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Abstract

Instruments were set up in six burned areas of Yellowstone National Park that were 7, 13, 25, 57, 90, and 260± years old, and analyses were made to measure the variation in physical factors, soil characteristics, plant cover, and animal communities . The 7, 13, and 25 year old burns were found to represent open habitats. The 57 year old burned area presented a closed canopy forest with a still extensive ground cover. In the 90 year old burn the undergrowth was still sparse and in the 260 year burn, it was negligible in most areas.

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