Umpqua Watersheds
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Glossary
Glossary Abbreviations

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  Glossary   U

Underburn
A burn by a surface fire that can consume ground vegetation and "ladder" fuels.
Understory
The trees and woody shrubs growing beneath the overstory in a stand of trees.
Uneven-aged management
Actions that maintain a forest or stand of trees composed of intermingling trees that differ markedly in age. Cutting methods that develop and maintain uneven-aged stands are single-tree selection and group selection. (See even-aged management.)
Unregulated harvest
Tree harvest that is not part of the allowable sale quantity (ASQ), such as road hazard trees.

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