Comparative water use by the riparian trees Melaleuca argentea and Corymbia bella in the wet-dry tropics of northern Australia

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Show simple item record O'Grady, AP Eamus, D Cook, PG Lamontagne, S 2009-12-21T02:30:50Z 2006-02
dc.identifier.citation Tree Physiology, 2006, 26 (2), pp. 219 - 228
dc.identifier.issn 0829-318X
dc.identifier.other C1 en_US
dc.description.abstract We examined sources of water and daily and seasonal water use patterns in two riparian tree species occupying contrasting niches within riparian zones throughout the wet-dry tropics of northern Australia: Corymbia bella Hill and Johnson is found along the top of the levee banks and Melaleuca argentea W. Fitzg. is restricted to riversides. Patterns of tree water use (sap flow) and leaf water potential were examined in four trees of each species at three locations along the Daly River in the Northern Territory. Predawn leaf water potential was higher than -0.5 MPa throughout the dry season in both species, but was lower at the end of the dry season than at the beginning of the dry season. Contrary to expectations, predawn leaf water potential was lower in M. argentea trees along the river than in C. bella trees along the levees. In contrast, mid-day leaf water potential was lower in the C. bella trees than in M. argentea trees. There were no seasonal differences in tree water use in either species. Daily water use was lower in M. argentea trees than in C. bella trees. Whole-tree hydraulic conductance, estimated from the slope of the relationship between leaf water potential and sap flow, did not differ between species. Xylem deuterium concentrations indicated that M. argentea trees along the riverbank were principally reliant on river water or shallow groundwater, whereas C. bella trees along the levee were reliant solely on soil water reserves. This study demonstrated strong gradients of tree water use within tropical riparian communities, with implications for estimating riparian water use requirements and for the management of groundwater resources. © 2006 Heron Publishing.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.title Comparative water use by the riparian trees Melaleuca argentea and Corymbia bella in the wet-dry tropics of northern Australia
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 2
dc.journal.volume 26
dc.journal.number 2 en_US
dc.publocation Victoria, Canada en_US
dc.publocation Hershey, PA & London, UK
dc.identifier.startpage 219 en_US
dc.identifier.endpage 228 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 1
dc.description.keywords Groundwater
dc.description.keywords Hydraulic conductance
dc.description.keywords Leaf water potential
dc.description.keywords Sap flow
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 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history General (ID: 2)
utslib.collection.history School of the Environment (ID: 344)

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