Fire Dynamics and Ecological Responses in Terrestrial Ecosystems

Fire acts as both a natural disturbance and a driver of ecosystem change across a wide range of terrestrial biomes. The behaviour of fire—shaped by fuel quantity and continuity, weather conditions and topography—determines its intensity, severity and spatial pattern. In fire-adapted systems such as savannas and Mediterranean shrublands, periodic burns maintain species diversity, regulate competition and promote nutrient cycling. In contrast, forests not adapted to frequent fire may experience altered successional pathways, canopy opening and persistent degradation when fire regimes intensify or shift in seasonality. At landscape scales, interactions between land-use change and climate variability modulate ignition sources and fuel moisture, creating feedbacks that can transform carbon sinks into net carbon sources. Understanding these dynamics, and the subsequent ecological responses of vegetation structure, soil processes and biotic communities, is crucial for informing management strategies that balance biodiversity conservation, carbon storage and human livelihoods under a warming climate.

Research from Nature Portfolio

Recent studies have synthesised multiple methodologies to assess carbon fluxes in tropical forests during climate extremes. State-of-the-art modelling and inversion techniques reveal that while the Amazon as a whole has oscillated between a weak carbon sink and source over the past decade, regions experiencing droughts and increased wildfires have shifted towards net emissions. Complementary work has demonstrated that drought-induced fires in tropical forests can rival or exceed the carbon released by deforestation alone, highlighting substantial emissions that are often omitted from national inventories. These findings underscore the need to integrate forest fire dynamics into carbon accounting and policy frameworks aimed at mitigating climate change.

Fire Dynamics and Ecological Responses in Terrestrial Ecosystems publication trend

The graph below shows the total number of articles in fire dynamics and ecological responses in terrestrial ecosystems across all publications each year (not limited to Nature Index journals).

Technical terms

Fire regime: The characteristic pattern of fires in a region, defined by frequency, intensity, seasonality and spatial extent.

Fuel load: The amount and continuity of combustible organic material (dead or live) available to sustain fire.

Fire intensity: The rate of heat release per unit length of fire front, reflecting energy output and potential ecological impacts.

Carbon sink: An ecosystem component or process that absorbs more carbon dioxide than it emits, thereby reducing atmospheric CO₂.

Canopy structure: The vertical and horizontal arrangement of foliage and branches, which influences light penetration, microclimate and fire behaviour.

References

1. Synthesis of the land carbon fluxes of the Amazon region between 2010 and 2020. Communications Earth & Environment (2024).
2. 21st Century drought-related fires counteract the decline of Amazon deforestation carbon emissions. Nature Communications (2018).
3. The gathering firestorm in southern Amazonia. Science Advances (2020).
4. A large‐scale field assessment of carbon stocks in human‐modified tropical forests. Global Change Biology (2014).