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Underplanting
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Planting young trees under the canopy of
an existing stand.
Understory
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see Story
Uneven-Aged Forest
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A forest in which there are considerable differences in age of trees and in which three or more age classes are present.
Uneven-Aged System
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A silvicultural system in which stands
have an uneven-aged structure.
Uniform Shelterwood
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see Shelterwood Cutting
Unmerchantable
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Of a tree or stand that has not attained
sufficient size, quality, and/or volume to make it suitable for
harvesting.
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