Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/2518
Título: Anthropogenic and climatic control upon vegetation fires: new insights from satelite observations to assess current and future impacts
Autor: Le Page, Yannick Lucien Bernard
Orientador: Pereira, José Miguel Cardoso
Palavras-chave: vegetation fires
anthropogenic activities
fire modeling
environmental changes
fogos de vegetação
actividades antropogénicas
modelação do fogo
alterações ambientais
Data de Defesa: 2009
Resumo: Vegetation fires actively participate in ecosystem dynamics and atmospheric composition. Their contemporaneous occurrence and impacts – described under the concept of “fire regimes” – is driven by climate, vegetation, and human activities – the components of the “fire triangle”. The gaps in our understanding of those drivers hamper the proper consideration of fires in various domains, including ecosystems management, vegetation modeling, and climate change investigation. This thesis capitalizes on satellite observations to depict the anthropogenic and climatic influence on fire regimes. Fire inter-annual variability is shown to be dominated by large scale climatic patterns, of which the El Niño-Southern Oscillation has the most widespread and long term footprint. Fire frequency and seasonality are more complex, being determined by the interaction of all three factors of the fire triangle. The evaluation of a vegetation-fire model thus reveals significant discrepancies. It suggests a great margin of progress on representing of the anthropogenic factor, supported by the wide range of fire practices identified from fire season dynamics. A model specific to tropical deforestation fires is developed, as a regional application of this thesis contributions. Climate is a forceful safeguard against forest conversion progress, but ongoing environmental changes could revert the situation.
Descrição: Doutoramento em Engenharia Florestal - Instituto Superior de Agronomia
URI: http://hdl.handle.net/10400.5/2518
Aparece nas colecções:BISA - Teses de Doutoramento / Doctoral Thesis

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