CO -induced biochemical changes in leaf volatiles decreased fire-intensity in the run-up to the Triassic-Jurassic boundary.

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ID: 276440
2022
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Abstract
The Triassic-Jurassic boundary marks the third largest mass extinction event in the Phanerozoic, characterized by a rise in CO -concentrations from c. 600 ppm to c. 2100-2400 ppm, coupled with a c. 3.0-4.0°C temperature rise. This is hypothesized to have induced major floral turnover, altering vegetation structure, composition and leaf morphology, which in turn are hypothesized to have driven changes in wildfire. However, the effects of elevated CO on fuel properties, such as chemical composition of leaves, are also important in influencing fire behaviour, but yet have not been considered. We test this by selecting three Triassic analogue species grown experimentally in different atmospheric compositions, and analyse variations in leaf chemistry, and leaf level flammability. These data were used to inform a fire behaviour model. We find that all three species tested showed a reduction in their volatile component, leading to lower flammability. Accounting for these variations in a model, our results suggest that leaf intrinsic flammability has a measurable impact on modelled fire behaviour. If scaled up to ecosystem level, periods of elevated CO may therefore be capable of inducing both biochemical and morphological changes in fuel properties, and thus may be capable of influencing fire behaviour.
Reference Key
baker2022cothe Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Baker, Sarah J;Dewhirst, Rebecca A;McElwain, Jennifer C;Haworth, Matthew;Belcher, Claire M;
Journal The New phytologist
Year 2022
DOI
10.1111/nph.18299
URL
Keywords
co2-induced biochemical changes triassic-jurassic transition fire behaviour fire intensity leaf volatiles lignin content

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