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DBH The diameter of a tree stem at breast height (4.5 feet) above the ground. DIB (d.i.b.) Diameter inside bark. Diameter of a log at its small end, measured inside the bark.

Deciduous tree A tree that loses its leaves during the winter.

Defect The portion of a tree or log that is unusable for the intended product. Examples are decay, crook, and excessive limbiness.

Diameter See DBH or DIB.

Diameter class A tree stem diameter category that may include 1 or more inches of diameter.

Direct seeding See seeding.

Dominant See crown classification.

Duff Undecomposed organic matter (such as leaves, twigs, moss, pieces of bark and wood) that litters a forest floor.

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