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Updated: Jun 3, 2025

Simulating Impacts of Ice Storms on Forest Ecosystems
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Boreal forests are heading for an open state.

Ronny Rotbarth1, Egbert H van Nes1, Marten Scheffer1

  • 1Environmental Sciences Department, Wageningen University & Research, Wageningen 6708 PB, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America
|January 10, 2025
PubMed
Summary

Boreal forests are warming rapidly and may shift to a less dense open forest state. This transition could increase wildfire risk and carbon release.

Keywords:
biome shiftsboreal forestsclimate changeecosystem modellingresilience

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Area of Science:

  • Ecology
  • Climate Change Science
  • Forestry

Background:

  • Boreal forests are warming four times faster than the global average.
  • Ecological systems may exhibit time lags, maintaining states unsupported by current environmental conditions.
  • Understanding biome shifts is critical for predicting future ecosystem dynamics.

Purpose of the Study:

  • To investigate potential future states of the boreal forest biome.
  • To analyze tree cover dynamics as indicators of biome shifts.
  • To assess the implications of projected changes for carbon storage and wildfire risk.

Main Methods:

  • Analysis of boreal tree cover dynamics.
  • Modeling of biome state shifts based on current environmental conditions.
  • Comparison of current forest cover distribution with projected future states.

Main Results:

  • Current boreal forest cover exhibits a bimodal distribution (dense forests and sparse woodlands).
  • Projected future state suggests a unimodal distribution of open forests (30-50% tree cover).
  • This shift implies a significant reduction in overall tree cover density across the biome.

Conclusions:

  • Boreal tree cover dynamics indicate a potential shift towards a widespread open forest state.
  • This transition may increase the frequency and intensity of forest fires.
  • Increased wildfires could lead to substantial releases of stored carbon, exacerbating climate change.