Items starting with F

Fire return interval

The average number of years between successive fires in a designated area.

Fire severity

Denotes the scale at which vegetation and a site are altered or disrupted by fire, from low to high. It is a combination of the degree of fire effects on vegetation and on soil properties.

Fire suppression

The practice of controlling forest and rangeland fires in a safe, economical, and expedient fashion while meeting the natural resource objectives outlined in each national forest or grassland land management plan.

Fire-adapted ecosystem

An arrangement of populations that have made long-term genetic changes in response to the presence of fire in the environment.


Vegetation with characteristics that make it more susceptible to damage from fire, such as thin bark, shallow root systems, or a low-branching habit.


Vegetation with characteristics that increase its resistance to fire, such as thick bark and high-branching habits.

Fisheries habitat

Streams, lakes, and reservoirs that support fish, or have the potential to support fish.

Flood plain

A lowland adjoining a watercourse. At a minimum, the area is subject to a 1% or greater chance of flooding in a given year.


The plant life of an area.


Federal Land Policy and Management Act


Finding of No Significant Impact


All browse and non-woody plants that are eaten by wildife and livestock.


A broadleaf plant that has little or no woody material in it.


The part of a scene or landscape that is nearest to the viewer.

Forest health

The perceived condition of a forest derived from concerns about such factors as its age, structure, composition, function, vigor, presence of unusual levels of insects or disease, and resilience to disturbance. Individual and cultural viewpoints, land management objectives, spatial and temporal scales, the relative health of the stands that make up the forest, and the appearance of the forest at a point which influences the perception and interpretation of forest health.

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