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Occlusion
The process of healing of cut branch stubs by the cambium of the surrounding stem surface.

Old Growth
A stand of mature or overmature trees relatively uninfluenced by human activity.

Opening Up
Considerable reduction of canopy density, e.g., by lopping, felling, or poisoning selected trees, or naturally through pests, disease, or drought mortality.

Overmature
In even-aged management, those trees or stands past the mature stage.

Overstocked
see Stocking: overstocked

Overstory
see Story

Overstory Removal
A final harvest in which the cutting releases advance regeneration.

Overtopped Crown Class
see Crown Class: suppressed

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