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L

Lacustrine
Includes wetlands and deepwater habitats with the following characteristics: (1) situated in a topographic depression or a dammed river channel; (2) lacking trees, shrubs, and persistent emergents with greater than 30 percent aerial coverage; and (3) total area exceeds 20 acres. Similar wetland and deepwater habitats < 20 acres in size are included where water depth exceeds 6.6 feet at low water. The typical lacustrine system of a forest includes permanently flooded lakes and reservoirs formed by damming a river channel. It is bounded by a contour approximating the normal spillway or pool elevation.
Lake
An inland body of standing water, an expanded part of a river, or an impoundment formed by a dam. "Small lakes" are fishing impoundments, usually 5 to 25 acres (2 - 10 hectares) in area.
Land
A term denoting the entire complex of surface and near-surface attributes of the solid portions of the surface of the Earth which are significant to people. Water bodies occurring within landmasses are included with land. A specific area of the Earth's surface. Its characteristics embracing all reasonably stable, or predictably cyclic attributes of the biosphere directly above and below this area including those of the atmosphere and climate, the soil and underlying geology, the topography, the hydrology, the plant and animal populations, and the results of past and present human activity, to the extent that these attributes exert a significant influence on present and future uses of the land by people. It is all but the purely socioeconomic (human) attributes of the environment. It is assumed that all approaches to interpretative land classification would, to a varying extent, take additional socioeconomic factors into account but these are not considered to be attributes of the "land" itself. "Land" is a broader concept than soil. Within economic theory it is one of the major factors of production consisting of a good that is supplied by nature without the aid of people. The term may include not only the Earth's surface, both solid land and water, but also anything that is attached to the Earth's surface. Thus, all natural resources in their original state, such as mineral deposits, wildlife, timber, and fish are land; so are sources of energy, outside of people themselves, such as water, coal deposits, and the natural fertility of the soil.
Land,Alienated
Lands of one ownership enclosed within the boundaries of another ownership. Often refers to land in private ownership within the boundaries of public land.
Land and Water System
One of the six "systems" established by the U.S. Forest Service to have a systematic, orderly way to view and evaluate its many diverse but interrelated activities. The role of this system is to protect, conserve, and enhance the basic resources of air, soil, and water on forest and rangeland. It provides the base on which the other resources grow. Activities on National Forest land include land-use planning, administration of special land uses, easements, and land adjustments, and management of mineral areas in addition to the protection, conservation, and enhancement role. The six "systems" are "Land and Water", Timber Resource, Outdoor Recreation and Wilderness, Rangeland Grazing, Wildlife and Fish Habitat, and Human Community Development.
Land Capability
The inherent ability of land to be used without permanent damage. Land capability, as ordinarily used in the United States, is an expression of the effect of physical land conditions, including climate, on the total ability to be used without damage for crops that require regular tillage, for grazing, for woodland, and for wildlife. Land capability involves considering (1) the risks of land damage from erosion and other causes and (2) the difficulties in land use owing to physical land characteristics, including climate.
Land Capability Class
One of the eight classes of land in the land capability classification system of the Soil Conservation Service, now the Natural Resource Conservation Service. The eight land capability classes in this system are distinguished according to the risk of land damage or the difficulty of land use. The first four classes distinguish land inherently able to be used for cultivation and other uses. Soils in Class I have few limitations that restrict their use. Soils in Class II have some limitations that reduce the choice of plants or require moderate conservation practices. Soils in Class III have severe limitations that reduce the choice of plants or require special conservation practices, or both. Soils in Class IV have very severe limitations that restrict the choice of plants, require very careful management, or both. The second four classes distinguish land generally inherently unable to be used for cultivation (without major treatment). Soils in Class V have little or no erosion hazard but have other limitations, impractical to remove, that limit their use largely to pasture, range, woodland, or wildlife food and cover. Soils in Class VI have severe limitations that make them generally not able to be used for cultivation and limit their use largely to pasture or range, woodland, or wildlife food and cover. Soils in class VII have very severe limitations that make them not able to be used for cultivation and that restrict their use largely to grazing, woodland, or wildlife. (VIII). Soils and landforms in class VIII have limitations that preclude their use for commercial plant production and restrict their use to recreation, wildlife, water supply, or aesthetic purposes.
Land Capability Classification
A grouping of kinds of soil into special units, subclasses, and classes according to their capability for intensive use and the treatments required for sustained use.
Land Capability Map
A map resulting from capability classification showing land capability units, land capability subclasses, and classes or a soil survey map.
Land Capability Subclass
Groups of land capability units within classes of the land capability classification system that have the same kinds of dominant degree and kind of limitations for agricultural use as a result of soil and climate, e.g., some soils are subject to erosion if they are not protected, while others are naturally wet and must be drained if crops are to be grown. Some soils are shallow or droughty or have other soil deficiencies. Still other soils occur in areas where climate limits their use. The four kinds of limitations recognized at the subclass level are risks of erosion; wetness, drainage, or over flow; other root zone limitations; and climatic limitations.
Land Capability Unit
A group of soils that are nearly alike in inherent ability to be used for plant growth and in their responses to soil management. Capability units provide more specific and detailed information application to specific fields on a farm or ranch than the "subclass" of the land within a capability classification.
Land Classification
Land classification is the process whereby the complex of surface and near-surface attributes of the solid portions of the Earth's surface are identified and organized into some system of mappable units according to a set of criteria or principles of relatedness. "Land classification" creates a framework of generalization about the complexity of "land" properties which enables common characters (primarily for named uses) to be defined and described and units with similar properties to be regarded as equals although geographically separate. Classification, before computers, was a prerequisite to any transfer of knowledge about the relationships between land properties and land use suitability and capability from one unit to others, i.e., if there was to be predictability in land use planning. Computer mapping allows the characteristics of each small land unit to be analyzed, usually reducing the need for or utility of prior classification.
Land District
A relatively homogeneous unit of land characterized by a distinctive pattern of relief, geology, geomorphology, and regional vegetation. This is the second largest of the four classification levels of the Canadian Biopysical Land Classification system. The largest unit is the land region and the two smaller units in order of decreasing size are land system and land type.
Land Evaluation (Terrain Evaluation)
The assessment of the inherent capability and managed suitability of land for people's use in agriculture, forestry, engineering, hydrology, regional planning, recreation, etc.
Land Form
Sometimes used when referring only to the three dimensional shape of the ground surface -- without any reference to the processes responsible for that shape. "Land form" may have a different meaning than landform when used in geomorphological contexts. "Land form" is always used for surface features, the origin of which can be attributed to particular geological processes or structures. A type of land surface which exist as a result of geological activity, such as a plateau, plain, basin, or mountain.
Land Management
The intentional process of planning, organizing, programming, coordinating, directing, controlling, and adapting land use actions to achieve stated objectives.
Land, Marginal
Land of questionable abilities to be used economically for a specific purpose.
Land Region
An area of land with a certain type of vegetation that manifests a distinctive climate. This is the largest unit of the four classes of the Canada Biophysical Land Classification System. The other three classes in order of decreasing size are land district, land system, and land type.
Land Resource Area
Broad geographic areas having similar soil, climatic, geologic, vegetative and topographic features, and intensities of problems in soil and water conservation (larger than a land resource unit and smaller than a land resource region).
Land Resource Region
A generalized grouping of land resource areas reflecting regional relationships to agriculture with emphasis on soil and water conservation.
Land Resource Unit
A subdivision of a land resource area with emphasis on a specialized type of agriculture, intensities, or problems in soil and water conservation. It has a narrower range in relationship to agriculture (than a land resource area) with emphasis on soil and water conservation.
Land, Submarginal
Land that does not return enough to pay costs of ownership or operation for a specific use.
Land System
(1) An area of land with a recurring pattern of landform having homogeneous soil characteristics and supporting a particular type of vegetation. (2) The second smallest of the four classification levels of the Canada Biophysical Land Classification System.
Land Systems Inventory
A land classification system based on geomorphic principles. It is based on an understanding of geologic structure, land form genesis and geomorphic processes (as reflected in land surface form and features), individual kinds of soil and the factors which determine the behavior of ecosystems (i.e., climate, vegetation and animal life, relief, parent materials and time). The hierarchical levels in the "land systems inventory" classification scheme are: (1) the "physiographic province" (a division of the land in which the pattern of topographic elements of altitude, relief and type of land forms are uniform throughout an area of several thousand square miles or larger); (2) the "section" (land units in which the combined factors of geologic structure, geomorphic processes, climate and time have been essentially the same and thus produced a uniform pattern of topography over areas of hundreds to several thousand square miles); (3) the "subsection" (the smallest land unit which can be identified using the basic criteria of uniform geologic factors and climate operating over time to delineate essentially uniform areas of tens to hundreds of square miles); (4) the "land type association" (units tens of square miles in size over which the uniformity of geomorphic processes has produced different types of landscapes which can be visually identified on maps, air photos or on the ground); (5) the "landtype" (visually identifiable unit areas of a tenth to one square mile resulting from homogeneous geomorphic and climatic processes which have produced defined patterns of soils and vegetation potentials); (6) the "landtype phase" (0.01 to 0.1 square mile areas delineated on the basis of being characterized by uniform, specific kinds of soils or soil phases or sometimes on the basis of physiographic, vegetative or bedrock characteristics) and; (7) the "site" (areas of less than an acre defined and characterized by the occurrence of individual kinds of soils or discrete plant communities.)
Land Tenure
The holding of land and the rights that go with such holding, including all forms of holding from fee simple title (embracing all possible rights within the general limitations imposed by the government) to the various forms of tenancy of group ownership with allocation procedures, various kinds of lending possibilities, etc.
Land Type
An area of land Canada Biophysical Land Classification System having a fairly homogeneous combination of soil features at a level corresponding to the soil series, i.e., a group of soils having horizons similar in distinguishing characteristics and arrangement in the profile and developed from the same parent material and chronological sequence of vegetation. The land type is the basic biophysical land unit that can be interpreted to provide land evaluation data useful for planning and development. The mapping scale at the land type level ranges from 1/20,000 to 1/10,000. The dominant ecological variables are soil moisture regime, physical and chemical soil properties, and micro-topography. The related units in order of decreasing size are land region, land district, land system, and land type.
Land Units
A portion of a landscape unit, i.e., physiographic site types and physiographic site phases having been grouped into 16-sq. mi. minimum units, with special significance for a specific use.
Land Use
The occupation or reservation of land or inland water for any human activity or any defined purpose. It also includes use of the air space above the land or water.
Land Use Allocation
Committing a given area of land or a resource to one or more specific uses, e.g., to campgrounds, wilderness areas.
Land Use Constraints
Any factor that may act to reduce management options or discourage various uses, e.g., erosive soils, unstable slopes, steep topography, presence of archaeological or historic remains.
Land Use Plan
A coordinated composite of information, ideas, policies, programs, and activities related to existing and potential distribution and uses of land within a given area, and stating how objectives will be achieved. It identifies where activities take place or where additional activities could take place under future conditions or circumstances. It provides the basis for the complete coordination of existing and future programs and activities with adjoining lands.
Land Use Planning
To create land use plans. It is the continual process of organizing the development and use of lands and their resources in a manner that will best meet the needs of people over time while maintaining maximum flexibility for a dynamic combination of desired resource outputs for the future. It includes inventorying and assessing the status, potentials, and limitations of a particular area and its resources; interacting with the populations associated and/or concerned with the area to determine their needs, wants, and aspirations for the future; hypothesizing patterns of use compatible with both the area's capabilities and human needs and wants; proposing and assessing the consequences of, and implementing the best of alternatives for achieving the desired patterns of use, documenting the history of use to enable comparison of expected and experienced consequences; and repeating the entire process making adaptations for changing environmental status, technology, and human wants.
Land Use Policy and Planning Assistance Act
U.S. Senate bill 268, 93rd Congress, a proposed act defeated in committee in February 1974. The Congress, recognizing that the Nation's land is its most valuable national resource and that the maximum benefit to all from this resource can be achieved with the development and implementation of sound and coordinated land use policies, declares that it is the continuing policy of the Federal government to cooperate with and render assistance to state and local governments in the development and implementation of the policies which will govern the wise and balanced use of the Nation's land resource. The purpose of this Act was to establish a National land use policy, to authorize the Secretary of the Interior to make grants to assist the states to develop and implement state land use pro grams, to coordinate Federal programs and policies which have a land use impact, to coordinate planning and management of Federal lands and planning and management of adjacent non Federal lands, and to establish an office of land use policy administration in the Department of the Interior. The purpose of the Act was to encourage comprehensive, balanced, not functional, planning. Thus, whenever levels of government below the state government are to be included in the important decision making and financial assistance activities in the Act, the language of the Act limits the governments involved to general-purpose local government.
Land Use Practice (Discrete Land Use Operation)
The various kinds of altering actions and/or activities associated with or utilized in facilitating or making possible different types of land uses, e.g., clearing of vegetation, land grading, paving, landscaping, fencing, fertilizing, irrigating, etc. "Land use practices" are distinct from land use types. "Land use types" is a classification system based on the purpose for which the land is being used, e.g., timber production, range, second home subdivisions, etc. "Land use types" are bundles of more or less shared "land use practices" -- though the precise types and amounts of practices that are utilized in conjunction with a specific use type may vary from one specific instance to another. "Land use practices" is an alternative to "land use types" as a way of classifying for study and/or regulation the problems created by use. By restricting practice alternatives the problems associated with specific uses can sometimes be eliminated or reduced while not necessarily preventing use-- because there may be an alternative acceptable practice.
Land Use Survey
A survey of the uses to which land is put in a particular area, usually summarized both in map form and statistically.
Land Use Type (Land Use)
The primary use of a tract of land, e.g., crops, pasture, forest, urban, and other.
Landline
A property boundary.
LANDSAT
A satellite telemetry system used to relay images of Earth frequently from space.
Landscape
A total part of Earth (or other planets), a composite of all of the characteristics that distinguish a certain area on the Earth's surface from other areas. An expanse of Earth typically seen within one viewing, but often a large Designated area on a map somehow different than contiguous areas.
Landscape, Canopied
The type of visual landscape to be found under an extensive, continuous crown cover of trees -- as within a forest. The overhead foliage and branches define the ceiling plane and the perspective closure of tree stems or screens of understory shrubs and young trees or landforms define the side enclosures. This is one of the six general types in Litton's (1968) scenic composition classification system. The others are panoramic landscape, feature-dominated landscape, enclosing landscape, focal landscape, and detailed landscape.
Landscape, Cultural
The natural landscape modified by human occupation.
Landscape, Detailed
The close view of objects or features, particularly surface characteristics, color, or touchable nature. There is little or no sense of space and attention is restricted to the intimate details of features.
Landscape Ecology
The study of spatial and temporal variety (heterogeneity) in the structure, dynamics, and relations of plants, animals, (including people), and landscape elements at a large scale.
Landscape, Enclosing
A small outdoor space (rather than strictly a view type) with definite visual sidewalls or edge lines (formed by terrain, tree, lake or meadow surfaces) which enclose or define the field of vision. The viewer has a sense of presence by being within the foreground that is below the tops of the sidewalls.
Landscape, Feature-dominated
A view in which a single feature (or landmark), either natural or made by people, dominates the landscape because of sharp contrast with the general surroundings.
Landscape, Focal
A view characterized by convergent lines which lead the eye to the principal point of their apparent origin.
Landscape Management
Planning, administering, and controlling the use and development of land so that the visual effects maintain or upgrade people's psychological welfare.
Landscape, Panoramic
An area with an unobstructed or complete view or a continuous series of scenes extending to the distant horizon. The visual feeling is one of expanding or unbounded space, receding directly ahead toward the limits of distance on visibility and also extending laterally to the limits of peripheral vision. Although indicating the availability of a view in every direction, inherent physiological limitations on the extent of what an observer can see without turning the head suggests that a possible view of 180 degrees is a more likely condition for defining a "panoramic landscape". The term is reserved for distant or background scenes which are under observation, not horizontal scene compositions in the middle ground or foreground.
Landscape Planning
A portion of the land use planning process which deals with large-area physical (i.e., biological, geological and hydrologic) values, aesthetic and cultural (i.e., historical and anthropological) values, and with the relationships among these values and land uses.
Landscape Unit
A grouping of physiographic site types and physiographic site phases into large (16 sq. mi. minimum) units to facilitate making large-scale planning decisions.
Landslide (Landslip)
Downslope movement of a relatively dry or coherent mass of earth and/or rock along an interior surface slope at a rate fast enough to be readily perceived. Movement of a wet mass is called a mudslide.
Landslide Hazard
Some evaluation (qualitative and relative to adjacent locations) of the probability that a landslide will occur on a given site. A distinction needs to be made between occurrence and time of occurrence.
Lands Suitable for Grazing or Browsing
Lands with vegetation that can be used by domestic and wild herbivores without damage to the soil and water resource values.
Landtype (Watertype)
Units created by isolating areas of differing landform, geologic composition and water content within the site region. A "landtype" is a subdivision of a "site region" and determined by certain soil properties (such as texture depth, mineral composition, water content, etc.), climate, and the nature of parent material in large-scale land features. Landtype units range in size from about one-tenth to one square mile. Their size and composition depend upon the significance of physical characteristics that can be readily interpreted to identify hazard, capability, and productivity potentials that are reliable for land use planning purposes.
Large Scale Development
Private development on non-Federal lands which, because of its magnitude or the magnitude of its effect on the surrounding environment, is likely to present issues of more than local significance. Factors may include the amount of pedestrian or vehicular traffic likely to be generated; the number of persons likely to be present; the potential for creating environmental problems such as air, water, or noise pollution; the size of the site to be occupied; and the likelihood that additional or subsidiary development will be generated.
Late Forest Succession
A stage of forest succession when the majority of trees are mature.

See Wiki Law for relevant law research work.

Law, Common (Precedent Law)
A body of rules based on judicial decisions rather than legislation. It is the basis of the Anglo American legal tradition. The "common-law" judge relies on judicial decisions of the past in rendering rulings. Under the "common-law" approach, the law can change gradually at the hands of the judges to meet the changes in society. In the United States, the "common-law" system is evident in the supremacy of the judiciary in determining the constitutionality of legislation. In contrast, the system of civil law prominent in Europe is based on Roman law and later codes of legislation.
Law Enforcement Training
Level l - An orientation level of training (e.g., 8 hours) to familiarize employees with agency or owner law enforcement program and policies. Level II - A training level (e.g., 40 hours minimum) for employees whose duties include routine involvement in enforcement activities including issuance of violation notices and preparation of brief case reports. Level III - Advanced law enforcement training (additional 80 hours minimum) for employees who are involved in enforcement and investigative duties. Level IV - Full range law enforcement training (e.g., minimum 300 hours) for employees with an unusual heavy and complex law enforcement workload who may be exposed to significant risk of personal injury. Special Agent - Specialized training for advanced law enforcement. The investigator course at a law enforcement training center is required.
Law, Natural
An abstract concept of law based on the relation between God, people, and nature. An ideal higher than law made by people, it forms the basis of justice in the ethical sense. It embodies such ideas as the existence of a universal order governing all people and the unalienable rights of the individual. It is derived from nature and binding upon human society in the absence of or in addition to institutional law.
LD50
See Median Lethal Dose.
Leachate
Liquid that has percolated through a medium and has extracted dissolved or suspended materials from it.
Leaching
The removal of materials in solution by the passage of water through a solid medium, e.g., through soil or overburden.
Leasable Minerals
Coal, oil, gas, phosphate, sodium, potassium, oil shale, and geothermal steam.
Least Cost
The minimum cost that must be accrued to meet specified goals and objectives.
Left-justified
A string of characters, such as a title, positioned within a column in such a way that its first character falls in the left-most position of the column.
Legal Institution
A society's system of legal rules, principles, and agencies.
Lentic
Pertaining to standing (nonflowing) waters such as lakes, reservoirs, ponds, and swamps.
Leontief Analysis
See Input-output Analysis.
Lexicography
A method of choosing among alternatives based on an analogy to the way words are arranged in a dictionary. A single objective or attribute is rated as most important, and alternatives are ranked according to how well they satisfy this objective. If an alternative is clearly superior in this attribute to other alternatives it is selected. Otherwise the second most important attribute is used to rank the top alternatives from the first ranking. This process continues, constantly reducing the number of alternatives ranked and ranking by less important attributes, until a single project is clearly superior for the attribute being used to rank the alternatives.
Life Cycle
The successive stages through which an organism passes from the spore or fertilized egg of one generation to the spore or fertilized egg of the next generation. A continuous, descriptive account of a life cycle is called the life history of an organism.
Life Style
A characteristically different way of living which may be an individual variant within the cultural main stream or may be an individual expression of a subculture. "Life styles" are generally expressed through the means of economic sustenance, dwelling site and type, types of group associations, and social practices such as family form, religious practices, sexual mores, style of dress, type of diet, etc.
Life Zone
An altitudinal, latitudinal, or climatic region or belt with distinctive faunal and floral characteristics, type of animal and plant life found in them -- e.g., the Upper Sonoran, Transition, Canadian, Hudsonian, and Alpine life zones.
Limiting Factor
Any environmental factor whose presence, absence, or abundance is the main factor restricting the distribution, numbers, or condition of an organism. A factor to which the limit of tolerance of an organism is first reached and which, therefore, acts as the immediate restriction to one or more of its functions or activities, thus its abundance and geographic distribution.
Limits
The number of livestock that may be grazed under provisions of a grazing preference.
Linear Program Model
A deterministic mathematical method (a computer program) used to determine the best use of resources to achieve a desired result and limitations on available resources can be expressed in the form of equations. The restrictions on its attainment are expressible as a system of linear equalities or inequalities (e.g., y=a+bx or a>b). There are linear behavioral relationships and an optimal solution is sought (by maximizing or minimizing a system output) subject to limits or constraints.
Litter (Forest Litter, Leaf Litter)
The uppermost layer of organic debris on the ground under a vegetation cover, i.e., essentially the freshly fallen or only slightly decomposed vegetable material, mainly from foliage but also bole, bark fragments, twigs, flowers, fruits, etc.
Littoral
Belonging to the shore of seas and the Great Lakes; the word applied loosely and generally to the seashore as well as to the shores of lakes and rivers.
Lobbying
Activity engaged in by individuals or organizations (directly or through hired representatives) that is directed to elements of government in an attempt to influence legislation or policies in a way that is favorable to the interests of the lobbying group.
Local Analysis
A characterization of the ecological, social, and economic components for various times and locations for a smaller area than that of a broad-scale assessment. Local analyses often tier to broad-scale assessments. Local analyses provide comprehensive descriptions of ecological system structure, process, and functions. The geographic area of a local analysis and its data resolution depend on the topics of general interest orconcern being addressed. Like broad-scale assessments, local analyses represent a synthesis of current scientific knowledge including a description of uncertainties and assumptions; however, they also provide for the gathering of new information which can be used in developing site-specific projects.(USFS 1999)
Local Economic Effects
Effects of an action or inaction in the resource area on financial transactions in the immediate area of the action or inaction. The "local" area would include an area encompassing the primary sources of employment and retail outlets for basic commodities such as food utilized by the people of that area.
Local Overgrazing
Overgrazing in localized areas on range, as, for example, near watering places.
Local Road
Roads and trails constructed and maintained for, and frequently by, the single-purpose activities. They connect terminal facilities with forest arterial roads or public highway. Their location and standard are usually determined and controlled by a specific resource activity rather than travel efficiency. Forest local roads may be developed and operated for either long-term or short-term service.
Location (Mineral Location)
The acts of the general mining laws by which the right of exclusive possession of locatable mineral deposits is vested in the locator. A "mining claim" may refer to a parcel of land containing soil or rock which has value because of its chemical composition, while "location" is the act of appropriating such land according to certain established rules.
Location Theory
The theory which attempts to explain and predict the location of individual, commercial, and industrial development. It is important to the planner for predicting population and industrial distribution that would result from alternative plans.
Log
A piece of the woody stem of a tree. The trunk portion of a tree used for sawlogs. Typically 16 feet long. A tree with 1 and a half logs has a 24-foot bole before major limbs or a minimum diameter limit are encountered.
Log Deck
Also called log landing, log yard, brow or bunching area. A place where logs or tree-length material is assembled for loading and transporting.
Log Rule
A device, usually presented in tabular form, which expresses log volume content based on log diameter (inside bark of the small end) and length. A log rule expresses the volume of cut logs. A tree rule expresses the volume of standing trees.
Log Scale Sale
Timber sold in terms of dollars per unit volume removed.
Logged-over Forest
A forest in which most or all of the merchantable timber has been removed.
Logging
Cutting and extracting timber, particularly logs and pulpwood. "Harvesting", beyond removing logs, may be expanded to include the cutting, initial processing if any, and extraction of any forest product.
Logging, Aerial
A system for hauling timber from the stump to a collecting point that employs aerial means of transportation, e.g., balloons or helicopters.
Logging, Cable
A method for transporting logs from stumps to collecting points, one utilizing a cable system as the main device for moving them.
Logging Debris (Slash)
That unwanted, unutilized, and generally unmarketable accumulation of woody material in the forest such as limbs, tops, cull logs, and stumps, that remain as forest residue after timber harvesting.
Logging, Ground-lead (Low-lead Cable Logging)
A method for transporting logs from the stumps to a collecting point by dragging them along the ground with a powered cable passing through a block fastened close to ground level.
Logging, High-lead
A method for transporting logs from the stumps to a collecting point by using a powered cable, passing through a block fastened high off the ground, to lift the front end of the logs clear of the ground while dragging them.
Logging, Skyline (Skyline Yarding)
A method for transporting logs from stumps to collecting points that uses a heavy cable stretched between high points (such as in tall trees braced with guy lines) to functions as an over head track for a load-carrying trolley. Logs are lifted by cables or other devices attached to the trolley and powered cables are used to move the load back and forth along the main cable (a particular type of cable logging).
Logging, Tractor
Any logging method that uses a tractor as the power for transporting logs from the stumps to a collecting point, whether by dragging or carrying the logs.
Logical Entry
All the data about a single major item in a database. (For instance a data collection site.)
Long-Term
Action governed by a plan generally taking place over a period (specified) longer than 20 years from the present.
Long-term Effects
Those effects that generally occur after 20 years.
Long-range Planning
Planning for a system for a period from the present of at least 50 years.
Long-Term Sustained Yield Timber Capacity
The highest uniform wood yield from lands being managed for timber production that may be sustained under a specified management intensity and set of constraints and objectives.
Lop
1) To chop branches, tops, or small trees after felling so that the slash will lie close to the ground. 2) To cut the limbs from a felled tree.
Lotic
Flowing waters, including creeks, streams, and rivers.
Lumpsum Sale
Timber sold for a fixed amount for all of the wood in a given area. Payment is based on the appraised value of the tract, distinguished from a sale in which payment is based on the volume harvested and scaled.


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Last revision January 17, 2000.