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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)orcid 
Publication Date: 2008-05
Early Online Version: 2008-01-31
DOI: 10.1111/j.1365-2486.2008.01558.x
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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
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: 1354-1013
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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