Transpiration increases during the dry season: Patterns of tree water use in eucalypt open-forests of northern Australia

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dc.contributor.author O'Grady, AP
dc.contributor.author Eamus, D
dc.contributor.author Hutley, LB
dc.date.accessioned 2011-02-07T06:21:37Z
dc.date.issued 1999
dc.identifier.citation Tree Physiology, 1999, 19 (9), pp. 591 - 597
dc.identifier.issn 0829-318X
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13429
dc.description.abstract Australian savannas exhibit marked seasonality in precipitation, with more than 90% of the annual total falling between October and May. The dry season is characterized by declining soil water availability and high vapor pressure deficits (up to 2.5 kPa). We used heat pulse technology to measure whole-tree transpiration rates on a daily and seasonal basis for the two dominant eucalypts at a site near Darwin, Australia. Contrary to expectations, transpiration rates were higher during the dry season than during the wet season, largely because of increased evaporative demand and the exploitation of groundwater reserves by the trees. Transpiration rates exhibited a marked hysteresis in relation to vapor pressure deficit, which was more marked in the dry season than in the wet season. This result may be attributable to low soil hydraulic conductivity, or the use of stored stem water, or both. Tree water use was strongly correlated with leaf area and diameter at breast height and there were no differences in transpiration between the species studied. These results are discussed in relation to scaling tree water use to stand water use.
dc.language eng
dc.publisher Heron Publishing
dc.subject Australian savannas, Eucalyptus miniata, Eucalyptus tetrodonta, Sapflow, Vapor pressure deficit, Australian savannas, Eucalyptus miniata, Eucalyptus tetrodonta, sapflow, vapor pressure deficit, Sap Flow, Stomatal Conductance, Carbon Assimilation, Tropical Savanna, Leaf Phenology, Woodland, Evaporation, Rainfall, Darwin, Scale, Plant Biology & Botany
dc.subject Australian savannas; Eucalyptus miniata; Eucalyptus tetrodonta; Sapflow; Vapor pressure deficit; Australian savannas; Eucalyptus miniata; Eucalyptus tetrodonta; sapflow; vapor pressure deficit; Sap Flow; Stomatal Conductance; Carbon Assimilation; Tropical Savanna; Leaf Phenology; Woodland; Evaporation; Rainfall; Darwin; Scale; Plant Biology & Botany
dc.title Transpiration increases during the dry season: Patterns of tree water use in eucalypt open-forests of northern Australia
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 9
dc.journal.volume 19
dc.journal.number 9 en_US
dc.publocation Victoria en_US
dc.identifier.startpage 591 en_US
dc.identifier.endpage 597 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0705 Forestry Sciences
dc.personcode 0000024179 en_US
dc.personcode 000006 en_US
dc.personcode 0000018330 en_US
dc.percentage 100 en_US
dc.classification.name Forestry Sciences 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 Sap Flow; Stomatal Conductance; Carbon Assimilation; Tropical Savanna; Leaf Phenology; Woodland; Evaporation; Rainfall; Darwin; Scale en_US
dc.description.keywords NA
dc.description.keywords Australian savannas
dc.description.keywords Eucalyptus miniata
dc.description.keywords Eucalyptus tetrodonta
dc.description.keywords Sapflow
dc.description.keywords Vapor pressure deficit
dc.description.keywords Australian savannas
dc.description.keywords Eucalyptus miniata
dc.description.keywords Eucalyptus tetrodonta
dc.description.keywords Sapflow
dc.description.keywords Vapor pressure deficit
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


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