AI Article Synopsis

  • Predictions about leaf growth timing in Amazonian forests are debated, and recent LiDAR surveys show that plant growth varies at different heights in old-growth forests and is impacted by disturbances like fragmentation.
  • During hot conditions (above 35°C) in the dry season, large trees in undisturbed areas lose plant material, while the understory thrives due to increased light from the canopy loss.
  • Edge effects from fragmented forests worsen tree losses in the upper canopy, but the understory remains less affected, highlighting the significance of forest edges on plant growth patterns in Central Amazonia.

Article Abstract

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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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8854568PMC
http://dx.doi.org/10.1038/s41467-022-28490-7DOI Listing

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