College of Forestry

Global Trophic Cascades Program

Quaking aspen conditions elsewhere

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Aspen field data collected on the North Fork of the John Day (NFJD) Ranger District of the Umatilla National Forest, Oregon. Notice the lack of aspen recruitment.

 

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Aspen stand on the NFJD ranger district showing successful aspen regeneration. The coarse woody debris may funtion as a browsing barrier and assist in aspen regeneration.

 

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Buck and Pole fence used to exclude cattle and wild ungulates from aspen on the NFJD Ranger District.

 

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Intense conifer invasion of an aspen stand, NFJD Ranger District. Notice aspen recruitment alongside coarse woody debris.

 

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A 20 year old aspen exclosure in the Gros Ventre valley of the Bridger-Teton National Forest, Wyoming.

 

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Graduate student Jeff Hollenbeck, recording aspen stand characteristics. Fremont National Forest, south central Oregon.

 

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Pith trace showing the life history of a mature aspen. This aspen was browsed when it was a young sprout, resulting in a shape similar to a recently browsed aspen twig. Source: Roy Renkin and Don Despain. Yellowstone National Park

 

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Winter Ridge, Fremont National Forest, Oregon. Photos courtesy of OSU Department of Geosciences