Rates of nocturnal transpiration in two evergreen temperate woodland species with differing water-use strategies

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dc.contributor.author Zeppel, M
dc.contributor.author Tissue, D
dc.contributor.author Taylor, D
dc.contributor.author MacInnis-Ng, C
dc.contributor.author Eamus, D
dc.date.accessioned 2011-02-07T06:21:41Z
dc.date.issued 2010-08
dc.identifier.citation Tree Physiology, 2010, 30 (8), pp. 988 - 1000
dc.identifier.issn 0829-318X
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/13437
dc.description.abstract Nocturnal fluxes may be a significant factor in the annual water budget of forested ecosystems. Here, we assessed sap flow in two co-occurring evergreen species (Eucalyptus parramattensis and Angophora bakeri) in a temperate woodland for 2 years in order to quantify the magnitude of seasonal nocturnal sap flow (En) under different environmental conditions. The two species showed different diurnal water relations, demonstrated by different diurnal curves of stomatal conductance, sap flow and leaf water potential. The relative influence of several microclimatic variables, including wind speed (U), vapour pressure deficit (D), the product of U and D (UD) and soil moisture content, were quantified. D exerted the strongest influence on En (r2 = 0.59-0.86), soil moisture content influenced En when D was constant, but U and UD did not generally influence En. In both species, cuticular conductance (Gc) was a small proportion of total leaf conductance (Gs) and was not a major pathway for En. We found that En was primarily a function of transpiration from the canopy rather than refilling of stem storage, with canopy transpiration accounting for 50-70% of nocturnal flows. Mean En was 6-8% of the 24-h flux across seasons (spring, summer and winter), but was up to 19% of the 24-h flux on some days in both species. Despite different daytime strategies in water use of the two species, both species demonstrated low night-time water loss, suggesting similar controls on water loss at night. In order to account for the impact of En on pre-dawn leaf water potential arising from the influence of disequilibria between root zone and leaf water potential, we also developed a simple model to more accurately predict soil water potential (ψs). © The Author 2010. Published by Oxford University Press. All rights reserved.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1093/treephys/tpq053
dc.title Rates of nocturnal transpiration in two evergreen temperate woodland species with differing water-use strategies
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 8
dc.journal.volume 30
dc.journal.number 8 en_US
dc.publocation Oxford en_US
dc.publocation USA
dc.identifier.startpage 988 en_US
dc.identifier.endpage 1000 en_US
dc.cauo.name SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.conference International Conference on Signal Processing and Communication Systems
dc.for 0705 Forestry Sciences
dc.for 0602 Ecology
dc.personcode 000006
dc.personcode 980151
dc.personcode 034078
dc.personcode 040345
dc.percentage 50 en_US
dc.classification.name Forestry Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US
dc.date.activity en_US
dc.date.activity 2010-12-13
dc.location.activity ISI:000280298000006 en_US
dc.location.activity Gold Coast, Australia
dc.description.keywords cuticular conductance
dc.description.keywords eucalypt woodland
dc.description.keywords night-time sap flow
dc.description.keywords nocturnal transpiration
dc.description.keywords stem refilling
dc.description.keywords stomatal conductance
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
pubs.organisational-group /University of Technology Sydney/Strength - C3
utslib.copyright.status Open Access
utslib.copyright.date 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history General (ID: 2)

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