Coordinating leaf functional traits with branch hydraulic conductivity: Resource substitution and implications for carbon gain

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Show simple item record Taylor, D Eamus, D 2010-07-15T07:27:00Z 2008-08
dc.identifier.citation Tree Physiology, 2008, 28 (8), pp. 1169 - 1177
dc.identifier.issn 0829-318X
dc.identifier.other C1 en_US
dc.description.abstract We studied relationships among branch hydraulic conductivity, xylem embolism, stomatal conductance (gs), foliar nitrogen (N) concentration and specific leaf area (SLA) of seven tree species growing at four temperate woodland sites spanning a 464-1350 mm rainfall gradient. Specifically, we examined the question: are gs and foliar N concentration coordinated with branch hydraulic conductivity and, if so, what are the implications for carbon assimilation? Area-based, light-saturated photosynthetic rate (Aa) was uniquely and positively correlated with gs and foliar N concentration. Multiple regression analyses showed that, when variability in SLA was controlled for, the (positive) partial slope for each predictor remained significant. In contrast, there was a negative correlation between gs and foliar N concentration such that, for any given Aa, leaves with a high gs allocated less N to foliage than leaves with a low gs. Foliar N concentration was negatively correlated with branch hydraulic conductivity, whereas gs was positively correlated with branch hydraulic conductivity. These relationships were also significant when variability in leaf area to sapwood area ratio, gs and SLA were controlled for in a multiple regression, suggesting that the relationships were unique and independent of other confounding factors. Trees with low water transport capacity were able to support a high Aa by increasing investment in foliar N. Resource substitution occurred such that there was a trade-off between gs and foliar N in relation to branch hydraulic conductivity. High Aa could be sustained through either a high branch hydraulic conductivity and hence high gs and a low allocation to foliar N, or the effect of a low branch hydraulic conductivity and hence low gs could be offset by a high allocation to foliar N. The results are discussed in relation to mechanisms for minimizing the negative effects of limited water availability on carbon gain. © 2008 Heron Publishing.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.title Coordinating leaf functional traits with branch hydraulic conductivity: Resource substitution and implications for carbon gain
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 8
dc.journal.volume 28
dc.journal.number 8 en_US
dc.publocation Victoria en_US
dc.identifier.startpage 1169 en_US
dc.identifier.endpage 1177 en_US SCI.Faculty of Science en_US
dc.conference Verified OK en_US
dc.for 0607 Plant Biology
dc.for 0705 Forestry Sciences
dc.personcode 000006
dc.personcode 040345
dc.percentage 50 en_US Forestry Sciences en_US
dc.classification.type FOR-08 en_US
dc.edition en_US
dc.custom en_US en_US
dc.location.activity ISI:000258841300003 en_US
dc.description.keywords Gas exchange
dc.description.keywords Plant hydraulics
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 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history General (ID: 2)
utslib.collection.history School of the Environment (ID: 344)

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