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

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Show simple item record O'Grady, AP Eamus, D Hutley, LB 2011-02-07T06:21:37Z 1999
dc.identifier.citation Tree Physiology, 1999, 19 (9), pp. 591 - 597
dc.identifier.issn 0829-318X
dc.identifier.other C1UNSUBMIT en_US
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.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 SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0705 Forestry Sciences
dc.personcode 000006
dc.percentage 100 en_US Forestry Sciences 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 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
utslib.copyright.status Closed Access 2015-04-15 12:17:09.805752+10
pubs.consider-herdc false
utslib.collection.history Closed (ID: 3)
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history School of the Environment (ID: 344)

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