Whole-tree chambers for elevated atmospheric CO2 experimentation and tree scale flux measurements in south-eastern Australia: The Hawkesbury Forest Experiment

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dc.contributor.author Barton, CVM
dc.contributor.author Ellsworth, DS
dc.contributor.author Medlyn, BE
dc.contributor.author Duursma, RA
dc.contributor.author Tissue, DT
dc.contributor.author Adams, MA
dc.contributor.author Eamus, D
dc.contributor.author Conroy, JP
dc.contributor.author McMurtrie, RE
dc.contributor.author Parsby, J
dc.contributor.author Linder, S
dc.date.accessioned 2011-02-07T06:21:40Z
dc.date.issued 2010-07
dc.identifier.citation Agricultural and Forest Meteorology, 2010, 150 (7-8), pp. 941 - 951
dc.identifier.issn 0168-1923
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/13435
dc.description.abstract Resolving ecophysiological processes in elevated atmospheric CO2 (Ca) at scales larger than single leaves poses significant challenges. Here, we describe a field-based experimental system designed to grow trees up to 9m tall in elevated Ca with the capacity to control air temperature and simultaneously measure whole-tree gas exchange. In western Sydney, Australia, we established the Hawkesbury Forest Experiment (HFE) where we built whole-tree chambers (WTC) to measure whole-tree CO2 and water fluxes of an evergreen broadleaf tree, Eucalyptus saligna. A single E. saligna tree was grown from seedling to small tree within each of 12 WTCs; six WTCs were maintained at ambient Ca and six WTCs were maintained at elevated Ca, targeted at ambient Ca +240μmolmol-1. All 12 WTCs were controlled to track ambient outside air temperature (Tair) and air water vapour deficit (Dair). During the experimental period, Tair, Dair and Ca in the WTCs were within 0.5°C, 0.3kPa, and 15μmolmol-1 of the set-points for 90% of the time, respectively. Diurnal responses of whole-tree CO2 and water vapour fluxes are analysed, demonstrating the ability of the tree chamber system to measure rapid environmental responses of these fluxes of entire trees. The light response of CO2 uptake for entire trees showed a clear diurnal hysteresis, attributed to stomatal closure at high Dair. Tree scale CO2 fluxes confirm the hypothesised deleterious effect of chilling night-time temperatures on whole-tree carbon gain in this subtropical Eucalyptus. The whole-tree chamber flux data add an invaluable scale to measurements in both ambient and elevated Ca and allow us to elucidate the mechanisms driving tree productivity responses to elevated Ca in interaction with water availability and temperature. © 2010 Elsevier B.V.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1016/j.agrformet.2010.03.001
dc.title Whole-tree chambers for elevated atmospheric CO2 experimentation and tree scale flux measurements in south-eastern Australia: The Hawkesbury Forest Experiment
dc.type Journal Article
dc.parent Agricultural and Forest Meteorology
dc.journal.volume 7-8
dc.journal.volume 150
dc.journal.number 7-8 en_US
dc.publocation Amsterdam, The Netherlands en_US
dc.identifier.startpage 941 en_US
dc.identifier.endpage 951 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.for 0502 Environmental Science and Management
dc.personcode 000006
dc.percentage 33 en_US
dc.classification.name Ecology 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 ISI:000280077500008 en_US
dc.description.keywords Carbon dioxide assimilation
dc.description.keywords Carbon dioxide enrichment
dc.description.keywords Eucalyptus saligna
dc.description.keywords Tree photosynthesis
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 Open Access
utslib.copyright.date 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)

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