- Silvicultural activity: That directed at the cultivation and maintenance of natural or artificial forests.
- Forest tree: Understood as a woody plant, composed of roots, stems, branches, and leaves, whose main objective is to be used for producing timber suitable for sawing boards, veneers, charcoal, firewood, matchsticks, cellulose, essential oils, resins, tannins, and others.
(The above definition thus amended by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Aquifer recharge area: Those land surfaces where the majority of infiltration that feeds a specific aquifer occurs.
- Forest areas: Those lands with forest suitability, whether covered or not by forest.
- Wildland areas (Areas silvestres): Those established as Forest Reserves, National Parks, Protective Zones, Wildlife Refuges (Refugio de Fauna Silvestre), and Biological Reserves and similar areas.
- Mobile sawmill: A mobile sawmill is understood as all sawing equipment that, due to its characteristics and size, can be moved quickly and at low cost from one place to another, in order to operate, where possible, directly at the sources of raw material supply in log form, residual timber, plantation forest timber, and timber of diameters not used in conventional sawmills, which will allow for increased utilization of the forest resource; the use of chainsaws for sawing is excluded from this definition.
(The above definition thus added by Article 1 of Executive Decree No. 20099 of November 2, 1990) - Portable sawmill: A portable sawmill is understood as all sawing equipment that consists of a chainsaw and a frame, which, due to its characteristics and size, can be moved from one place to another in order to operate directly at the source of residual raw material, which will allow for increased utilization of the forest resource.
(The above definition thus amended by Article 1 of Executive Decree No. 20099 of November 2, 1990) - Intervened forest (Bosque intervenido): That in which extraction actions of forest products such as timber, heart of palm, and others have been carried out, causing considerable alterations to its original structure and floristic composition.
- Managed natural forest (Bosque natural manejado): That forest whose interventions directed by humans are carried out under technical criteria that allow for the sustainability of the resource, permanently producing tangible and intangible benefits.
- Primary forest (Bosque primario): A formation that has not suffered alterations by direct human action, especially regarding the extraction of major forest products such as timber, heart of palm, and others.
- Secondary forest (Bosque secundario): That forest mass that develops naturally after the total or partial disappearance of a previous one, often with differences in the composition of the tree mass it replaces.
- Public utility catalog (Catálogo de utilidad pública): The list of properties belonging to the State Forest Heritage (Patrimonio Forestal del Estado), where their location, boundary demarcation (deslinde), area, registration data, various annotations, and respective maps shall be recorded.
- Management categories (Categorías de manejo): The alternative or form of management applied to a wildland area to meet specific natural and/or cultural resource conservation objectives, in order to produce socioeconomic and ecological benefits for the inhabitants.
- Forest Corporations or Cooperatives: For the purposes of these regulations, all those non-profit private entities, duly registered, whose main objective is the development of forest activities.
(The above definition thus amended by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Hydrographic basin (Cuenca hidrográfica): That territorial unit of variable land surface, defined by a water divide crest and whose waters drain towards a common outlet. Highly dynamic and interrelated biological, economic, natural, and social processes occur within it.
- Charral: Plant formation constituted by herbaceous, woody, and occasionally arboreal invasive species, one to three years old, not exceeding five meters in height, which grows on deforested and subsequently abandoned lands. Generally, the area was previously dedicated to agricultural crops or livestock. May contain some scattered usable trees of various sizes, and its economic potential depends on the species present.
- Dendroenergy: The utilization of wood for energy purposes.
- Integrated industrial development: Understood as industrial development that ensures a forest-industry integration as a single production unit, seeking better utilization and perpetuity of the forest resource.
- Artificial reservoirs and lakes (Embalses y lagos artificiales): Those bodies of water that have been formed by man, through the damming of fluvial and/or rainwater for subsequent use in different purposes. For the purposes of these regulations, artificial lakes are considered those with an area greater than two hectares.
- FOREST INDUSTRY: All transformation processes that use roundwood as raw material for obtaining forest products.
(The above definition thus amended by Article 1 of Executive Decree No. 24740 of September 28, 1995) - National Forest Inventory (Inventario forestal nacional): The set of records of basic information on timber stocks and other natural resources, in both natural and artificial forests throughout the entire country.
- Block timber: (This definition thus repealed by Article 2 of Executive Decree No. 24740 of September 28, 1995) (The above definition thus added by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Raw material (Materia prima): All that timber generated as a byproduct of the forest, forest plantations (plantaciones forestales), pastures (potreros), charrales, and others that, due to its characteristics, can be processed in forest industries.
(The above definition thus added by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Residual raw material (Materia prima residual): All that timber generated as a remnant after a forest harvest, and which, due to its characteristics, is not profitable to process in traditional industrial processing plants.
Also included within this definition are logs in a state of deterioration, hollow logs, stumps, log tops, branches, and log ends.
(The above definition thus added by Article 1 of Executive Decree No. 20099 of November 2, 1990) (The above definition thus amended by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Natural forest management (Manejo de bosque natural): The application of a set of techniques and silvicultural systems, in accordance with the ecological conditions of the forest, aimed at its administration and ordering over time and space, whose final purpose is the sustainable production of forest products, without impairing the renewal capacity or biological and economic recovery of the forest. This last condition is basic to ensure the perpetuity of the resource.
(The above definition thus added by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Artificial methods of repopulation: Those in which man has broad participation, with or without advanced technologies. The vegetation shall be established by planting seedlings according to a reforestation plan. These methods generally define homogeneous forests, at least regarding species and ages, in which the trees are generally distributed in defined rows, forming compact blocks or rows in the form of windbreaks.
- Natural methods of repopulation: Those in which there is little participation by man and little technology, since vegetation will be established randomly by natural succession, from which man may select the species considered suitable for management. These methods generally define heterogeneous forests regarding species, volume, and ages, without the trees being distributed in perfectly defined lines. Man's participation will consist of executing selective activities eliminating undesirable vegetation, eventually participating in seed dispersal, or planting some trees within the existing natural succession vegetation.
- Plots dedicated to recreation: Those plantations understood to have as their main purpose beautification and leisure, in sports areas, urban areas, among others.
- Management plan for a wildland area (Plan de manejo de un área silvestre): The set of technical standards that will regulate the activities to be developed in a forest reserve, protective zone, national park, national wildlife refuge, biological reserve, and related areas, for their use, conservation, management, and development.
- Forest plantation (Plantación forestal): That established on land with one or more tree species, where the main but not sole objective will be timber production.
(The above definition thus added by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Predominance of trees (Predominación de árboles): "All those plant associations whose commercial basal area of the trees is not less than ten square meters per hectare or where there exist at least twenty trees per hectare of commercial species with a diameter at breast height (dbh) greater than twenty centimeters." (The above definition thus added by Article 1 of Executive Decree No. 22024 of February 24, 1993) - Burn (Quema): Understood as a burn voluntarily provoked with a plan, including in treatments of cutting waste, for the purpose of limiting it to a previously determined area.
- Industrial rationalization: The system that allows determining, according to market forces, the minimum necessary quantity of raw material for the forest industry to operate efficiently.
- Reorganization and relocation of the industrial forest sector: The ordering process necessary to ensure forest-industry integration, better utilization of the resource, and closer distances to raw material sources.
- National reserves (Reservas nacionales): Those lands included within the limits of the Republic that are not registered as private property, municipal property, or property of autonomous institutions, that are not protected by ten-year adverse possession, those that by special laws have not been destined for the formation of agricultural colonies, and in general all those that, not being private property, are not occupied in public services.
- Permanent rivers, ravines, or streams (Ríos, quebradas o arroyos permanentes): Those that maintain water flow all year.
- Tacotal: Plant formation constituted by herbaceous, woody, and arboreal species of greater height and age, originating from the abandonment of agricultural areas or pastures. It is generally constituted by pioneer species with rapid growth, and its economic potential depends on the species present. It has the same origins as the charral and may contain scattered usable trees of various sizes and species, which generally do not exceed fifteen meters in height.
(The above definition thus amended by Article 1 of Executive Decree No. 20618 of July 12, 1991) - Flat lands (Terrenos planos): For the purposes of the stipulations in Article 68 of the law, flat lands are considered those whose slope is equal to or less than thirty percent.
(The above definition thus amended by Article 1 of Executive Decree No. 20993 of November 15, 1991) - Steep lands (Terrenos quebrados): Those that have a slope greater than thirty percent.
(The above definition thus amended by Article 1 of Executive Decree No. 20993 of November 15, 1991) - LOG OR ROUNDWOOD: A log is understood as the section of the tree free of branches, having a diameter greater than or equal to 29 centimeters at the thinnest end and a minimum length of 2 meters." (The above definition thus amended by Article 1 of Executive Decree No. 24740 of September 28, 1995) - Cutting cycle (Turno de corta): The time elapsed from when the plantation or regeneration of forest species is established until their harvest age.
- Rational use of renewable natural resources (Uso racional de los recursos naturales renovables): The employment of techniques that allow for the continued and sustained use of renewable natural resources.
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