Difference between revisions of "Variable:SiteIndexH (SIH)"
| Line 10: | Line 10: | ||
Variable SiteIndexH (SIH) is a computed value for H100, i.e. [[Variable:Dominant_Height|dominant height]] at an "imagined" age of 100 years. It is computed by the system, 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 and 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 | Variable SiteIndexH (SIH) is a computed value for H100, i.e. [[Variable:Dominant_Height|dominant height]] at an "imagined" age of 100 years. It is computed by the system, 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 and 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>). SiteIndexH is computed as the arithmetic mean height of dominant trees when each of these tree is 100 years old (50 years for birch). For dominant trees younger than 100 years, SiteIndexH should be lesser than current dominant Height. For dominant trees 100 years old, dominant height and SiteIndeH should be about the same. For dominant trees older than 100 years, SiteIndexH should be smaller than current dominant height. | 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). For dominant trees younger than 100 years, SiteIndexH should be lesser than current dominant Height. For dominant trees 100 years old, dominant height and SiteIndeH should be about the same. For dominant trees older than 100 years, SiteIndexH should be smaller than current dominant height. | ||
| + | |||
| + | SiteIndexH is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that the [[Variable:Dominant_Species|dominant species}} proportion is at least 70 % of the basal area. | ||
==References== | ==References== | ||
<references /> | <references /> | ||
Revision as of 10:47, 1 September 2011
| Name: | SiteIndexH (SIH) |
|---|---|
| Description: | SiteIndexH (SIH) |
| I/O: | Output variable (prognosis) |
| Membership: | Treatment unit |
| Type: | real |
| Unit/values: | (m) |
| Database table: | dbo.Result_ForestData |
Variable SiteIndexH (SIH) is a computed value for H100, i.e. dominant height at an "imagined" age of 100 years. It is computed by the system, 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 and 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). For dominant trees younger than 100 years, SiteIndexH should be lesser than current dominant Height. For dominant trees 100 years old, dominant height and SiteIndeH should be about the same. For dominant trees older than 100 years, SiteIndexH should be smaller than current dominant height.
SiteIndexH is only used for presentation purposes and is not used as explanatory variable in any function. To be computed, it requires that the [[Variable:Dominant_Species|dominant species}} proportion is at least 70 % of the basal area.
References
- ↑ Elfving B och Nyström K, 1996. Yield Capacity of planted Picea abies in Northern Sweden, Scandinavien Journal of Forest Research 11:38-49.