Convergence in hydraulic architecture, water relations and primary productivity amongst habitats and across seasons in Sydney

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dc.contributor.author Macinnis-Ng, C
dc.contributor.author McClenahan, K
dc.contributor.author Eamus, D
dc.date.accessioned 2009-12-21T02:30:08Z
dc.date.issued 2004
dc.identifier.citation Functional Plant Biology, 2004, 31 (5), pp. 429 - 439
dc.identifier.issn 1445-4408
dc.identifier.other C1UNSUBMIT en_US
dc.identifier.uri http://hdl.handle.net/10453/3761
dc.description.abstract Convergence in leaf traits across biomes demonstrates generality in plant functioning. Relationships between hydraulic architecture and photosynthesis are less well studied. We investigated convergence in minimum leaf water potential (Ψmin), conductivity per sapwood area (ks), Huber value (Hv) and xylem embolism and photosynthesis in four habitats across two seasons (summer and winter) in the Sydney region in heathland, woodland (ridge-top), woodland (below-ridge) and mangrove. Seasonality strongly influenced all parameters in all habitats. Winter Ψmin values were lower than those for summer in the heathland and both woodland habitats but summer Ψmin values were lower than those for winter in the mangrove. Summer ks values were higher than winter values in all habitats, while Hv was higher in winter than summer for all habitats. Loss of conductance due to xylem embolism was larger in summer than winter in eight of 11 species. We also investigated relationships between the hydraulic parameters across habitats. There was a strong, significant inverse correlation between log-transformed Hv and log-transformed ks, which held across the seasons. There were significant inverse correlations between Ψmin and xylem embolism, which held within seasons but not across seasons. We found a strong, significant positive correlation between ks and Ψmin also within seasons but not across seasons and a significant negative correlation between xylem embolism and ks for winter but only a weak negative correlation between xylem embolism and ks for summer. We believe the seasonal patterns and relationships in hydraulic architecture and water relations are driven by the cost of efficient sapwood. This is demonstrated by the negative correlation between photosynthetic rate and ks in winter.
dc.language eng
dc.relation.hasversion Accepted manuscript version en_US
dc.relation.isbasedon 10.1071/FP03194
dc.title Convergence in hydraulic architecture, water relations and primary productivity amongst habitats and across seasons in Sydney
dc.type Journal Article
dc.parent Functional Plant Biology
dc.journal.volume 5
dc.journal.volume 31
dc.journal.number en_US
dc.journal.number 5 en_US
dc.publocation Collingwood VIC, Australia en_US
dc.identifier.startpage 429 en_US
dc.identifier.endpage 439 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0607 Plant Biology
dc.personcode 000006
dc.personcode 980151
dc.percentage 100 en_US
dc.classification.name Plant Biology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords branch conductivity, hydraulic architecture, leaf water potential, vulnerability to xylem embolism, water relations en_US
dc.description.keywords Branch conductivity
dc.description.keywords Hydraulic architecture
dc.description.keywords Leaf water potential
dc.description.keywords Vulnerability to xylem embolism
dc.description.keywords Water relations
dc.description.keywords Branch conductivity
dc.description.keywords Hydraulic architecture
dc.description.keywords Leaf water potential
dc.description.keywords Vulnerability to xylem embolism
dc.description.keywords Water relations
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/Faculty of Science/School of the Environment
pubs.organisational-group /University of Technology Sydney/Strength - C3


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