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Items starting with N

Natural Disturbance

See Disturbance.

Natural Range of Variability

See Range of Variability

Natural Resource

A feature of the natural environment that is of value in serving human needs.


National Environmental Policy Act

Nest Survey

A way to estimate the size of a bird population by counting the number of nests in a given area.


National Forest recreation sites that have been inventoried.


National Marine Fisheries Service

No Action Alternative

The most likely condition expected to exist in the future if management practices continue unchanged.

No Surface Occupancy (NSO)

A fluid minerals leasing constraint that prohibits occupancy or disturbance on all or part of the lease surface to protect special values or uses. Lessees may exploit the fluid mineral resources under the leases restricted by this constraint through use of directional drilling from sites outside the NSO area.


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