A comparison of tree water use in two contiguous vegetation communities of the seasonally dry tropics of northern Australia: The importance of site water budget to tree hydraulics

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dc.contributor.author Kelley, G
dc.contributor.author O'Grady, AP
dc.contributor.author Hutley, LB
dc.contributor.author Eamus, D
dc.date.accessioned 2010-05-28T09:45:12Z
dc.date.issued 2007
dc.identifier.citation Australian Journal of Botany, 2007, 55 (7), pp. 700 - 708
dc.identifier.issn 0067-1924
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/8745
dc.description.abstract Tree water use in two contiguous communities (eucalypt open-forest and Melaleuca paperbark forest) was measured in tropical Australia, over a 2-year period. The aims of the study were to (1) quantify daily and seasonal patterns of water use in each community, (2) compare patterns of water use among the communities and (3) compare relationships among tree size, sapwood area and water use within the two contrasting vegetation communities. Access to deep soil water stores and the effect of run-on from the eucalypt forest resulted in a relatively high pre-dawn water potential throughout the year, particularly for Melaleuca forest. There were no differences in daily rates of water use, expressed on a sapwood area (Qs) basis, between the two eucalypt species examined (Eucalyptus miniata Cunn. Ex Schauer and E. tetrodonta F.Muell) at any time in the eucalypt forest. For both the eucalypt and Melaleuca forests, there was less seasonal variation in water use expressed on a leaf area (Q l) basis than on a Q s basis, and neither year nor season were significant factors in Q l. In the mono-specific Melaleuca forest, Q s was not significantly different between years or seasons. Water use on a Q l basis was similarly not significantly different between years or seasons in the Melaleuca forest. Leaf area index (LAI) of the eucalypt forest was about half of that of the Melaleuca forest throughout the year but sapwood area per hectare was 33% larger in the eucalypt than the Melaleuca forest, despite the basal area of the Melaeuca forest being almost double that of the eucalypt forest. There was no significant difference in stand water use (mm day-1) between eucalypt and Melaleuca forests during 1998; however, in 1999 Melaleuca stand water use was larger than that of the eucalypt forest. Because of the enhanced dry-season availability of water in the Melaleuca forest and its larger LAI, average annual water use of the Melaleuca forest was almost 60% larger than that of the eucalypt forest. Despite differences in Q l, Q s and annual water use between forests, the ratio of LAI to stand water use was similar for all seasons in both forests. The applicability of 'universal rules' linking tree water use and tree hydraulics and the importance of ecosystem location on site water budgets and plant adaptations are discussed. © CSIRO 2007.
dc.language eng
dc.relation.isbasedon 10.1071/BT07021
dc.title A comparison of tree water use in two contiguous vegetation communities of the seasonally dry tropics of northern Australia: The importance of site water budget to tree hydraulics
dc.type Journal Article
dc.parent Australian Journal of Botany
dc.journal.volume 7
dc.journal.volume 55
dc.journal.number 7 en_US
dc.publocation Melbourne, Australia en_US
dc.identifier.startpage 700 en_US
dc.identifier.endpage 708 en_US
dc.cauo.name 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
dc.classification.name Plant Biology 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
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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