Please use this identifier to cite or link to this item: https://repositorio.inpa.gov.br/handle/1/15615
Title: Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest
Authors: Albert, Loren P.
Wu, Jin
Prohaska, Neill
Camargo, Plínio Barbosa de
Huxman, Travis E.
Tribuzy, Edgard Siza
Ivanov, Valeriy Yu
Oliveira, Rafael S.
Garcia, Sabrina
Smith, Marielle N.
Oliveira Junior, Raimundo Cosme
Restrepo-Coupé, Natalia
Silva, Rodrigo da
Stark, Scott C.
Martins, Giordane Augusto
Penha, Deliane Vieira
Saleska, Scott Reid
Keywords: Age
Biochemistry
Broad-leaved Forest
Carbon
Demographic Survey
Drought
Dry Season
Leaf
Ontogeny
Phenology
Photosynthesis
Physiology
Stomatal Conductance
Tropical Forest
Amazonia
Nia
Carbon
Chlorophyll
Forest
Gas
Metabolism
Photosynthesis
Physiology
Plant Leaf
Plant Stoma
Season
Time Factor
Carbon
Chlorophyll
Forests
Gases
Photosynthesis
Plant Leaves
Plant Stomata
Seasons
Time Factors
Issue Date: 2018
metadata.dc.publisher.journal: New Phytologist
metadata.dc.relation.ispartof: Volume 219, Número 3, Pags. 870-884
Abstract: 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. © 2018 The Authors. New Phytologist © 2018 New Phytologist Trust
metadata.dc.identifier.doi: 10.1111/nph.15056
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