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

Loren P. Albert, Jin Wu, Neill Prohaska, Plinio Barbosa de Camargo, Travis E. Huxman, Edgard S. Tribuzy, Valeriy Y. Ivanov, Rafael S. Oliveira, Sabrina Garcia, Marielle N. Smith, Raimundo Cosme Oliveira Junior, Natalia Restrepo-Coupe, Rodrigo da Silva, Scott C. Stark, Giordane A. Martins, Deliane V. Penha, Scott Saleska

Research output: Contribution to journalArticle

10 Citations (Scopus)

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.

Original languageEnglish (US)
JournalNew Phytologist
DOIs
StateAccepted/In press - Jan 1 2018

Fingerprint

Crowns
tree crown
dry season
Carbon
physiology
uptake mechanisms
Photosynthesis
carbon
leaves
Demography
photosynthesis
Ecosystem
Forests
demographic statistics
stomatal conductance
phenology
canopy
vegetation

Keywords

  • Drought
  • Dry season green-up
  • Leaf ontogeny
  • Phenology
  • Photosynthesis
  • Scaling
  • Tropical forests

ASJC Scopus subject areas

  • Physiology
  • Plant Science

Cite this

Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest. / Albert, Loren P.; Wu, Jin; Prohaska, Neill; de Camargo, Plinio Barbosa; Huxman, Travis E.; Tribuzy, Edgard S.; Ivanov, Valeriy Y.; Oliveira, Rafael S.; Garcia, Sabrina; Smith, Marielle N.; Oliveira Junior, Raimundo Cosme; Restrepo-Coupe, Natalia; da Silva, Rodrigo; Stark, Scott C.; Martins, Giordane A.; Penha, Deliane V.; Saleska, Scott.

In: New Phytologist, 01.01.2018.

Research output: Contribution to journalArticle

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, S 2018, 'Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest', New Phytologist. https://doi.org/10.1111/nph.15056
Albert, Loren P. ; Wu, Jin ; Prohaska, Neill ; de Camargo, Plinio Barbosa ; Huxman, Travis E. ; Tribuzy, Edgard S. ; Ivanov, Valeriy Y. ; Oliveira, Rafael S. ; Garcia, Sabrina ; Smith, Marielle N. ; Oliveira Junior, Raimundo Cosme ; Restrepo-Coupe, Natalia ; da Silva, Rodrigo ; Stark, Scott C. ; Martins, Giordane A. ; Penha, Deliane V. ; Saleska, Scott. / Age-dependent leaf physiology and consequences for crown-scale carbon uptake during the dry season in an Amazon evergreen forest. In: New Phytologist. 2018.
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AU - Ivanov, Valeriy Y.

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AU - Smith, Marielle N.

AU - Oliveira Junior, Raimundo Cosme

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