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Landscape Ecology

, Volume 34, Issue 4, pp 771–792 | Cite as

Influence of fire refugia spatial pattern on post-fire forest recovery in Oregon’s Blue Mountains

  • William M. DowningEmail author
  • Meg A. Krawchuk
  • Garrett W. Meigs
  • Sandra L. Haire
  • Jonathan D. Coop
  • Ryan B. Walker
  • Ellen Whitman
  • Geneva Chong
  • Carol Miller
Research Article

Abstract

Context

Fire regimes in many dry forests of western North America are substantially different from historical conditions, and there is concern about the ability of these forests to recover following severe wildfire. Fire refugia, unburned or low-severity burned patches where trees survived fire, may serve as essential propagule sources that enable forest regeneration.

Objectives

To quantify the influence of fire refugia spatial pattern and other biophysical factors on the process of post-fire tree regeneration; in particular examining both the proximity and density of surrounding refugia to characterize the landscape of refugial seed sources.

Methods

We surveyed regeneration at 135 sites in stand-replacement patches across a gradient of fire refugia density in eastern Oregon, USA. We characterized the influence of refugial seed source pattern and other environmental factors on the abundance of regenerating seedlings, and examined the relationship between post-fire climate and the temporal pattern of ponderosa pine seedling establishment.

Results

Tree seedlings were present in 83% of plots 12–17 years post-fire, and densities varied substantially (0–67800 stems ha−1, median = 1100). Variation in seedling abundance was driven by the spatial patterns of refugial seed sources. Despite widespread post-fire shrub cover, high-severity burned forests have not undergone a persistent type conversion to shrublands. Ponderosa pine seedling establishment peaked 5–11 years after fire and was not closely associated with post-fire climate.

Conclusions

Fire refugia and the seed sources they contain fostered tree regeneration in severely burned patches. Management practices that reduce refugia within post-fire landscapes may negatively influence essential forest recovery processes.

Keywords

Mixed-conifer forest Resilience Refugia Tree regeneration US Pacific Northwest Wildfire 

Notes

Acknowledgements

This research was funded by the National Fire Plan through agreements between the Aldo Leopold Wilderness Research Institute and Oregon State University (16-JV-11221639-101) and Western Colorado University (16-JV-11221639-107). Access to field sites was facilitated by the Ochoco, Umatilla, and Malheur National Forests. We thank Jean McCalmont, Julie VanSandt, and Claire Tortorelli for assistance with data collection, and Marc-André Parisien for comments on earlier drafts. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.

Supplementary material

10980_2019_802_MOESM1_ESM.docx (767 kb)
Supplementary material 1 (DOCX 766 kb)

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Copyright information

© Springer Nature B.V. 2019

Authors and Affiliations

  1. 1.Department of Forest Ecosystems and SocietyOregon State UniversityCorvallisUSA
  2. 2.Haire Laboratory for Landscape EcologyBelfastUSA
  3. 3.School of Environment and SustainabilityWestern Colorado UniversityGunnisonUSA
  4. 4.Northern Forestry Centre, Canadian Forest ServiceNatural Resources CanadaEdmontonCanada
  5. 5.U.S. Geological Survey, Northern Rocky Mountain Science CenterJacksonUSA
  6. 6.Aldo Leopold Wilderness Research Institute, Rocky Mountain Research StationUSDA Forest ServiceMissoulaUSA

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