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Testing for changes in biomass dynamics in large-scale forest datasets.

Ervan Rutishauser1, Stuart J Wright1, Richard Condit2

  • 1Smithsonian Tropical Research Institute, Ancon, Panama.

Global Change Biology
|September 10, 2019
PubMed
Summary
This summary is machine-generated.

Tropical forests show significant variation in productivity and mortality due to climate variability, not long-term trends. Understanding disturbance and recovery is key for accurate carbon budget predictions.

Keywords:
biomass dynamiccarbon fluxeslong-term changetropical forests

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Area of Science:

  • Ecology
  • Climate Science
  • Forestry

Background:

  • Tropical forests are vital for the global carbon budget.
  • Recent studies indicate increasing biomass, productivity, and mortality in old-growth tropical forests.
  • These changes may stem from global change or recovery from past disturbances.

Purpose of the Study:

  • To develop a novel method to distinguish between global change impacts and recovery effects on tropical forest biomass.
  • To analyze the drivers of changes in forest biomass fluxes over time.

Main Methods:

  • Utilized 30 years of forest dynamics data from Barro Colorado Island, Panama.
  • Decomposed whole-plot biomass flux changes into contributions from successional stage distribution and stage-specific flux changes.
  • Investigated temporal variations in estimated above-ground biomass (EAGB) fluxes relative to initial EAGB (EAGBᵢ) in 10x10m quadrats.

Main Results:

  • Both productivity and mortality fluxes increased significantly with initial quadrat EAGB.
  • The distribution of EAGB across quadrats remained relatively stable over 30 years.
  • Fluxes varied significantly among census intervals, with higher productivity noted post-El Niño (1985-1990), indicating recovery.
  • Variation in whole-plot fluxes was primarily driven by changes in fluxes related to EAGBᵢ, not by shifts in EAGBᵢ distribution.

Conclusions:

  • Tropical forests exhibit high sensitivity to climate variability, leading to substantial temporal fluctuations in productivity and mortality.
  • No consistent long-term trend in productivity, mortality, or biomass was observed over 30 years, though variability might mask trends.
  • Accurate tropical forest carbon budget predictions necessitate incorporating disturbance-recovery dynamics and understanding temporal flux variability.