Applying a SPA model to examine the impact of climate change on GPP of open woodlands and the potential for woody thickening

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dc.contributor.author Macinnis-Ng, Catriona en_US
dc.contributor.author Zeppel, Melanie en_US
dc.contributor.author Williams, Mathew en_US
dc.contributor.author Eamus, Derek en_US
dc.contributor.editor en_US
dc.date.accessioned 2012-10-12T03:33:31Z
dc.date.available 2012-10-12T03:33:31Z
dc.date.issued 2011 en_US
dc.identifier 2010001541 en_US
dc.identifier.citation Macinnis-Ng Catriona et al. 2011, 'Applying a SPA model to examine the impact of climate change on GPP of open woodlands and the potential for woody thickening', Wiley Interscience, vol. 4, no. 3, pp. 379-393. en_US
dc.identifier.issn 1936-0584 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/18188
dc.description.abstract Woody thickening is a global phenomenon that influences landscape C density, regional ecohydrology and biogeochemical cycling. The aim of the work described here is to test the hypothesis that increased atmospheric CO2 concentration, with or without photosynthetic acclimation, can increase gross primary production (GPP) and that this can explain woody thickening. We examine mechanisms underlying the response of GPP and highlight the importance of changes in soil water content by applying a detailed soil-plant-atmosphere model. Through this model, we show that CO2 enrichment with decreased or increased D and photosynthetic acclimation results in decreased canopy water use because of reduced gs. The decline in water use coupled with increased photosynthesis resulted in increased GPP, water-use efficiency and soil moisture content. This study shows that this is a valid mechanism for GPP increase because of CO2 enrichment coupled with either a decrease or an increase in D, in water-limited environments. We also show that a large increase in leaf area index could be sustained in the future as a result of the increased soil moisture content arising from CO2 enrichment and this increase was larger if D decreases rather than increases in the future. Large-scale predictions arising from this simple conceptual model are discussed and found to be supported in the literature. We conclude that woody thickening in Australia and probably globally can be explained by the changes in landscape GPP and soil moisture balance arising principally from the increased atmospheric CO2 concentration. en_US
dc.language en_US
dc.publisher Wiley Interscience en_US
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon http://dx.doi.org/10.1002/eco.138 en_US
dc.title Applying a SPA model to examine the impact of climate change on GPP of open woodlands and the potential for woody thickening en_US
dc.parent Ecohydrology en_US
dc.journal.volume 4 en_US
dc.journal.number 3 en_US
dc.publocation UK en_US
dc.identifier.startpage 379 en_US
dc.identifier.endpage 393 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060208 en_US
dc.personcode 980151 en_US
dc.personcode 034078 en_US
dc.personcode 0000020564 en_US
dc.personcode 000006 en_US
dc.percentage 50 en_US
dc.classification.name Terrestrial Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.location.activity en_US
dc.description.keywords SPA modelling; woody thickening; ecohydrology en_US
dc.staffid 000006 en_US


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