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Título: Drought-driven wildfire impacts on structure and dynamics in a wet Central Amazonian forest
Autor: Lopes, Aline Pontes
Silva, Camila V.J.
Barlow, Jos
Maniguaje Rincón, Nancy Lorena
Campanharo Augusto, Wesley
Nunes, Cássio Alencar
Almeida, Catherine Torres de
Silva Junior, Celso Henrique Leite
Cassol, Henrique Luís Godinho
Dal'Agnol da Silva, Ricardo
Stark, Scott Christopher
Graça, Paulo Maurício Lima de Alencastro
Palavras-chave: Biomass
Forest degradation
Morphological traits
Data do documento: 2021
Revista: Proceedings of the Royal Society B: Biological Sciences
É parte de: Volume 288 ; Number 20210094
Abstract: While the climate and human-induced forest degradation is increasing in the Amazon, fire impacts on forest dynamics remain understudied in the wetter regions of the basin, which are susceptible to large wildfires only during extreme droughts. To address this gap, we installed burned and unburned plots immediately after a wildfire in the northern Purus-Madeira (Central Amazon) during the 2015 El-Niño. We measured all individuals with diameter of 10 cm or more at breast height and conducted recensuses to track the demographic drivers of biomass change over 3 years. We also assessed how stem-level growth and mortality were influenced by fire intensity (proxied by char height) and tree morphological traits (size and wood density). Overall, the burned forest lost 27.3% of stem density and 12.8% of biomass, concentrated in small and medium trees. Mortality drove these losses in the first 2 years and recruitment decreased in the third year. The fire increased growth in lower wood density and larger sized trees, while char height had transitory strong effects increasing tree mortality. Our findings suggest that fire impacts are weaker in the wetter Amazon. Here, trees of greater sizes and higher wood densities may confer a margin of fire resistance; however, this may not extend to higher intensity fires arising from climate change. © 2021 The Authors.
DOI: 10.1098/rspb.2021.0094
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