Role Of Fire In Forest Ecosystems
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Role Of Fire In Forest Ecosystems

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A2 Ecosystems & Wilderness

A2 Ecosystems & Wilderness

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Role Of Fire In Forest Ecosystems Role Of Fire In Forest Ecosystems Presentation Transcript

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    • Read the CNN newsreport from 8 th August 2000 and listen to the two audio presentations
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    • How did they start?
    • Why did they burn for such along time?
    • Find Idaho on an atlas map
    • In which global biomes are Idaho and Montana located?
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    • Jack pine is well-adapted to fire. Serotinous cones, which have a waxy outer coating to protect the seeds, remain on the tree rather than dropping to the forest floor. Seeds can remain viable on the tree for 20 years or longer. When a fire occurs, the thick cone protects the jack pine seed from the intense heat. Jack pine seeds have been known to still be viable after exposure to heat at 1000 degrees Fahrenheit. That heat, however, opens the scales of the cone and releases the seed onto the ground where the fire has removed much of the existing vegetation and litter. Jack pine seeds require contact with mineral soil to germinate, so fire serves to prepare the seedbed, reduce competition from other plants, and release the jack pine seed. In addition, the short stature of jack pines makes crown fires a high likelihood; these very crown fires are necessary to release the seeds from dormancy.
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    • Research either bush fires in Australia or fire in another forest ecosystem
    • To what extent do they represent an increased pressure on the environment as a result of human activity?