Items starting with M

Mechanical transport

Any device for moving people or material in or over land, water, or air, having moving parts, that provides a mechanical advantage to the user, and that is powered by a living or nonliving power source. This includes, but is not limited to, sailboats, hang gliders, parachutes, bicycles, game carriers, carts, and wagons. It does not include wheelchairs when used as necessary medical appliances. It also does not include skis, snowshoes, rafts, canoes, sleds, travois, or similar primitive devices without moving parts.


A value in an ordered set of quantities below and above which falls an equal number of quantities.


Management Framework Plan

Micro Climate

The climate of a small site. It may differ from the climate at large of the area due to aspect tree cover (or the absence of tree cover), or exposure to winds.


A term used the management of visual resources or scenery. It refers to the visible terrain beyond the foreground where individual trees are still visible but do not stand out distinctly from the stand.

Mineral reserve

An estimate within specified accuracy limits of the valuable metal or mineral content of known deposits that may be produced under current economic conditions and with present technology.

Mineral resource

A concentration of naturally occurring solid, liquid, or gaseous material in or on the earth's crust in such form and amount that economic extraction of a commodity from the concentration is currently or potentially feasible.

Mineral Soil

Soil that consists mainly of inorganic material, such as weathered rock, rather than organic matter.

Mission (of the USDA Forest Service)

"To Care for the Land and Serve the People". As set forth in law the mission is to achieve quality land management under the sustainable multiple-use management concept to meet the diverse needs of people.


Actions taken to avoid, minimize, or rectify the impact of a land management practice.

Mixed Stand

A stand consisting of two or more tree species.

Monitoring (Plan Monitoring)

The process of tracking the implementation of land use plan decisions.

Monitoring and Evaluation

The periodic evaluation of forest management activities to determine how well objectives were met and how management practices should be adjusted. See "adaptive management".


Trees that were merchantable and have died within a specified period of time. The term mortality can also refer to the rate of death of a species in a given population or community.


Areas with a variety of plant communities over a landscape, such as areas with trees and areas without trees occurring over a landscape.

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