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Management impacts on fire occurrence: A comparison of fire regimes of African and South American tropical savannas in different protected areas.
Alvarado, Swanni T; Silva, Thiago Sanna Freire; Archibald, Sally.
Afiliação
  • Alvarado ST; Universidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Ecosystem Dynamics Observatory, Avenida 24-A 1515, 13506-900, Rio Claro, Brazil; Centre for African Ecology, School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, Private Bag X3, WITS, 2050, South Africa. Electronic address: swanni_ta@yahoo.es.
  • Silva TSF; Universidade Estadual Paulista (Unesp), Instituto de Geociências e Ciências Exatas, Ecosystem Dynamics Observatory, Avenida 24-A 1515, 13506-900, Rio Claro, Brazil.
  • Archibald S; Centre for African Ecology, School of Animal, Plant and Environmental Sciences, University of the Witwatersrand, Johannesburg, Private Bag X3, WITS, 2050, South Africa.
J Environ Manage ; 218: 79-87, 2018 Jul 15.
Article em En | MEDLINE | ID: mdl-29665489
Humans can alter fire dynamics in grassland systems by changing fire frequency, fire seasonality and fuel conditions. These changes have effects on vegetation structure and recovery, species composition, and ecosystem function. Understanding how human management can affect fire regimes is vital to detect potential changes in the resilience of plant communities, and to predict vegetation responses to human interventions. We evaluated the fire regimes of two recently protected areas in Madagascar (Ibity and Itremo NPA) and one in Brazil (Serra do Cipó NP) before and after livestock exclusion and fire suppression policies. We compare the pre- and post-management fire history in these areas and analyze differences in terms of total annual burned area, density of ignitions, burn scar size distribution, fire return period and seasonal fire distribution. More than 90% of total park areas were burned at least once during the studied period, for all parks. We observed a significant reduction in the number of ignitions for Ibity NPA and Serra do Cipó NP after livestock exclusion and active fire suppression, but no significant change in total burned area for each protected area. We also observed a seasonal shift in burning, with fires happening later in the fire season (October-November) after management intervention. However, the protected areas in Madagascar had shorter fire return intervals (3.23 and 1.82 years) than those in Brazil (7.91 years). Our results demonstrate that fire exclusion is unattainable, and probably unwarranted in tropical grassland conservation areas, but show how human intervention in fire and vegetation patterns can alter various aspects of the fire regimes. This information can help with formulating realistic and effective fire management policies in these valuable conservation areas.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Ecossistema / Pradaria / Incêndios Tipo de estudo: Prognostic_studies Limite: Humans País/Região como assunto: Africa / America do sul / Brasil Idioma: En Revista: J Environ Manage Ano de publicação: 2018 Tipo de documento: Article País de publicação: Reino Unido
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Ecossistema / Pradaria / Incêndios Tipo de estudo: Prognostic_studies Limite: Humans País/Região como assunto: Africa / America do sul / Brasil Idioma: En Revista: J Environ Manage Ano de publicação: 2018 Tipo de documento: Article País de publicação: Reino Unido