RNR test 3 Lecture SG

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ndumas2
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46761
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RNR test 3 Lecture SG
Updated:
2010-11-02 12:50:47
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RNR Lecture SG
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part 1 of test 3 lecture SG
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  1. Rangelands are
    grassland ecosystems used to graze domesticated livestock
  2. Rangeland degradation - causes
    Ruminants

    Cattle - massive use of grain and water resources
  3. Rangeland forage -
    forbs, sedges, rushes, and grasses
  4. Rangeland vegetation adaptations, roots, fire resistance
  5. Metabolic reserve
  6. Decreasers, increasers, invaders
  7. Grazing pressure -
    type of animals, number of animals, duration of grazing, and trampling
  8. Defoliators -
    overgrazing historically prevented by predation, disease, and movement across the grasslands
  9. Fire and drought are important natural disturbances why?
  10. Natural + human disturbances (hunting, development…) can degrade rangelands explain
  11. Carrying capacity -
    maximum sustainable density of grazers, varies with season, range condition, …
  12. Animal Unit Month - AUM
  13. Rangeland condition assessed with several metrics, % native plants, % production potential, …
  14. Historic rangeland community in the western U.S.
  15. Completion of the transcontinental railroad in 1869, huge changes in western grazing
  16. Public grazing - tragedy of the commons!
  17. 1909 - Stockraising Homestead Act
  18. Effects on U.S. rangeland resources:

    1905 - Forest Service
    1934 - Taylor Grazing Act
    1976 - Federal Land Policy and Management Act
    1978 - Rangeland Improvement Act
  19. The Bureau of Land Management (BLM)
  20. Range management skills - agronomy, wildlife science, hydrology, …
  21. Range management activities
    • Management of grazing pressure - continual versus rotational grazing systems
    • Vegetation suppression - exotic species problematic; herbicides, fire, mechanical methods
    • Reseeding
    • Wild herbivore control
    • Pest management - chemical and biological controls
    • Predator control - compound 1080, problems
    • Use of alternative livestock species
  22. Grazing fee controversy - rancher subsidies on public land

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