Topographical and seasonal trends in transpiration by two co-occurring Eucalyptus species during two contrasting years in a low rainfall environment

DSpace/Manakin Repository

Search OPUS

Advanced Search


My Account

Show simple item record Yunusa, IAM Aumann, CD Rab, MA Merrick, N Fisher, PD Eberbach, PL Eamus, D 2011-02-07T06:21:44Z 2010-08
dc.identifier.citation Agricultural and Forest Meteorology, 2010, 150 (9), pp. 1234 - 1244
dc.identifier.issn 0168-1923
dc.identifier.other C1 en_US
dc.description.abstract Understanding the strategies that confer resilience on natural woodlands in drought prone environments is important for the conservation of these and similar ecosystems. Our main aim in this 2-year study was to assess traits (sapwood area, sapwood density and leaf area index) that control transpiration in Eucalyptus camaldulensis and E. microcarpa in a natural forest in which topographical variation created surface soils of sandy clay in a depression (clay-zone) and of loamy sand underlain by a dense profile on the terraces (sand-zone). The clay-zone had a wetter profile due to extra water supply through subsurface lateral flow from the adjoining, topographically higher, sand-zone. In the clay-zone, the differences between the two tree species in their hydraulic attributes were large and rates of water use were widely divergent. Rates of transpiration per unit land area (Ec) and canopy conductance of E. camaldulensis that was dominant in the clay-zone were about 50% lower than those for E. microcarpa in the same zone. This was in marked contrast to the behavior of trees growing in the sand-zone where water availability was persistently low and variations in sapwood density, sapwood area and canopy conductance were narrow. This resulted in almost identical rates of water use for the two species in the sand-zone, despite E. microcarpa dominating the stand. Contrary to many previous studies, sapwood density was positively correlated with Ec in these eucalypt species, while the proportion of trunk area assigned to sapwood declined with sapwood density. Consequently in this low rainfall environment, with prolonged dry seasons, dense sapwood safeguards against turgor loss, and possibly xylem embolism, thereby allowing Ec to be sustained under extremely low soil-water availability. We concluded that variation in hydraulic traits is less likely where trees are under persistent water-stress than where the stress is short and relatively mild. We developed single functions for predicting Ec for the two species by integrating their responses to micrometeorological and soil-water conditions. © 2010.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1016/j.agrformet.2010.05.007
dc.title Topographical and seasonal trends in transpiration by two co-occurring Eucalyptus species during two contrasting years in a low rainfall environment
dc.type Journal Article
dc.parent Agricultural and Forest Meteorology
dc.journal.volume 9
dc.journal.volume 150
dc.journal.number 9 en_US
dc.publocation Amsterdam, The Netherlands en_US
dc.publocation The Netherlands
dc.identifier.startpage 1234 en_US
dc.identifier.endpage 1244 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.conference Australasian Conference on the Mechanics of Structures and Materials
dc.for 0607 Plant Biology
dc.for 0602 Ecology
dc.personcode 000006
dc.personcode 030005
dc.personcode 921005
dc.percentage 50 en_US Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US 2010-12-07
dc.location.activity ISI:000280943100009 en_US
dc.location.activity Melbourne, Australia
dc.description.keywords Drought
dc.description.keywords Eucalypts
dc.description.keywords Lateral flow
dc.description.keywords Ponding
dc.description.keywords Sapwood area
dc.description.keywords Sapwood density
dc.description.keywords Soil-water
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 Engineering and Information Technology
pubs.organisational-group /University of Technology Sydney/Faculty of Engineering and Information Technology/School of Elec, Mech and Mechatronic Systems
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Open Access 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history General (ID: 2)

Files in this item

This item appears in the following Collection(s)

Show simple item record