mainline.   To chop branches, tops, or small trees after felling, so that the slash lies close to the ground. To cut the limbs from a felled tree. 1. In cable logging, the line used to retrieve turns of logs. 2. The main access road to a forest tract.
          management plan.  A written plan for the organized handling and operation of a forest property. It usually includes data and prescribes measures designed to provide optimum use of forest resources according to the landowner's objectives.
          marking timber.  Selecting and indicating, usually by an axe mark (blaze) or paint mark, trees to be cut or retained in a harvesting operation.
          maturity.  For a given species or stand, the approximate age or condition beyond which the growth rate declines or decay begins to assume economic importance.
          MBF.  Abbreviation for "1000 board ft."
          mensuration, forest.  The science dealing with the measurement of the volume, growth, and development of individual trees and stands, and the determination of the various products obtainable from them.
          merchantable.  That part of a tree that can be manufactured into a salable product.
          merchantable height.  The length of the tree stem from the top of the stump to the top of the last merchantable section. Usually expressed in ft or number of logs.
          merchantable timber.  A tree or stand of trees that may be converted into salable products.
          merchantable volume.  The amount of wood in a single tree or forest stand that is considered salable.
          monoculture.  The practice of growing a single species of tree or plant on a given land area.
          mountain beaver.  A small nocturnal rodent, found throughout the Coast Range in Oregon and Washington. This burrowing animal has a voracious appetite for Douglas-fir seedlings. Syn. boomer.
          mortality.  Death of forest trees as a result of competition, disease, insect damage, drought, wind, fire, and other factors. multiple?use management. Management and use of forest land for more than one purpose. timber composition of the plant cover or the season of grazing.
          multiple-use management.  Management and use of forest land for more than one purpose (timber, wildlife, watershed, etc.). Uses may be shared on the same acreage or allocated to different portions of a forest tract.

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