How Drought-Induced Forest Die-off Alters Microclimate and Increases Fuel Loadings and Fire Potentials. Ruthrof, K. X., Fontaine, J. B., Matusick, G., Breshears, D. D., Law, D. J., Powell, S., & Hardy, G. International Journal of Wildland Fire, 25(8):819+, 2016. doi abstract bibtex Forest die-offs associated with drought and heat have recently occurred across the globe, raising concern that associated changes in fuels and microclimate could link initial die-off disturbance to subsequent fire disturbance. Despite widespread concern, little empirical data exist. Following forest die-off in the Northern Jarrah Forest, south-western Australia, we quantified fuel dynamics and associated microclimate for die-off and control plots. Sixteen months post die-off, die-off plots had significantly increased 1-h fuels (11.8 vs 9.8 tonnes ha-1) but not larger fuel classes (10-h and 100-h fuels). Owing to stem mortality, die-off plots had significantly greater standing dead wood mass (100 vs 10 tonnes ha-1), visible sky (hemispherical images analysis: 31 vs 23\,%) and potential near-ground solar radiation input (measured as Direct Site Factor: 0.52 vs 0.34). Supplemental mid-summer microclimate measurements (temperature, relative humidity and wind speed) were combined with long-term climatic data and fuel load estimates to parameterise fire behaviour models. Fire spread rates were predicted to be 30\,% greater in die-off plots with relatively equal contributions from fuels and microclimate, highlighting need for operational consideration by fire managers. Our results underscore potential for drought-induced tree die-off to interact with subsequent fire under climate change.
@article{ruthrofHowDroughtinducedForest2016,
title = {How Drought-Induced Forest Die-off Alters Microclimate and Increases Fuel Loadings and Fire Potentials},
author = {Ruthrof, Katinka X. and Fontaine, Joseph B. and Matusick, George and Breshears, David D. and Law, Darin J. and Powell, Sarah and Hardy, Giles},
year = {2016},
volume = {25},
pages = {819+},
issn = {1049-8001},
doi = {10.1071/wf15028},
abstract = {Forest die-offs associated with drought and heat have recently occurred across the globe, raising concern that associated changes in fuels and microclimate could link initial die-off disturbance to subsequent fire disturbance. Despite widespread concern, little empirical data exist. Following forest die-off in the Northern Jarrah Forest, south-western Australia, we quantified fuel dynamics and associated microclimate for die-off and control plots. Sixteen months post die-off, die-off plots had significantly increased 1-h fuels (11.8 vs 9.8 tonnes ha-1) but not larger fuel classes (10-h and 100-h fuels). Owing to stem mortality, die-off plots had significantly greater standing dead wood mass (100 vs 10 tonnes ha-1), visible sky (hemispherical images analysis: 31 vs 23\,\%) and potential near-ground solar radiation input (measured as Direct Site Factor: 0.52 vs 0.34). Supplemental mid-summer microclimate measurements (temperature, relative humidity and wind speed) were combined with long-term climatic data and fuel load estimates to parameterise fire behaviour models. Fire spread rates were predicted to be 30\,\% greater in die-off plots with relatively equal contributions from fuels and microclimate, highlighting need for operational consideration by fire managers. Our results underscore potential for drought-induced tree die-off to interact with subsequent fire under climate change.},
journal = {International Journal of Wildland Fire},
keywords = {*imported-from-citeulike-INRMM,~INRMM-MiD:c-14216041,~to-add-doi-URL,corymbia-calophylla,die-off,droughts,eucalyptus-marginata,feedback,fire-danger-rating,fire-fuel,forest-fires,forest-resources,microclimate,spatial-spread,wildfires},
lccn = {INRMM-MiD:c-14216041},
number = {8}
}
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