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Overgrazing!

Overgrazing!. What do you already know?. Brainstorm with your partners what you know about overgrazing, especially in Arizona. Be ready to report out!. What we know:. What is the Issue?. Overgrazing is allowing animals to graze to the point of damaging vegetation cover.

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Overgrazing!

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  1. Overgrazing!

  2. What do you already know? • Brainstorm with your partners what you know about overgrazing, especially in Arizona. • Be ready to report out!

  3. What we know:

  4. What is the Issue? • Overgrazing is allowing animals to graze to the point of damaging vegetation cover. • Overgrazing occurs when plants are exposed to livestock grazing for extended periods of time without sufficient recovery periods. • It reduces the usefulness of the land and is one cause of desertification and erosion. • Desertification is the process of turning once fertile areas into deserts.

  5. What do you already know about overgrazed desert ecosystems? • Brainstorm with your partners: what do they look like? What has happened? Etc. • Be ready to report out!

  6. What we know:

  7. Before and After Overgrazing

  8. Who is causing it? • Ranchers graze their livestock on public range lands. • Too many ranchers sharing the same area leads to overgrazing. • Overgrazing can also occur if ranchers leave their livestock in one area for too long.

  9. Why do you think this happens? • Brainstorm with your partners: why do multiple ranchers share the area? Why do they leave their livestock grazing too long in an area? Etc. • Be ready to report out!

  10. What we know:

  11. FACTS • Desertification is devouring more than 20,000 square miles of land worldwide every year • Creates conditions that intensify wildfires and stirring winds • Reduced root length makes the plants more susceptible to death during dry weather

  12. What is being affected? • Reduced ground cover. • Increased or accelerated erosion • Loss of vegetation. • Bush encroachment (invasion or intrusion) • Weed invasion, or an increase in undesirable (including exotic) plant species

  13. Rate your understanding of overgrazing including the issue, causes, and effects: • 0 = I don’t understand any of this • 1 = I understand some of it. • 2 = I understand most of it. • 3 = I understand this stuff! • 4 = I really get this and could help an absent peer! Talk to your tablemates & share your understanding!

  14. What is Being Done to Help? • Rotational grazing is a process of planned grazing that encourages pasture growth • Use No-till When Renovating Pasture • Shortening the time period during which the plant is exposed to grazing • Reduce the number of animals on the land

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