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Glossary of Forestry Terms

The following will be an indexed compendium of forestry terms, each term described either from a source, or by my own interpretation of the term. Each description will be marked with a source code, which are listed on another page.

Index: A B C D E F G H I J K L M N O P Q R. S T U V W X Y Z

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Codes: (*) My simplification    (a) Silvicultural Terms in Canada

Afforestation (a): The establishment of a tree crop on an area from which it has always, or for a very long time, been absent.

Agroforestry (me): Forestry and agriculture being carried out on the same land area.

Basal Area (*):

  1. Of a tree: The cross sectional area of a stem at breast height

  2. Of a forest: the accumulated area of stem cross sections per unit area of land e.g. square metres per hectare.

Breast Height (a): The standard height, 1.3 metres above ground level, at which the diameter of a standing tree is measured.

Canopy (a): The more or less continuous cover of branches and foliage formed collectively by the crowns of adjacent trees

Coppice (a): Natural regeneration originating from stump sprouts or root suckers.

Crown Class (*): refers to the relative level of the tops of trees, or groups of trees, in the canopy of a forest. They are differentiated mainly by how much light a tree can receive, and from what direction - from above, from the side etc.

  •  Superdominent or Predominant (me): refers to trees whose entire crown have grown above the general canopy level. The entire crown can receive direct sunlight.

  •  Codominant (a): trees with crowns forming the general level of the main canopy, receiving full light from above and comparatively little from the sides.

  •  Dominant (a): trees with crowns extending above the general level of the main canopy and receiving full light from above and partial light from the sides.

  •  Intermediate (a): trees with crowns extending into the lower portion of the main canopy, but shorter in height than the codominants; receiving little direct light from above and none from the sides.

  •  Suppressed (a): trees with crowns entirely below the general level of the canopy receiving no direct light [from any direction].

  •  Open Grown (a): trees receiving full light from all sides due to the openness of the canopy.

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