Interactive effects of elevated CO2 and drought on nocturnal water fluxes in Eucalyptus saligna

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Show simple item record Zeppel, Melanie en_US Lewis, James en_US Medlyn, Belinda en_US Barton, Craig en_US Duursma, Ra en_US Eamus, Derek en_US Adams, Mark en_US Phillips, Nathan en_US Elsworth, David en_US Forster, Michael en_US Tissue, David en_US
dc.contributor.editor en_US 2012-10-12T03:33:26Z 2012-10-12T03:33:26Z 2011 en_US
dc.identifier 2010005666 en_US
dc.identifier.citation Zeppel Melanie et al. 2011, 'Interactive effects of elevated CO2 and drought on nocturnal water fluxes in Eucalyptus saligna', Oxford University Press, vol. 31, no. 9, pp. 932-944. en_US
dc.identifier.issn 0829-318X en_US
dc.identifier.other C1 en_US
dc.description.abstract Nocturnal water flux has been observed in trees under a variety of environmental conditions and can be a significant contributor to diel canopy water flux. Elevated atmospheric CO 2 (elevated [CO 2]) can have an important effect on day-time plant water fluxes, but it is not known whether it also affects nocturnal water fluxes. We examined the effects of elevated [CO 2] on nocturnal water flux of field-grown Eucalyptus saligna trees using sap flux through the tree stem expressed on a sapwood area (J s) and leaf area (E t) basis. After 19 months growth under well-watered conditions, drought was imposed by withholding water for 5 months in the summer, ending with a rain event that restored soil moisture. Reductions in J s and E t were observed during the severe drought period in the dry treatment under elevated [CO 2], but not during moderate- and post-drought periods. Elevated [CO 2] affected night-time sap flux density which included the stem recharge period, called 'total night flux' (19:00 to 05:00, J s,r), but not during the post-recharge period, which primarily consisted of canopy transpiration (23:00 to 05:00, J s,c). Elevated [CO 2] wet (EW) trees exhibited higher J s,r than ambient [CO 2] wet trees (AW) indicating greater water flux in elevated [CO 2] under well-watered conditions. However, under drought conditions, elevated [CO 2] dry (ED) trees exhibited significantly lower J s,r than ambient [CO 2] dry trees (AD), indicating less water flux during stem recharge under elevated [CO 2]. J s,c did not differ between ambient and elevated [CO 2]. Vapour pressure deficit (D) was clearly the major influence on night-time sap flux. D was positively correlated with J s,r and had its greatest impact on J s,r at high D in ambient [CO 2]. Our results suggest that elevated [CO 2] may reduce night-time water flux in E. saligna when soil water content is low and D is high. While elevated [CO 2] affected J s,r, it did not affect day-time water flux in wet soil, suggesting t at the responses of J s,r to environmental factors cannot be directly inferred from day-time patterns. Changes in J s,r are likely to influence pre-dawn leaf water potential, and plant responses to water stress. Nocturnal fluxes are clearly important for predicting effects of climate change on forest physiology and hydrology en_US
dc.language en_US
dc.publisher Oxford University Press en_US
dc.relation.hasversion Accepted manuscript version
dc.relation.isbasedon en_US
dc.rights This is a pre-copy-editing, author-produced PDF of an article accepted for publication in Tree Physiology following peer review. The definitive publisher-authenticated version Interactive effects of elevated CO2 and drought on nocturnal water fluxes in Eucalyptus saligna (2011) 31 (9): 932-944. is available online at:
dc.title Interactive effects of elevated CO2 and drought on nocturnal water fluxes in Eucalyptus saligna en_US
dc.parent Tree Physiology en_US
dc.journal.volume 31 en_US
dc.journal.number 9 en_US
dc.publocation UK en_US
dc.identifier.startpage 932 en_US
dc.identifier.endpage 944 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 060705 en_US
dc.personcode 034078 en_US
dc.personcode 0000070972 en_US
dc.personcode 0000028481 en_US
dc.personcode 0000022185 en_US
dc.personcode 0000064499 en_US
dc.personcode 0000070973 en_US
dc.personcode 0000070974 en_US
dc.personcode 0000070975 en_US
dc.personcode 0000070976 en_US
dc.personcode 0000027039 en_US
dc.percentage 100 en_US Plant Physiology en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity en_US
dc.description.keywords drought, elevated CO2, nocturnal, sap flow, sap flux, transpiration en_US

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