Seasonal changes in photosynthesis of eight savanna tree species

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Show simple item record Eamus, D Myers, B Duff, G Williams, D 2011-02-07T06:21:46Z 1999-08
dc.identifier.citation Tree Physiology, 1999, 19 (10), pp. 665 - 671
dc.identifier.issn 0829-318X
dc.identifier.other C1UNSUBMIT en_US
dc.description.abstract Seasonal variations in carbon assimilation of eight tree species of a north Australian tropical savanna were examined over two wet seasons and one dry season (18 months). Assimilation rates (A) in the two evergreen species, Eucalyptus tetrodonta F. Muell. and E. miniata A. Cunn. ex Schauer, were high throughout the study although there was a 10-20% decline in the dry season compared with the wet season. The three semi-deciduous species (Erythrophleum chlorostachys (F. Muell.) Baillon, Eucalyptus clavigera A. Cunn. ex Schauer, and Xanthostemon paradoxus F. Muell.) showed a 25-75% decline in A in the dry season compared with the wet season, and the deciduous species (Terminalia ferdinandiana Excell, Planchonia careya (F. Muell.) Kunth, and Cochlospermum fraseri Planchon) were leafless for several months in the dry season. Generally, the ratio of intercellular CO2 concentration to ambient CO2 concentration (C(i):C(a)) was larger in the wet season than in the dry season, indicating a smaller stomatal limitation of photosynthesis in the wet season compared with the dry season. In all species, the C(i):C(a) ratio and A were essentially independent of leaf-to-air vapor pressure difference (LAVPD) during the wet season, but both parameters generally declined with increasing LAVPD in the dry season. The slope of the positive correlation between A and transpiration rate (E) was less in the wet season than in the dry season. There was no evidence that high E inhibited A. Instantaneous transpiration efficiency was lowest in the wet season and highest during the dry season. Nitrogen-use efficiency (NUE) was higher in the wet season than in the dry season because the decline in A in the dry season was proportionally larger than the decline in foliar nitrogen content. In the wet season, evergreen species exhibited higher NUE than semi-deciduous and deciduous species. In all species, A was linearly correlated with specific leaf area (SLA) and foliar N content. Foliar N content increased with increasing SLA. All species showed a decline in midday leaf water potential as the dry season progressed. Dry season midday water potentials were lowest in semi-deciduous species and highest in the deciduous species, with evergreen species exhibiting intermediate values.
dc.language eng
dc.title Seasonal changes in photosynthesis of eight savanna tree species
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 10
dc.journal.volume 19
dc.journal.number 10 en_US
dc.publocation Victoria en_US
dc.identifier.startpage 665 en_US
dc.identifier.endpage 671 en_US SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0705 Forestry Sciences
dc.personcode 000006
dc.percentage 100 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 en_US
dc.description.keywords Assimilation
dc.description.keywords Cochlospermum fraseri
dc.description.keywords Erythrophleum chlorostachys
dc.description.keywords Eucalyptus clavigera
dc.description.keywords Eucalyptus miniata
dc.description.keywords Eucalyptus tetrodonta
dc.description.keywords Nitrogen
dc.description.keywords Phenology
dc.description.keywords Planchonia careya
dc.description.keywords Savannas
dc.description.keywords Terminalia ferdinandiana
dc.description.keywords Transpiration
dc.description.keywords Xanthostemon paradoxus
pubs.embargo.period Not known
pubs.organisational-group /University of Technology Sydney
pubs.organisational-group /University of Technology Sydney/Faculty of Science
utslib.copyright.status Open Access 2015-04-15 12:23:47.074767+10
pubs.consider-herdc false
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history General (ID: 2)

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