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In page Old-growth forest:

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Additionally, using stand age for old-growth categorization does not account for the diverse effects of human activity. For example, an old-growth forest logged at 30% needs less time to recover than an old-growth forest logged at 80%. On the other hand, a forest that recovers from a 30% harvest may consist of proportionately fewer hardwood trees than a forest logged at 80%, as more complete logging reduces competition from other tree species that could inhibit the regrowth of hardwoods.[citation needed]