Leaf cooling curves: measuring leaf temperatures in sunlight

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dc.contributor.author Leigh, A
dc.contributor.author Close, JD
dc.contributor.author Ball, MC
dc.contributor.author Siebke, K
dc.contributor.author Nicotra, A
dc.date.accessioned 2010-05-28T09:44:47Z
dc.date.issued 2006-01
dc.identifier.citation Functional Plant Biology, 2006, 33 (5), pp. 515 - 519
dc.identifier.issn 1445-4408
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/8677
dc.description.abstract Despite the obvious benefits of using thermography under field conditions, most infrared studies at the leaf level are generally conducted in the laboratory. One reason for this bias is that accuracy can potentially be compromised in sunlight because reflected radiation from the leaf might affect the calculation of the temperature measurement. We have developed a method for measuring leaf temperature in sunlight by using thermal imagery to generate cooling curves from which the time constant for cooling, ?, can be calculated. The original temperature of the sunlit leaf may be determined by extrapolating backwards in time. In the absence of specular reflection, there is close agreement between the extrapolated sunlit temperature and the sunlit temperature recorded by the camera. However, when reflected radiation is high, the difference between the initial (incorrect) temperature determined from the sunlit image and the temperature extrapolated from the cooling curve can be > 2°C. Notably, our results demonstrate a close agreement between the extrapolated sunlit temperature and the temperature of the leaf approximately 1 s after being shaded, suggesting that this shaded image provides a good estimate of the original sunlit temperature. Thus, our technique provides two means for measuring leaf surface temperature in sunlight
dc.publisher CSIRO
dc.relation.isbasedon 10.1071/FP05300
dc.title Leaf cooling curves: measuring leaf temperatures in sunlight
dc.type Journal Article
dc.parent Functional Plant Biology
dc.journal.volume 5
dc.journal.volume 33
dc.journal.number en_US
dc.journal.number 5 en_US
dc.publocation Collingwood, Australia en_US
dc.identifier.startpage 515 en_US
dc.identifier.endpage 519 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0602 Ecology
dc.personcode 102196
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
dc.description.keywords infrared imaging, reflected radiation, specular reflection, thermography, time constant
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 School of the Environment (ID: 344)
utslib.collection.history Closed (ID: 3)

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