Fire-Induced Tree Mortality
This project is a continuation and expansion of several past research projects on fire-induced tree mortality. Please see individual project pages (Resource tab) for details on Douglas-fir and Fire, Reintroducing Fire into Long-unburned Forests, and Wildfire effects in grand fir-hemlock forests.
Tree mortality is an obvious and important consequence of fire in forested ecosystems. Yet our understanding of how fire kills trees is surprisingly rudimentary. Current models of fire-induced tree mortality use simple linear models optimized for a small set of commercially important species and most incorporate only single parameters for defense (bark thickness) and injury (crown scorch). Not surprisingly, the utility of these models have been called into question by managers and scientists. Crucially, we lack an understanding of the direct and indirect role of climate in determining post-fire tree mortality. This gap in understanding greatly limits our ability to accurately predict mortality from fire and extrapolate to novel climates, which in turn limits application of appropriate management actions to increase forest resilience to wildfire and estimate fire-caused feedbacks to the global carbon cycle.

Heat transfer process involved in tree mortality.
We are conducting the first continental-scale characterization of climatic influences of fire-induced tree mortality using an unprecedented database of over 87,000 trees of 24 species across forests in the Western and Southeastern United States. Our analysis focuses on (1) evaluating the accuracy of currently used models and (2) assessing the influence of pre-fire climate on fire-induced tree mortality using the current framework of the existing software systems FOFEM, BehavePlus, and FFE-FVS.
Principal Investigator:
- Sharon Hood
- Morgan Varner
- Phillip Van Mangtem
Funding Contributor(s): Joint Fire Science Program

Post-fire crown injury in Pinus ponderosa. Heat from fires causes diverse visual injuries to crown foliage, buds and branches. These injuries are linked to several potential mechanisms that result in stress, reductions in tree growth and branch and whole tree death
Key Personnel
Principal Investigator
-
Person
Sharon M. Hood, PhD
Research Ecologisthttps://research.fs.usda.gov/about/people/sharon.hood -
Person
Julian (Morgan) Varner, PhD
Research Biological Scientisthttps://research.fs.usda.gov/about/people/julian.m.varner -
Phillip Van Mangtem
Collaborators
Funding Contributor(s):
- Joint Fire Science Program