Mechanisms linking plant productivity and water status for a temperate Eucalyptus forest flux site: Analysis over wet and dry years with a simple model

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Show simple item record Pepper, DA McMurtrie, RE Medlyn, BE Keith, H Eamus, D 2010-07-15T07:26:55Z 2008
dc.identifier.citation Functional Plant Biology, 2008, 35 (6), pp. 493 - 508
dc.identifier.issn 1445-4408
dc.identifier.other C1 en_US
dc.description.abstract A simple process-based model was applied to a tall Eucalyptus forest site over consecutive wet and dry years to examine the importance of different mechanisms linking productivity and water availability. Measured soil moisture, gas flux (CO2, H2O) and meteorological records for the site were used. Similar levels of simulated H2O flux in 'wet' and 'dry' years were achieved when water availability was not confined to the first 1.20 m of the soil profile, but was allowed to exceed it. Although the simulated effects of low soil and atmospheric water content on CO2 flux, presumably via reduction in stomatal aperture, also acted on transpiration, they were offset in the dry year by a higher vapour-pressure deficit. A sensitivity analysis identified the processes that were important in wet versus dry years, and on an intra-annual timeframe. Light-limited productivity dominated in both years, except for the driest period in the dry year. Vapour-pressure deficit affected productivity across more of each year than soil moisture, but both effects were larger in the dry year. The introduction of a reduced leaf area tended to decrease sensitivity in the dry year. Plant hydraulic architecture that increases plant available water, maximises productivity per unit water use and achieves lower sensitivity to low soil moisture levels should minimise production losses during dry conditions. © CSIRO 2008.
dc.language eng
dc.relation.isbasedon 10.1071/FP08125
dc.title Mechanisms linking plant productivity and water status for a temperate Eucalyptus forest flux site: Analysis over wet and dry years with a simple model
dc.type Journal Article
dc.parent Functional Plant Biology
dc.journal.volume 6
dc.journal.volume 35
dc.journal.number 6 en_US
dc.publocation Collingwood en_US
dc.identifier.startpage 493 en_US
dc.identifier.endpage 508 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0607 Plant Biology
dc.personcode 000006
dc.percentage 100 en_US Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity ISI:000258134900007 en_US
dc.location.activity ISI:000289047700063
dc.description.keywords CO2
dc.description.keywords Drought
dc.description.keywords Evapotranspiration
dc.description.keywords Flux
dc.description.keywords Water flux
dc.description.keywords Water use
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc true
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of the Environment (ID: 344)

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