Difference between revisions of "Variable:SiteIndexH (SIH)"
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| − | Variable SiteIndexH (SIH) is a computed value for H100, i.e. [[Variable:Dominant_Height|dominant height]] at an "imagined" age of 100 years. | + | ==Usage== |
| − | Sweden, Scandinavien Journal of Forest Research 11:38-49. </ref>). SiteIndexH is computed as the arithmetic mean height of dominant trees when each of these tree is 100 years old (50 years for birch). | + | Variable SiteIndexH (SIH) is a computed value for H100, i.e. [[Variable:Dominant_Height|dominant height]] at an "imagined" age of 100 years. SiteIndexH is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that a dominant species has at least 70 % of the basal area. |
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| + | ==Definition== | ||
| + | SiteIndexH is derived from site index equations. The site index equations gives the height ''h'' at age ''a'', given initial height ''h0'' at age ''a0''. For young stands SiteIndexH could be higher that SIS (site index determined from site factors) (cf. <ref>Elfving B och Nyström K, 1996. Yield Capacity of planted Picea abies in Northern | ||
| + | Sweden, Scandinavien Journal of Forest Research 11:38-49. </ref>). | ||
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| + | SiteIndexH is computed as the arithmetic mean height of dominant trees when each of these tree is 100 years old (50 years for birch). When dominant trees are 100 years old (at a stand age close to 100 years), result variables [[Variable:Dominant_Height |dominant height]] and SiteIndeH should be about the same. | ||
==References== | ==References== | ||
<references /> | <references /> | ||
Latest revision as of 15:39, 26 February 2016
| Name: | SiteIndexH (SIH) |
|---|---|
| Description: | SiteIndexH (SIH) |
| I/O: | Output variable (prognosis) |
| Membership: | Treatment unit |
| Type: | real |
| Unit/values: | (m) |
| Database table: | dbo.Result_ForestData |
Usage
Variable SiteIndexH (SIH) is a computed value for H100, i.e. dominant height at an "imagined" age of 100 years. SiteIndexH is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that a dominant species has at least 70 % of the basal area.
Definition
SiteIndexH is derived from site index equations. The site index equations gives the height h at age a, given initial height h0 at age a0. For young stands SiteIndexH could be higher that SIS (site index determined from site factors) (cf. [1]).
SiteIndexH is computed as the arithmetic mean height of dominant trees when each of these tree is 100 years old (50 years for birch). When dominant trees are 100 years old (at a stand age close to 100 years), result variables dominant height and SiteIndeH should be about the same.
References
- ↑ Elfving B och Nyström K, 1996. Yield Capacity of planted Picea abies in Northern Sweden, Scandinavien Journal of Forest Research 11:38-49.