Forest fragmentation impacts the seasonality of Amazonian evergreen canopies

Allbwn ymchwil: Cyfraniad at gyfnodolynErthygladolygiad gan gymheiriaid

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Dangosydd eitem ddigidol (DOI)

  • Matheus Henrique Nunes
    University of Helsinki
  • José Luis C. Camargo
    National Institute of Amazonian Research (INPA), Manaus
  • Gregoire Vincent
    University of Montpellier
  • Kim Calders
    Department of Experimental Clinical and Health Psychology, Ghent University, Ghent, Belgium
  • Rafael S. Oliveira
    State University of Campinas
  • Alfredo Huete
    University of Technology, Sydney
  • Yhasmin Mendes de Moura
    Karlsruhe Institute of Technology (KIT)
  • Bruce Nelson
    National Institute of Amazonian Research (INPA), Manaus
  • Marielle Smith
    Michigan State University
  • Scott C. Stark
    Michigan State University
  • Eduardo Eiji Maeda
    University of Helsinki
Predictions of the magnitude and timing of leaf phenology in Amazonian forests remain highly controversial. Here, we use terrestrial LiDAR surveys every two weeks spanning wet and dry seasons in Central Amazonia to show that plant phenology varies strongly across vertical strata in old-growth forests, but is sensitive to disturbances arising from forest fragmentation. In combination with continuous microclimate measurements, we find that when maximum daily temperatures reached 35 °C in the latter part of the dry season, the upper canopy of large trees in undisturbed forests lost plant material. In contrast, the understory greened up with increased light availability driven by the upper canopy loss, alongside increases in solar radiation, even during periods of drier soil and atmospheric conditions. However, persistently high temperatures in forest edges exacerbated the upper canopy losses of large trees throughout the dry season, whereas the understory in these light-rich environments was less dependent on the altered upper canopy structure. Our findings reveal a strong influence of edge effects on phenological controls in wet forests of Central Amazonia.

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CyfnodolynNature Communications
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StatwsCyhoeddwyd - 17 Chwef 2022
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