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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Show simple item record Macinnis-Ng, C Zeppel, M Williams, M Eamus, D 2012-10-12T03:33:31Z 2011-05
dc.identifier.citation Ecohydrology, 2011, 4 (3), pp. 379 - 393
dc.identifier.issn 1936-0584
dc.identifier.other C1 en_US
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. © 2010 John Wiley & Sons, Ltd.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1002/eco.138
dc.title Applying a SPA model to examine the impact of climate change on GPP of open woodlands and the potential for woody thickening
dc.type Journal Article
dc.parent Ecohydrology
dc.journal.volume 3
dc.journal.volume 4
dc.journal.number 3 en_US
dc.publocation UK en_US
dc.identifier.startpage 379 en_US
dc.identifier.endpage 393 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 060208 Terrestrial Ecology
dc.for 060705 Plant Physiology
dc.personcode 000006
dc.personcode 980151
dc.personcode 034078
dc.percentage 50 en_US Terrestrial Ecology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords Ecohydrology
dc.description.keywords SPA modelling
dc.description.keywords Woody thickening
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Faculty of Science/School of the Environment
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Open Access 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true

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