Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest

Albert, LP; Wu, J; Prohaska, N; de Camargo, PB; Huxman, TE; Tribuzy, ES; Ivanov, VY; Oliveira, RS; Garcia, S; Smith, MN; Oliveira Junior, RC; Restrepo-Coupe, N; da Silva, R; Stark, SC; Martins, GA; Penha, DV; Saleska, SR

Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest

Albert, LP Wu, J Prohaska, N de Camargo, PB Huxman, TE Tribuzy, ES Ivanov, VY Oliveira, RS Garcia, S Smith, MN Oliveira Junior, RC Restrepo-Coupe, N

da Silva, R Stark, SC Martins, GA Penha, DV Saleska, SR

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Publication Type:: Journal Article
Citation:: New Phytologist, 2018, 219 (3), pp. 870 - 884
Issue Date:: 2018-08-01

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Field	Value	Language
dc.contributor.author	Albert, LP	en_US
dc.contributor.author	Wu, J	en_US
dc.contributor.author	Prohaska, N	en_US
dc.contributor.author	de Camargo, PB	en_US
dc.contributor.author	Huxman, TE	en_US
dc.contributor.author	Tribuzy, ES	en_US
dc.contributor.author	Ivanov, VY	en_US
dc.contributor.author	Oliveira, RS	en_US
dc.contributor.author	Garcia, S	en_US
dc.contributor.author	Smith, MN	en_US
dc.contributor.author	Oliveira Junior, RC	en_US
dc.contributor.author	Restrepo-Coupe, N https://orcid.org/0000-0003-3921-1772	en_US
dc.contributor.author	da Silva, R	en_US
dc.contributor.author	Stark, SC	en_US
dc.contributor.author	Martins, GA	en_US
dc.contributor.author	Penha, DV	en_US
dc.contributor.author	Saleska, SR	en_US
dc.date.available	2018-01-08	en_US
dc.date.issued	2018-08-01	en_US
dc.identifier.citation	New Phytologist, 2018, 219 (3), pp. 870 - 884	en_US
dc.identifier.issn	0028-646X	en_US
dc.identifier.uri	http://hdl.handle.net/10453/128207
dc.description.abstract	© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust Satellite and tower-based metrics of forest-scale photosynthesis generally increase with dry season progression across central Amazônia, but the underlying mechanisms lack consensus. We conducted demographic surveys of leaf age composition, and measured the age dependence of leaf physiology in broadleaf canopy trees of abundant species at a central eastern Amazon site. Using a novel leaf-to-branch scaling approach, we used these data to independently test the much-debated hypothesis – arising from satellite and tower-based observations – that leaf phenology could explain the forest-scale pattern of dry season photosynthesis. Stomatal conductance and biochemical parameters of photosynthesis were higher for recently mature leaves than for old leaves. Most branches had multiple leaf age categories simultaneously present, and the number of recently mature leaves increased as the dry season progressed because old leaves were exchanged for new leaves. These findings provide the first direct field evidence that branch-scale photosynthetic capacity increases during the dry season, with a magnitude consistent with increases in ecosystem-scale photosynthetic capacity derived from flux towers. Interactions between leaf age-dependent physiology and shifting leaf age-demographic composition are sufficient to explain the dry season photosynthetic capacity pattern at this site, and should be considered in vegetation models of tropical evergreen forests.	en_US
dc.relation.ispartof	New Phytologist	en_US
dc.relation.isbasedon	10.1111/nph.15056	en_US
dc.subject.classification	Plant Biology & Botany	en_US
dc.subject.mesh	Plant Leaves	en_US
dc.subject.mesh	Carbon	en_US
dc.subject.mesh	Gases	en_US
dc.subject.mesh	Chlorophyll	en_US
dc.subject.mesh	Seasons	en_US
dc.subject.mesh	Photosynthesis	en_US
dc.subject.mesh	Time Factors	en_US
dc.subject.mesh	Brazil	en_US
dc.subject.mesh	Plant Stomata	en_US
dc.subject.mesh	Forests	en_US
dc.title	Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest	en_US
dc.type	Journal Article
utslib.citation.volume	3	en_US
utslib.citation.volume	219	en_US
utslib.for	0607 Plant Biology	en_US
utslib.for	0705 Forestry Sciences	en_US
utslib.for	06 Biological Sciences	en_US
utslib.for	07 Agricultural and Veterinary Sciences	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
utslib.copyright.status	closed_access
pubs.issue	3	en_US
pubs.publication-status	Published	en_US
pubs.volume	219	en_US

Abstract:

© 2018 The Authors. New Phytologist © 2018 New Phytologist Trust Satellite and tower-based metrics of forest-scale photosynthesis generally increase with dry season progression across central Amazônia, but the underlying mechanisms lack consensus. We conducted demographic surveys of leaf age composition, and measured the age dependence of leaf physiology in broadleaf canopy trees of abundant species at a central eastern Amazon site. Using a novel leaf-to-branch scaling approach, we used these data to independently test the much-debated hypothesis – arising from satellite and tower-based observations – that leaf phenology could explain the forest-scale pattern of dry season photosynthesis. Stomatal conductance and biochemical parameters of photosynthesis were higher for recently mature leaves than for old leaves. Most branches had multiple leaf age categories simultaneously present, and the number of recently mature leaves increased as the dry season progressed because old leaves were exchanged for new leaves. These findings provide the first direct field evidence that branch-scale photosynthetic capacity increases during the dry season, with a magnitude consistent with increases in ecosystem-scale photosynthetic capacity derived from flux towers. Interactions between leaf age-dependent physiology and shifting leaf age-demographic composition are sufficient to explain the dry season photosynthetic capacity pattern at this site, and should be considered in vegetation models of tropical evergreen forests.

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http://hdl.handle.net/10453/128207