Dry season conditions determine wet season water use in the wet-dry tropical savannas of northern Australia

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dc.contributor.author Eamus, D
dc.contributor.author O'Grady, AP
dc.contributor.author Hutley, L
dc.date.accessioned 2011-02-07T06:21:39Z
dc.date.issued 2000
dc.identifier.citation Tree Physiology, 2000, 20 (18), pp. 1219 - 1226
dc.identifier.issn 0829-318X
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/13432
dc.description.abstract Daily and seasonal patterns of transpiration were measured in evergreen eucalypt trees growing at a wet (Darwin), intermediate (Katherine) and dry site (Newcastle Waters) along a steep rainfall gradient in a north Australian savanna. Relationships between tree size and tree water use were also determined. Diameter at breast height (DBH) was an excellent predictor of sapwood area in the five eucalypt species sampled along the rainfall gradient. A single relationship existed for all species at all sites. Mean daily water use was also correlated to DBH in both wet and dry seasons. There were no significant differences in the relationship between DBH and tree water use at Darwin or Katherine. Among the sites, tree water use was lowest at Newcastle Waters at all DBHs. The relationship between DBH and tree leaf area was similar between species and locations, but the slope of the relationship was less at the end of the dry season than at the end of the wet season at all locations. There was a strong relationship between sapwood area and leaf area that was similar at all sites along the gradient. Transpiration rates were significantly lower in trees at the driest site than at the other sites, but there were no significant differences in transpiration rates between trees growing at Darwin and Katherine. Transpiration rates did not vary significantly between seasons at any site. At all sites, there was only a 10% decline in water use per tree between the wet and dry seasons. A monthly aridity index (pan evaporation/rainfall) and predawn leaf water potential showed strong seasonal patterns. It is proposed that dry season conditions exert control on tree water use during the wet season, possibly through an effect on xylem structure.
dc.language eng
dc.title Dry season conditions determine wet season water use in the wet-dry tropical savannas of northern Australia
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 18
dc.journal.volume 20
dc.journal.number 18 en_US
dc.publocation Victoria en_US
dc.identifier.startpage 1219 en_US
dc.identifier.endpage 1226 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0705 Forestry Sciences
dc.personcode 000006
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 Eucalyptus
dc.description.keywords Hydraulic architecture
dc.description.keywords Rainfall gradient
dc.description.keywords Sapwood area
dc.description.keywords Stem diameter
dc.description.keywords Transpiration
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
utslib.copyright.date 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)

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