Ecological Dynamics of Forest-Grassland Ecotones

Forest-grassland ecotones are transitional zones where closed-canopy woodlands merge into open herbaceous communities. These mosaics exhibit high spatial heterogeneity and host an array of species from both forest and grassland habitats, often supporting unique edge specialists. Dynamics in these zones are governed by interactions among climate, soils, disturbance regimes (fire, grazing, land use) and biotic processes such as competition and facilitation. Ecotones serve as sensitive indicators of climatic shifts and land-use change, with alterations in temperature and precipitation regimes driving boundary movements and compositional reorganisation. At local scales, edges may enhance species richness through the “edge effect,” while at broader scales, shifts in ecotone position can signal biome realignment under global change. Understanding these dynamics is critical for conservation planning, sustainable management of grazing and fire regimes, and prediction of carbon and water fluxes in temperate landscapes.

Research from Nature Portfolio

Recent studies have developed empirical models to delineate the extent and internal subdivisions of forest-steppe ecotones across Eurasia using macroclimatic predictors. By comparing expert-based maps with models driven solely by large-scale climate variables, researchers have identified regions where temperature, precipitation of the driest and warmest quarters, and potential evapotranspiration serve as the primary controls on ecotone occurrence. This approach has confirmed some traditional regional boundaries while highlighting areas—such as Inner Asia and Southeast Europe—where inclusion of topography, soil or vegetation structure would improve accuracy. The work underscores the value of integrating climate-only and multidisciplinary datasets to refine our understanding of biome transitions under contemporary climate variability.

Ecological Dynamics of Forest-Grassland Ecotones publication trend

The graph below shows the total number of articles in ecological dynamics of forest-grassland ecotones across all publications each year (not limited to Nature Index journals).

Technical terms

Ecotone: Transitional zone between two distinct ecosystems, marked by species overlap and unique edge communities.

Forest-steppe: A semi-humid mosaic of tree-dominated and grass-dominated patches, maintained by climate and disturbance.

Macroclimate: Large-scale climate characteristics (e.g. temperature, precipitation) that influence biome boundaries.

Edge effect: Increase in species richness or altered community structure at ecosystem boundaries.

Functional diversity: Range and value distribution of species’ traits within a community, reflecting ecosystem functioning.

References

1. Empirical delineation of the forest-steppe zone is supported by macroclimate. Scientific Reports (2023).
2. The edge of two worlds: A new review and synthesis on Eurasian forest‐steppes. Applied Vegetation Science (2018).
3. Beyond the Forest-Grassland Dichotomy: The Gradient-Like Organization of Habitats in Forest-Steppes. Frontiers in Plant Science (2020).
4. Underground deserts below fertility islands? Woody species desiccate lower soil layers in sandy drylands. Ecography (2020).