Daily and seasonal patterns of carbon and water fluxes above a north Australian savanna

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dc.contributor.author Eamus, D
dc.contributor.author Hutley, LB
dc.contributor.author O'Grady, AP
dc.date.accessioned 2009-12-21T02:30:45Z
dc.date.issued 2001
dc.identifier.citation Tree Physiology, 2001, 21 (12-13), pp. 977 - 988
dc.identifier.issn 0829-318X
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3915
dc.description.abstract Daily and seasonal fluxes of carbon dioxide and water vapor above a north Australian savanna were recorded over a complete dry season-wet season annual cycle using the eddy covariance technique. Wet season rates of photosynthesis and transpiration were larger than those measured in the dry season and were dominated by the presence of the grassy understory. As the dry season progressed and the grass understory died, ecosystem rates of assimilation and water vapor flux declined substantially. By the end of the dry season, canopy assimilation and evapotranspiration rates were 20-25% of wet season values. Assimilation was light saturated in the dry season but not in the wet season. Stomatal control of transpiration increased between the wet and dry season. This was revealed by the decline in the slope of E with increasing leaf-to-air vapor pressure difference (D) between wet and dry seasons, and also by the significant decrease in the ratio of boundary to canopy conductance observed between the wet and dry seasons. A simple pan-tropical modeling of leaf area index or wet season canopy CO2 flux was undertaken. It was shown that with readily available data for foliar N content and the ratio of rainfall to potential evaporation, leaf index and wet season canopy CO2 flux can be successfully estimated for a number of tropical ecosystems, including north Australian savannas.
dc.language eng
dc.relation.hasversion Accepted manuscript version
dc.title Daily and seasonal patterns of carbon and water fluxes above a north Australian savanna
dc.type Journal Article
dc.parent Tree Physiology
dc.journal.volume 12-13
dc.journal.volume 21
dc.journal.number en_US
dc.publocation Canada en_US
dc.identifier.startpage 977 en_US
dc.identifier.endpage 988 en_US
dc.cauo.name SCI.Environmental Sciences en_US
dc.conference Verified OK en_US
dc.for 0501 Ecological Applications
dc.for 0602 Ecology
dc.personcode 000006
dc.percentage 50 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Eddy covariance
dc.description.keywords Evapotranspiration
dc.description.keywords Photosynthesis
dc.description.keywords Seasonality
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 Closed Access
utslib.copyright.date 2015-04-15 12:23:47.074767+10
pubs.consider-herdc true
utslib.collection.history School of the Environment (ID: 344)
utslib.collection.history General (ID: 2)

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