Drought-driven wildfire impacts on structure and dynamics in a wet Central Amazonian forest

Pontes-Lopes, A. and Silva, C.V.J. and Barlow, J. and Rincón, L.M. and Campanharo, W.A. and Nunes, C.A. and de Almeida, C.T. and Silva Júnior, C.H.L. and Cassol, H.L.G. and Dalagnol, R. and Stark, S.C. and Graça, P.M.L.A. and Aragão, L.E.O.C. (2021) Drought-driven wildfire impacts on structure and dynamics in a wet Central Amazonian forest. Proceedings of the Royal Society B: Biological Sciences, 288 (1951). ISSN 0962-8452

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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.

Item Type:
Journal Article
Journal or Publication Title:
Proceedings of the Royal Society B: Biological Sciences
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/2700
Subjects:
ID Code:
155690
Deposited By:
Deposited On:
03 Jun 2021 15:50
Refereed?:
Yes
Published?:
Published
Last Modified:
04 Jun 2021 05:42