantly, the addition of 2 °C warming prevented this effect while warming without CO₂ enrichment did not significantly affect N availability. These findings indicate that warming could play an important role in the impact of [CO₂] on ecosystem N cycling, potentially overturning CO₂‐induced effects in some ecosystems. | Publication Type: | Journal Article | Grant Details: | ARC/DP0984779 | Source of Publication: | Global Change Biology, 14(5), p. 1018-1024 | Publisher: | Wiley-Blackwell Publishing Ltd | Place of Publication: | United Kingdom | ISSN: | 1365-2486 1354-1013 |
Fields of Research (FoR) 2008: | 069902 Global Change Biology 050101 Ecological Impacts of Climate Change 060202 Community Ecology (excl. Invasive Species Ecology) |
Socio-Economic Objective (SEO) 2008: | 960301 Climate Change Adaptation Measures 960811 Sparseland, Permanent Grassland and Arid Zone Flora, Fauna and Biodiversity 960305 Ecosystem Adaptation to Climate Change |
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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