US Forest Service Research & Development
Contact Information
  • US Forest Service Research & Development
  • 1400 Independence Ave., SW
  • Washington, D.C. 20250-0003
  • 800-832-1355
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Research Topics

Priority Areas

  • Forest Disturbances

RMRS Program Areas

Emily K. Heyerdahl

Research Forester
5775 Highway 10 West
United States

Phone: 406-829-6939
Fax: 406-329-4877
Contact Emily K. Heyerdahl

Current Research

Historical fire regimes in mixed-conifer forests of Central Oregon
Historical fire regimes in Utah
Historical fire regimes in mixed-conifer forests of the Flathead Valley, Montana
Condition of live, fire-scarred ponderosa pine trees 21 years after removing fire-scarred partial cross sections

Research Interests

Heyerdahl's research focuses on inferring the drivers of spatial and temporal variation in fire regimes over the past several centuries using tree rings and modern fire records. These drivers include climate, forest type, topography, and land use.

Past Research

Spatial and temporal varation of historical fires in the Blue Mountains, Oregon
Climate drivers of fire in the Northern Rockies: Past, present and future
Historical mixed-severity fire regimes in British Columbia, Canada
Climatic and human influences on historical fire regimes of Mexico
Fire history of Interior West Sagebrush Woodlands

Why This Research is Important

This research impacts both forest management and our understanding of basic forest and fire ecology. The National Fire Plan, the Federal Wildland Fire Management Policy, and the Forest Service's Cohesive Strategy clearly identify the need to restore frequent-fire forests by treating fuel. Knowledge of past fire regimes, how and why they varied across space, and how they affected forest structure and composition provides a basis for prescribing fuel treatments that mimic the effects of past fires, while knowledge of the climate forcing of extreme fire years provides a basis for scheduling such treatments. Spatially explicit reconstructions of fire regimes can be used to identify fundamental properties of those regimes, such as the scaling properties of fire frequency. Knowledge about the drivers of spatial and temporal variation in historical fire regimes is used by other scientists to parameterize, and validate simulation models, for example to predict the effects of climate change on future fire regimes. Anticipating the effects of climate change on future fire requires that we understand the effects of climate variation on past fires using tree rings and also that we bridge the past and the present by identifying the climate drivers of 20th-century fires from written archival records.


  • Oregon State University, Corvallis, OR, Geology , 1985
  • University of Washington, Atmospheric Sciences , 1991
  • University of Washington, Forestry , 1997

Professional Organizations

  • Association for Fire Ecology, Member (2006 - Current)
  • Ecological Society of America, Member (1995 - Current)
  • Tree-Ring Society, Lifetime Member (1991 - Current)

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Last updated on : 10/07/2015