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Immature
- In even-aged management, those trees or stands
that have grown past the regeneration stage but are not yet mature.
Improvement Cutting
- A cutting made in a stand past the
sapling stage primarily to improve composition and quality by
removing less desirable trees of any species.
Increment
- The increase in diameter, basal area, height,
volume, quality, or value of individual trees or stands during
a given period.
Incremental Silviculture
- see Intensive Silviculture
Increment Borer
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A hollow auger-like instrument used to bore into the trunk of a tree to remove a cylinder of wood about the diameter of a soda straw containing a cross-section of the tree's growth rings.
Ingrowth
- The volume or number of trees that have grown
past an arbitrary lower limit of measurement during a specified
period.
Insecticide
- Any chemical or biological preparation used
to kill or disrupt the development of insects.
Integrated Resource Management
-
The deliberate and carefully planned management of a forest area taking into account the values of all resources in the area.
Intensive Forest Management
- Basic forest management plus
juvenile-stand improvement plus acceleration of artificial regeneration.
Intensive Silviculture
- Silvicultural practices in established
stands (past free-growing condition) to enhance stand value and
yield. (The term incremental silviculture is defined in
the British Columbia Forest Act and thus "intensive silviculture"
is no longer used there. In Ontario intensive silviculture may
be considered to include plantation establishment, e.g., using
genetically improved planting stock; intensive site preparation,
such as spraying herbicides to reduce competing vegetation before
mechanical preparation; manual weeding of plantations at early
stages.)
Intermediate Crown Class
- see Crown Class: intermediate
Intermediate Treatments
- Any treatment in a stand during
that portion of the rotation not included in the final harvest
or regeneration period.
Interplanting
- Planting young trees among existing natural
regeneration or previously planted trees of similar age. This
activity is known as fill-in planting in Alberta, considered
to be the same as fill planting in Ontario, and called
gap planting in Newfoundland.
Irregular Shelterwood System
- see Shelterwood Cutting
Irregular Uneven-Aged Structure
- Stands that have three
or more distinct age classes which do not occupy approximately
equal areas. Distribution of diameters is unbalanced. (Also
referred to in Ontario as multistoried stands.
Isotherm
-
Line, drawn on a climate map, connecting points of equal average temperature.
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