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A B C D E F G H I J K L M N O P Q R S T U V W X Y Z

Abiotic

Non-living. Climate is an abiotic component of ecosystems.

Activity Plan

see “Implementation Plan.”

Adaptive Management

A type of natural resource management that implies making decisions as part of an on-going process. Monitoring the results of actions will provide a flow of information that may indicate the need to change a course of action. Scientific findings and the needs of society may also indicate the need to adapt resource management to new information.

Administrative Unit

A National Forest, a National Grassland, a purchase unit, a land utilization project, Columbia River Gorge National Scenic Area, Land Between the Lakes, Lake Tahoe Basin Management Unit, Midewin National Tallgrass Prairie, or other comparable unit of the National Forest System.

Aerial Logging

Removing logs from a timber harvest area by helicopter. Fewer roads are required, so the
impact to an area is minimized.

Affected Environment

The natural environment that exists at the present time in an area being analyzed.

Age Class

An age grouping of trees according to an interval of years, usually 20 years. A single age class would have trees that are within 20 years of the same age, such as 1-20 years or 21-40 years.

Airshed

A geographic area that shares the same air.

Allotment

An area of land designated and managed for the grazing of livestock by one or more livestock operators with a prescribed number of livestock for a prescribed period of time.  It generally consists of public lands, but may include parcels of private and other Federal or State owned lands. Though an entire area may be divided into allotments, all land will not be grazed, because other uses, such as recreation or tree plantings, may be more important at a given time.

Alternative Dispute Resolution

Any process used to prevent, manage, or resolve conflicts using procedures other than traditional courtroom litigation or formal agency adjudication.

Anadromous Fish

Species of fish that mature in the sea and migrate into streams to spawn.

Aquifer

A body of rock that is saturated with water or transmits water. When people drill wells, they tap water contained within an aquifer.

Area of Critical Environmental Concern (ACEC)

Special Area designation established through the Bureau of Land Management land use planning process (43 CFR 1610.7-2) where special management attention is needed to protect and prevent irreparable damage to important historical, cultural, or scenic values, fish and wildlife resources, or other natural systems or processes, or to protect life and safety from natural hazards. The level of allowable use within an ACEC is established through the collaborative planning process. Designation of an ACEC allows for resource use limitations in order to protect identified resources or values.

Aspect

The direction a slope faces. A hillside facing east has an eastern aspect.


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