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dc.contributor.authorEscoto-Rodriguez, M.en
dc.contributor.authorFacelli, J.en
dc.contributor.authorWatling, J.en
dc.identifier.citationFunctional Plant Biology, 2014; 41(12):1221-1229en
dc.description.abstractIn arid regions many tree species develop broad crowns. A number of hypotheses involve trade-offs between growth in height and horizontal spreading, but there is no explanation for the switch from vertical to horizontal growth during development. Using Acacia papyrocarpa Benth as a model, we measured tree height and crown shape across different sites and topographic positions. We also measured δ13C of phyllodes from crown tops and lateral spreading branches. Trees were significantly taller at the base of a hill, where water availability is typically greater, than on the adjacent steep hillslope. In contrast, δ13C from the treetops was not significantly different across this topographic gradient, despite variation in tree height. In addition, δ13C was higher at treetops than in lower, lateral branches. These observations are consistent with hydraulic limitation to tree height. The shape of mature and young crowns in open environments was not symmetrical. At all sites, branches were shortest, but tree crowns tallest, on south-facing (i.e. shadiest) aspect of crowns. This suggests that light limitation may also affect crown development. If upper branches become water-limited and lower branches light-limited, then middle lateral branches become the less-stressed part of the crown and may grow more, producing a broad crown.en
dc.description.statementofresponsibilityMartín Escoto-Rodríguez, José M. Facelli and Jennifer R. Watlingen
dc.publisherCSIRO Publishingen
dc.rightsJournal compilation © CSIRO 2014en
dc.subjectbroad crown; carbon isotopes composition; crown orientation; hydraulic limitation; hypothesis; stable carbon isotopes; Western myallen
dc.titleDo wide crowns in arid woodland trees reflect hydraulic limitation and reduction of self-shading?en
dc.typeJournal articleen
pubs.library.collectionEarth and Environmental Sciences publicationsen
dc.identifier.orcidFacelli, J. [0000-0002-0408-0082]en
dc.identifier.orcidWatling, J. [0000-0001-6305-9905]en
Appears in Collections:Earth and Environmental Sciences publications

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