Putting fire on the map of Brazilian savanna ecoregions.

Autor: Silva PS; Instituto Dom Luiz, Universidade de Lisboa, 1749-016, Lisboa, Portugal. Electronic address: pssilva@fc.ul.pt., Nogueira J; Institut für Landschaftsökologie, Westfälische Wilhelms (WWU) - Universität Münster, 48149, Münster, Germany. Electronic address: joananog@yahoo.com.br., Rodrigues JA; Departamento de Meteorologia, Universidade Federal do Rio de Janeiro, 21941-916, Rio de Janeiro, RJ, Brazil. Electronic address: abrant.julia@gmail.com., Santos FLM; Departamento de Meteorologia, Universidade Federal do Rio de Janeiro, 21941-916, Rio de Janeiro, RJ, Brazil; Programa de Pós-Graduação em Clima e Ambiente (CLIAMB), Instituto Nacional de Pesquisas da Amazônia (INPA) e Universidade do Estado do Amazonas (UEA), Manaus, AM, Brazil. Electronic address: filmaias@hotmail.com., Pereira JMC; Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017, Lisboa, Portugal. Electronic address: jmcpereira@isa.ulisboa.pt., DaCamara CC; Instituto Dom Luiz, Universidade de Lisboa, 1749-016, Lisboa, Portugal. Electronic address: cdcamara@fc.ul.pt., Daldegan GA; Moore Center for Science, Conservation International, 2011 Crystal Dr., Suite 600, Arlington, VA, USA. Electronic address: gabrieldaldegan@gmail.com., Pereira AA; Instituto Federal de Ciência e Tecnologia do Sul de Minas Gerais, 37890-000, Muzambinho, MG, Brazil. Electronic address: allan.pereira@ifsuldeminas.edu.br., Peres LF; Departamento de Meteorologia, Universidade Federal do Rio de Janeiro, 21941-916, Rio de Janeiro, RJ, Brazil. Electronic address: leonardo.peres@igeo.ufrj.br., Schmidt IB; Departamento de Ecologia, Instituto de Ciências Biológicas, Campus Universitário Darcy Ribeiro, 70910-900, Brasília, DF, Brazil. Electronic address: isabelbschmidt@gmail.com., Libonati R; Instituto Dom Luiz, Universidade de Lisboa, 1749-016, Lisboa, Portugal; Departamento de Meteorologia, Universidade Federal do Rio de Janeiro, 21941-916, Rio de Janeiro, RJ, Brazil; Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, 1349-017, Lisboa, Portugal. Electronic address: renata.libonati@igeo.ufrj.br.
Jazyk: angličtina
Zdroj: Journal of environmental management [J Environ Manage] 2021 Oct 15; Vol. 296, pp. 113098. Date of Electronic Publication: 2021 Jul 02.
DOI: 10.1016/j.jenvman.2021.113098
Abstrakt: The Brazilian savanna (Cerrado) is considered the most floristically diverse savanna in the world, home to more than seven thousand species. The region is a mosaic of savannas, grasslands and forests whose unique biophysical and landscape attributes are on the basis of a recent ecoregional map, paving the way to improved region-based strategies for land management actions. However, as a fire-prone ecosystem, Cerrado owes much of its distribution and ecological properties to the fire regime and contributes to an important parcel of South America burned area. Accordingly, any attempt to use ecoregion geography as a guide for management strategies should take fire into account, as an essential variable. The main aim of this study is to complement the ecoregional map of the Cerrado with information related to the fire component. Using remotely sensed information, we identify patterns and trends of fire frequency, intensity, seasonality, extent and scar size, and combine this information for each ecoregion, relying on a simple classification that summarizes the main fire characteristics over the last two decades. Results show a marked north-south fire activity gradient, with increased contributions from MATOPIBA, the latest agricultural frontier. Five ecoregions alone account for two thirds of yearly burned area. More intense fires are found in the Arc of Deforestation and eastern ecoregions, while ecoregions in MATOPIBA display decreasing fire intensity. An innovative analysis of fire scars stratified by size class shows that infrequent large fires are responsible for the majority of burned area. These large fires display positive trends over many ecoregions, whereas smaller fires, albeit more frequent, have been decreasing in number. The final fire classification scheme shows well defined spatially-aggregated groups, where trends are found to be the key factor to evaluate fire within their regional contexts. Results presented here provide new insights to improve fire management strategies under a changing climate.
(Copyright © 2021 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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