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Items starting with S

Service contract

A contract normally used by the government to carry out land management activities such as tree planting, site stabilization, thinning of forest stands where the trees to be cut have no commercial value, and similar activities.


A cutting method used in a more or less mature stand, designed to establish a new crop under the protection of the old.

Shelterwood cutting

The removal of most trees, leaving those needed for sufficient shade to produce a new age class in a moderated microenvironment. Removal of the shelter trees may or may not occur after regeneration becomes established.

Single Tree Selection

Individual trees of all size classes are removed, as uniformly as possible, throughout the stand to promote the growth of remaining trees and to provide space for regeneration.

Site Preparation

The general term for removing unwanted vegetation, slash, roots, and stones from a site before reforestation. Naturally occurring wildfire, as well as prescribed fire can prepare a site for natural regeneration.

Size Class

One of the three intervals of tree stem diameters used to classify timber in the Forest Plan data base. The size classes are: Seedling/Sapling (less than 5 inches in diameter); Pole Timber (5 to 7 inches in diameter); Sawtimber (greater than 7 inches in diameter)

Skid road (skid trail)

An access cut through the woods for skidding.


A self-propelled machine (cable, clam-bunk, or grapple) used for dragging trees or logs.