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Ecosystems

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Long-Term Effects of Fire on Vegetation Structure and Predicted Fire Behavior in Wyoming Big Sagebrush Ecosystems

  • Schyler A. Reis
  • Lisa M. Ellsworth
  • J. Boone Kauffman
  • David W. Wrobleski
Article

Abstract

Fire historically occurred across the sagebrush steppe, but little is known about how patterns of post-fire fuel accumulation influence future fire in Wyoming big sagebrush (Artemisia tridentata ssp. wyomingensis) communities. To quantify change in fuel composition and structure in intact sagebrush ecosystems, we sampled 17 years following prescribed fire in eight approximately 400 ha plots (4 burned, 4 unburned control) at Hart Mountain National Antelope Refuge, OR, USA. Fuels data were used to model potential fire behavior in burn and control plots across four environmental scenarios that mimic drying of fuels through the fire season. Seventeen years after fire total fuel loads were 7 × higher in controls (6015 kg ha−1) than burned plots (831 kg ha−1; P < 0.01). Herbaceous fuels were 5 times greater in burns (P < 0. 01). Shrub fuel was nearly 10 times higher in unburned plots (P < 0.01), and litter under shrubs in controls was 3.75 times greater than in burns (P < 0.01). Potential fire behavior was lower in burned plots than in unburned controls across all environmental scenarios. In the driest scenario, potential rate of spread ranged from 0.4 to 1.5 m min−1 in burns and 2.7 to 5.5 m min−1 in controls (P < 0.01). Maintaining resilience in these ecosystems at multiple spatial and temporal scales may include a consideration of the natural role of fire in good condition Wyoming big sagebrush ecosystems. This study shows that under these conditions, fire can promote good condition mid-successional ecosystems and can act as a fuel break, slowing the spread and decreasing the intensity of a future wildfire.

Keywords

Artemisia tridentata ssp. wyomingensis FCCS Fire behavior Hart Mountain Long-term fire effects Prescribed burning Sagebrush steppe 

Notes

Acknowledgements

This work was supported by the Joint Fire Science Program (Project #14-1-02-5) and the Greater Sheldon-Hart Conservation Fund. We thank the staff at HMNAR and field technicians and lab assistants: Heather Wrobleski, C. Norman Swanson, Michelle McDowell, Emily Platt, and Bobby Burdick. We are grateful for the fire modeling advice provided by Susan Pritchard. This project was conducted under Special Use Permit issued by the U.S. Fish and Wildlife Service; however, the methodology, analyses, and conclusions expressed represent the opinions of the author(s) and do not necessarily represent the views, positions, or policies of the Sheldon-Hart Mountain National Wildlife Refuge Complex.

Supplementary material

10021_2018_268_MOESM1_ESM.docx (15 kb)
Supplementary material 1 (DOCX 14 kb)

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Copyright information

© Springer Science+Business Media, LLC, part of Springer Nature 2018

Authors and Affiliations

  • Schyler A. Reis
    • 1
  • Lisa M. Ellsworth
    • 1
  • J. Boone Kauffman
    • 1
  • David W. Wrobleski
    • 2
  1. 1.Department of Fisheries and WildlifeOregon State UniversityCorvallisUSA
  2. 2.Plains Thompson Falls and Superior Ranger DistrictsUSDA Forest ServicePlainsUSA

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