Overgrazing!.

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Presentation transcript:

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. 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.

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!

What we know:

Before and After Overgrazing

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.

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!

What we know:

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

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

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!

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