Glossary: O

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Term Definition French
Occlusion The process of healing of cut branch stubs by the cambium of the surrounding stem surface. Occlusion
Old field An area of cleared open land no longer used for cultivation or pasture which may be in the process of reverting to forest. Champ abandonné
Old growth A stand of mature or overmature trees relatively uninfluenced by human activity. Première venue, de
Old-growth forest An old growth forest differs significantly from younger stands in structure, ecological function and species composition with respect to canopy closure, age class structure, accumulation of woody debris and the presence of species and functional processes that are representative of the potential natural community. Forêt anciennne / vieille forêt
Ombrophilous Able to thrive in areas of abundant rainfall. Ombrophile
Open forest Proposed name for the natural forest commonly found in northern Canada. This forest is a mixture of wetlands and small trees, occasionally interspersed with highly productive forests. Forêts claires
Opening up Considerable reduction of canopy density, e.g., by lopping, felling, or herbicidal treatment of selected trees, or naturally through pests, disease, or drought mortality. Ouverture du couvert
Opportunity wood Potential woody biomass resources available for salvage following natural disturbances—for example, wood damaged by insect pests such as the mountain pine beetle, by disease, or by fire or wind — or forestry activities — for example, small-diameter or other trees left standing. In some cases, harvesting and construction residues are also viewed as opportunity wood. Bois d’occasion
Order Taxonomic level between Class and Family. In insects, for example, classification in orders is based primarily on wing shape. Ordre
Organ Group of tissues organized to perform a distinct function. Organe
Oriented strandboard (OSB) A panel made from wood strands oriented in the face layers and normally cross-oriented in the core layer, combined under heat and pressure with a water-resistant binder. Orienting the strands greatly increases the bending stiffness and strength of the panels. Panneau de particules orientées
Outplant A seedling, transplant, or cutting ready to be established on an area. Plant sur le terrain
Overmature In even-aged management, those trees or stands past the mature stage. Suranné
Overstorey The uppermost continuous layer of a vegetation cover, for example the tree canopy in a forest ecosystem or the uppermost layer of a shrub stand. Étage dominant
Overstory removal A final harvest in which the cutting releases advance regeneration. Suppression de l’étage dominant
Ovoid Egg shaped. Ovoïde
Ozone layer A form of oxygen (O3) formed naturally in the upper atmosphere by a photochemical reaction with solar ultraviolet radiation and a major agent in the formation of smog. Couche d'ozone
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