Ecosystems

, Volume 17, Issue 6, pp 960–973 | Cite as

Bromus tectorum Response to Fire Varies with Climate Conditions

  • Kimberley Taylor
  • Tyler Brummer
  • Lisa J. Rew
  • Matt Lavin
  • Bruce D. Maxwell
Article

Abstract

The invasive annual grass Bromus tectorum (cheatgrass) forms a positive feedback with fire in some areas of western North America’s sagebrush biome by increasing fire frequency and size, which then increases B. tectorum abundance post-fire and dramatically alters ecosystem structure and processes. However, this positive response to fire is not consistent across the sagebrush steppe. Here, we ask whether different climate conditions across the sagebrush biome can explain B. tectorums variable response to fire. We found that climate variables differed significantly between 18 sites where B. tectorum does and does not respond positively to fire. A positive response was most likely in areas with higher annual temperatures and lower summer precipitation. We then chose a climatically intermediate site, with intact sagebrush vegetation, to evaluate whether a positive feedback had formed between B. tectorum and fire. A chronosequence of recent fires (1–15 years) at the site created a natural replicated experiment to assess abundance of B. tectorum and native plants. B. tectorum cover did not differ between burned and unburned plots but native grass cover was higher in recently burned plots. Therefore, we found no evidence for a positive feedback between B. tectorum and fire at the study site. Our results suggest that formation of a positive B. tectorum-fire feedback depends on climate; however, other drivers such as disturbance and native plant cover are likely to further influence local responses of B. tectorum. The dependence of B. tectorum’s response to fire on climate suggests that climate change may expand B. tectorums role as a transformative invasive species within the sagebrush biome.

Keywords

Bromus tectorum cheatgrass fire Idaho National Laboratory positive feedback sagebrush 

Supplementary material

10021_2014_9771_MOESM1_ESM.docx (19 kb)
Supplementary material 1 (DOCX 20 kb)

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  • Kimberley Taylor
    • 1
  • Tyler Brummer
    • 1
    • 3
  • Lisa J. Rew
    • 1
  • Matt Lavin
    • 2
  • Bruce D. Maxwell
    • 1
  1. 1.Land Resources and Environmental Sciences DepartmentMontana State UniversityBozemanUSA
  2. 2.Plant Sciences and Plant Pathology DepartmentMontana State UniversityBozemanUSA
  3. 3.Bio-Protection Research CentreLincoln UniversityCanterburyNew Zealand

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