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Land Uses, Fire, and Invasion: Exotic Annual Bromus and Human Dimensions

  • David A. PykeEmail author
  • Jeanne C. Chambers
  • Jeffrey L. Beck
  • Matthew L. Brooks
  • Brian A. Mealor
Chapter
Part of the Springer Series on Environmental Management book series (SSEM)

Abstract

Human land uses are the primary cause of the introduction and spread of exotic annual Bromus species. Initial introductions were likely linked to contaminated seeds used by homesteading farmers in the late 1880s and early 1900s. Transportation routes aided their spread. Unrestricted livestock grazing from the 1800s through the mid-1900s reduced native plant competitors leaving large areas vulnerable to Bromus dominance. Ecosystems with cooler and moister soils tend to have greater potential to recover from disturbances (resilience) and to be more resistant to Bromus invasion and dominance. Warmer and drier ecosystems are less resistant to Bromus and are threatened by altered fire regimes which can lead to Bromus dominance, impacts to wildlife, and alternative stable states. Native Americans used fire for manipulating plant communities and may have contributed to the early dominance of Bromus in portions of California. Fire as a tool is now limited to site preparation for revegetation in most ecosystems where Bromus is a significant problem. Once Bromus dominates, breaking annual grass/fire cycles requires restoring fire-tolerant perennial grasses and forbs, which can compete with Bromus and resist its dominance. Current weed management policies often lack regulations to prevent further expansion of Bromus. Research is needed on how and where livestock grazing might help increase perennial grass and forb cover and density to create ecosystems that are more resistant to Bromus. Also, studies are needed to ascertain the role, if any, of oil and gas development in contributing to the spread of Bromus.

Keywords

Energy development Farming Grazing Management policies Wildlife responses 

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Copyright information

© Springer International Publishing Switzerland 2016

Authors and Affiliations

  • David A. Pyke
    • 1
    Email author
  • Jeanne C. Chambers
    • 2
  • Jeffrey L. Beck
    • 3
  • Matthew L. Brooks
    • 4
  • Brian A. Mealor
    • 5
  1. 1.US Geological SurveyForest and Rangeland Ecosystem Science CenterCorvallisUSA
  2. 2.USDA Forest ServiceRocky Mountain Research StationRenoUSA
  3. 3.Department of Ecosystem Science and ManagementUniversity of WyomingLaramieUSA
  4. 4.US Geological SurveyWestern Ecological Research CenterOakhurstUSA
  5. 5.Sheridan Research and Extension CenterUniversity of WyomingSheridanUSA

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