Fire passage on geomorphic fractures in Cerrado: effect on vegetation

Otacílio Antunes Santana; José Marcelo Imaña Encinas; Flávio Luiz de Souza Silveira

doi:10.4336/2016.pfb.36.88.885

Authors

Otacílio Antunes Santana Universidade Federal de Pernambuco
José Marcelo Imaña Encinas Universidade de Brasília, Faculdade de Tecnologia
Flávio Luiz de Souza Silveira Instituto Brasileiro do Meio Ambiente e Recursos Naturais Renováveis

DOI:

https://doi.org/10.4336/2016.pfb.36.88.885

Keywords:

Biogeomorphology, Fire ecology, Dry period

Abstract

Geomorphic fracture is a natural geologic formation that sometimes forms a deep fissure in the rock with the establishment of soil and vegetation. The objective of this work was to analyze vegetation within geomorphic fractures under the effect of wildfire passage. The biometric variables evaluated before and after fire passage were: diameter, height, leaf area index, timber volume, grass biomass, number of trees and shrubs and of species. Results (in fractures) were compared to adjacent areas (control). The effect of wildfire passage on vegetation within geomorphic fractures was not significant because fire followed plant biomass bed and when it met the fracture (wetter), it changed from soil surface to canopy surface (jump fire effect), affecting without significance the number of plants or species; so, fracture could be plants refuge against fire passage. We could infer in our experimental model that quality of plant biomass bed could be more significant than quantity, and microclimate variability recruits plants to the refuge (geomorphic fracture).

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Author Biographies

Otacílio Antunes Santana, Universidade Federal de Pernambuco

http://lattes.cnpq.br/4237732461961452

José Marcelo Imaña Encinas, Universidade de Brasília, Faculdade de Tecnologia

http://lattes.cnpq.br/3344356544470512

Flávio Luiz de Souza Silveira, Instituto Brasileiro do Meio Ambiente e Recursos Naturais Renováveis

http://lattes.cnpq.br/2536664752467531

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