Daily and Seasonal Patterns of Carbon and Water Fluxes Above a North Australian Savanna

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dc.contributor.author Eamus, Derek en_US
dc.contributor.author Hutley, Lindsay en_US
dc.contributor.author O'Grady, Anthony en_US
dc.date.accessioned 2009-12-21T02:30:45Z
dc.date.available 2009-12-21T02:30:45Z
dc.date.issued 2001 en_US
dc.identifier 2004004627 en_US
dc.identifier.citation Eamus Derek, Hutley Lindsay, and O'Grady Anthony 2001, 'Daily and Seasonal Patterns of Carbon and Water Fluxes Above a North Australian Savanna', Heron Publishing, vol. 21, pp. 977-988. en_US
dc.identifier.issn 0829-318X en_US
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. en_US
dc.publisher Heron Publishing en_US
dc.relation.hasversion Accepted manuscript version
dc.relation.isbasedon http://dx.doi.org/10.1093/treephys/21.12-13.977
dc.relation.isbasedon http://dx.doi.org/10.1093/treephys/21.12-13.977 en_US
dc.rights The definitive publisher-authenticated version Tree Physiology Volume 21, Issue 12-13 Pp. 977-988. is available online at: http://dx.doi.org/10.1093/treephys/21.12-13.977
dc.title Daily and Seasonal Patterns of Carbon and Water Fluxes Above a North Australian Savanna en_US
dc.parent Tree Physiology en_US
dc.journal.volume 21 en_US
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 060200 en_US
dc.personcode 000006 en_US
dc.personcode 0000018330 en_US
dc.personcode 0000024179 en_US
dc.percentage 50 en_US
dc.classification.name Ecology en_US
dc.classification.type FOR-08 en_US
dc.description.keywords eddy covariance, evapotranspiration, photosynthesis, seasonality. en_US

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