Difference between revisions of "Variable:Dominant Species"
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Dominant species is used to determine | Dominant species is used to determine | ||
*what species to include when computing [[Variable:Dominant Height | dominant height]], which is used as input to thinning guide. | *what species to include when computing [[Variable:Dominant Height | dominant height]], which is used as input to thinning guide. | ||
| − | *what species to compute SiteIndexH for. SiteIndexH represents site index H100 according to site index equations. It is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that the target species has at least 70 % of the basal area. | + | *what species to compute SiteIndexH for. SiteIndexH represents site index H100 according to site index equations, and is computed as arithmetic mean height of dominant height trees at age 100, which is derived from site index equations. It is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that the target species has at least 70 % of the basal area. |
==Definition== | ==Definition== | ||
Revision as of 10:47, 1 September 2011
| Name: | Dominant Species |
|---|---|
| Description: | Domainant Species. |
| I/O: | Output variable (prognosis) |
| Membership: | Treatment unit and Reference unit |
| Type: | real |
| Unit/values: | Species group code |
| Database table: | dbo.Result_ForestData (result database) |
Usage
Dominant species is used to determine
- what species to include when computing dominant height, which is used as input to thinning guide.
- what species to compute SiteIndexH for. SiteIndexH represents site index H100 according to site index equations, and is computed as arithmetic mean height of dominant height trees at age 100, which is derived from site index equations. It is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that the target species has at least 70 % of the basal area.
Definition
New stands=
Dominant Species: Regeneration species, i.e. the species that was planted.
Existing stands
Young stands: Species proportion is computed as proportion of trees. Established stands: Species proportion is computed as proprtion of basal area.
Domainant species: If number of conifers >= 500 trees/ha, or sum of conifer proportions >= 50 %, then pine, spruce or contorta is selected as dominant species depending of which is most abundant. Otherwise, if one of oak, beech, or birch >= 50 %, then that one is selected. Otherwise, "other decidouos" is selected, which includes other broad-leafs.