In this section the following words have the meanings indicated. “Old–growth forest” means a forest: At least 5 acres in size with a preponderance of old trees, of which the oldest exceed at least half the projected maximum attainable age for the species; and That exhibits several of the following characteristics: Shade–tolerant species are present in all age and size classes; Randomly distributed canopy gaps are present; A high degree of structural diversity characterized by multiple growth layers reflecting a broad spectrum of ages is present; An accumulation of dead wood of varying sizes and stages of decomposition accompanied by decadence in live dominant trees is present; and Pit and mound topography can be observed. “State conservation land” means: State parks; Wildlife management areas; and Natural resources management areas. Whenever the Department identifies an old–growth forest on State conservation land, the land shall be managed in a manner that prohibits logging. Nothing in this section may be interpreted to prohibit the Department from taking actions to protect old–growth forest from fire, animals, insects, disease, and erosion in a manner that has minimal adverse effects on the ecosystem and subject to conditions the Secretary considers necessary.