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Feedbacks between vegetation and disturbance processes promote long-term persistence of forest–grassland mosaics in south Brazil

Author

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  • Blanco, Carolina Casagrande
  • Scheiter, Simon
  • Sosinski, Enio
  • Fidelis, Alessandra
  • Anand, Madhur
  • Pillar, Valério D.

Abstract

Vegetation changes, such as shrub encroachment and forest expansion over grasslands, prairies and savannas have been related to changes in climatic (mainly rainfall and temperature) and atmospheric conditions (CO2 concentration). However, a longstanding question in ecology is how mosaics of forests and open-canopy ecosystems could persist over millennia in sites where climatic conditions favor forests. Here we tested the influence of interactions between grass-tree competition, environmental heterogeneity (topography), seed dispersal, initial density and spatial aggregation of vegetation patches and disturbance behavior (fire) on the long-term coexistence of forests and grasslands in South Brazil. For this, we incorporated the adaptive dynamic global vegetation model (aDGVM) into a spatially explicit modeling approach (2D-aDGVM). Our results showed that recurrent disturbance related to grasses such as fires plays a key role in maintaining the long-term coexistence of forests and grasslands, mainly through feedbacks between disturbance frequency and grass biomass. Topographic heterogeneity affected the rate of forest expansion by adding spatio-temporal variability in vegetation-fire feedbacks. However, the spatial pattern and connectivity of fire-prone (grasslands) and fire-sensitive (forest) vegetation patches were more important to maintain the long-term coexistence of both alternative vegetation states than the initial proportion of forest and grasslands patches. The model is the first individual-based DGVM to consider the combined effects of topography, seed dispersal and fire spread behavior in a spatially explicit approach.

Suggested Citation

  • Blanco, Carolina Casagrande & Scheiter, Simon & Sosinski, Enio & Fidelis, Alessandra & Anand, Madhur & Pillar, Valério D., 2014. "Feedbacks between vegetation and disturbance processes promote long-term persistence of forest–grassland mosaics in south Brazil," Ecological Modelling, Elsevier, vol. 291(C), pages 224-232.
  • Handle: RePEc:eee:ecomod:v:291:y:2014:i:c:p:224-232
    DOI: 10.1016/j.ecolmodel.2014.07.024
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    Cited by:

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    2. Shi, Wenjiao & Liu, Yiting & Shi, Xiaoli, 2018. "Contributions of climate change to the boundary shifts in the farming-pastoral ecotone in northern China since 1970," Agricultural Systems, Elsevier, vol. 161(C), pages 16-27.

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