The use of pre-dawn leaf water potential and MODIS LAI to explore seasonal trends in the phenology of Australian and southern African woodlands and savannas

Palmer, AR; Fuentes, S; Taylor, D; MacInnis-Ng, C; Zeppel, M; Yunusa, I; February, E; Eamus, D

The use of pre-dawn leaf water potential and MODIS LAI to explore seasonal trends in the phenology of Australian and southern African woodlands and savannas

Palmer, AR

Fuentes, S

Taylor, D MacInnis-Ng, C

Zeppel, M

Yunusa, I

February, E Eamus, D

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Publication Type:: Journal Article
Citation:: Australian Journal of Botany, 2008, 56 (7), pp. 557 - 563
Issue Date:: 2008-12-12

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Field	Value	Language
dc.contributor.author	Palmer, AR https://orcid.org/0000-0001-9179-2725	en_US
dc.contributor.author	Fuentes, S https://orcid.org/0000-0002-0377-5085	en_US
dc.contributor.author	Taylor, D	en_US
dc.contributor.author	MacInnis-Ng, C https://orcid.org/0000-0003-3935-9814	en_US
dc.contributor.author	Zeppel, M https://orcid.org/0000-0002-5510-0936	en_US
dc.contributor.author	Yunusa, I https://orcid.org/0000-0001-7456-3293	en_US
dc.contributor.author	February, E	en_US
dc.contributor.author	Eamus, D https://orcid.org/0000-0003-2765-8040	en_US
dc.date.issued	2008-12-12	en_US
dc.identifier.citation	Australian Journal of Botany, 2008, 56 (7), pp. 557 - 563	en_US
dc.identifier.issn	0067-1924	en_US
dc.identifier.uri	http://hdl.handle.net/10453/8618
dc.description.abstract	Trends in global soil moisture are needed to inform models of soil-plant-atmosphere interactions. Predawn leaf water potential (Ψpd), a surrogate for soil moisture and an index of plant water stress, has been routinely collected in Australian forests, woodlands and savannas, but the associated leaf area index (LAI) has seldom been available to enable the preparation of a Ψpd on LAI relationship. Following an analysis of Ψpd and MODIS LAI data from Australian forests, woodlands and savannas, we identified patterns in Ψpd which provide an understanding of the role of soil-moisture status in controlling LAI. In the savanna of northern Australia, the MODIS LAI product had a basal value of 0.96 during the dry season as compared with a mean value of 2.5 for the wet season. The dry season value is equivalent to the LAI of the tree component and corresponds with ground-truthed LAI. Ψpd is lowest (more negative) during the height of the dry season (late October) at -2.5MPa, and highest (-0.1MPa) during the wet season (early March). We present two models which predict Ψpd from the MODIS LAI product. These may be useful surrogates for studying trends in soil moisture in highly seasonal climates and may contribute to climate change research. © CSIRO 2008.	en_US
dc.relation.ispartof	Australian Journal of Botany	en_US
dc.relation.isbasedon	10.1071/BT08079	en_US
dc.subject.classification	Plant Biology & Botany	en_US
dc.title	The use of pre-dawn leaf water potential and MODIS LAI to explore seasonal trends in the phenology of Australian and southern African woodlands and savannas	en_US
dc.type	Journal Article
utslib.citation.volume	7	en_US
utslib.citation.volume	56	en_US
utslib.for	0607 Plant Biology	en_US
utslib.for	0602 Ecology	en_US
utslib.for	0605 Microbiology	en_US
pubs.embargo.period	Not known	en_US
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 Life Sciences
utslib.copyright.status	open_access
pubs.issue	7	en_US
pubs.publication-status	Published	en_US
pubs.volume	56	en_US

Abstract:

Trends in global soil moisture are needed to inform models of soil-plant-atmosphere interactions. Predawn leaf water potential (Ψpd), a surrogate for soil moisture and an index of plant water stress, has been routinely collected in Australian forests, woodlands and savannas, but the associated leaf area index (LAI) has seldom been available to enable the preparation of a Ψpd on LAI relationship. Following an analysis of Ψpd and MODIS LAI data from Australian forests, woodlands and savannas, we identified patterns in Ψpd which provide an understanding of the role of soil-moisture status in controlling LAI. In the savanna of northern Australia, the MODIS LAI product had a basal value of 0.96 during the dry season as compared with a mean value of 2.5 for the wet season. The dry season value is equivalent to the LAI of the tree component and corresponds with ground-truthed LAI. Ψpd is lowest (more negative) during the height of the dry season (late October) at -2.5MPa, and highest (-0.1MPa) during the wet season (early March). We present two models which predict Ψpd from the MODIS LAI product. These may be useful surrogates for studying trends in soil moisture in highly seasonal climates and may contribute to climate change research. © CSIRO 2008.

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http://hdl.handle.net/10453/8618