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Amazon rainforest adjusts to long-term experimental drought.

Pablo Sanchez-Martinez1, Lion R Martius2, Paulo Bittencourt3,4

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This summary is machine-generated.

Amazon rainforests can achieve stability despite prolonged drought. Initial tree mortality led to structural changes, increasing water availability for surviving trees and preventing ecosystem collapse.

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Area of Science:

  • Ecology
  • Hydrology
  • Forest Science

Background:

  • Prolonged drought is expected to cause significant biomass loss in Amazonian rainforests.
  • The long-term response of these ecosystems to persistent drought remains largely uncharacterized.

Purpose of the Study:

  • To investigate the eco-hydrological response of an Amazonian rainforest to over two decades of experimental drought.
  • To understand the mechanisms of resilience and adaptation in tropical forests under severe water stress.

Main Methods:

  • An experimental drought was applied to an Amazonian rainforest plot for more than 20 years.
  • Monitoring of tree mortality, ecosystem structure, and key hydraulic variables (leaf water potential, sap flow, tissue water content).
  • Comparison with a non-droughted control forest to assess eco-hydrological stability and homeostasis.

Main Results:

  • After an initial 15-year period of high tree mortality, the ecosystem reached a stable state.
  • Structural changes, including the loss of large trees, increased water availability for surviving trees.
  • Hydraulic variables in the droughted plot converged to those of the control plot, indicating hydraulic homeostasis.
  • Biomass stabilized in the last 7 years, but with overall reduced carbon accumulation in wood.

Conclusions:

  • Amazonian rainforests can exhibit resilience to persistent soil drought through eco-hydrological stabilization.
  • This resilience involves significant structural reorganization and a shift towards hydraulic homeostasis.
  • While preventing collapse, this stabilization leads to a forest with reduced biomass and carbon sequestration capacity.