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Items starting with P


A written statement defining goals and objectives and the actions or treatments needed to attain the goals and objectives. Prescriptions are written for discrete portions of National Forest System lands. A prescription can be resource specific (such as for prescribed fire or silviculture) or, in the case of management prescriptions, broad to attain multiple use goals and objectives.

Present Net Value (PNV)

Also called Present Net Worth. The measure of the economic value of a project when costs and revenues occur in different time periods. Future revenues and costs are "discounted " to the present by an interest rate that reflects the changing value of a dollar over time. The assumption is that dollars today are more valuable than dollars in the future. PNV is used to compare project alternatives that have different cost and revenue flows.


Activities carried out in advance of fire occurrence to ensure effective suppression when the need arises.

Primitive (P)

A definition used in the Recreation Opportunity Spectrum (ROS) to characterize an area that is essentially an unmodified natural environment of large size. Interaction between users is very low and evidence of other users is minimal. The area is managed to be essentially free from evidence of human-induced restrictions and controls. Motorized use within the area is not permitted.


The ability of an area to provide goods and services and to sustain ecological values.


A computer model for timber growth and yield. It projects per-acre growth and volume yield for commercial timber stands.

Proposed Species

Any species that is proposed by the Fish and Wildlife Service or the National Marine Fisheries Service to be listed as threatened or endangered under the Endangered Species Act.

Provincial Advisory Council (PAC)

see Resource Advisory Council.

Public Domain

The territory ceded to the Federal government by the original thirteen states, plus additions by treaty, cession, and purchase.

Public Involvement

The use of appropriate procedures to inform the public, obtain early and continuing public participation, and consider the views of interested parties in planning and decision making.