ControlTable Production Model

See http://heurekaslu.org/help/index.html?kontrolltbl_production_model.htm

Note: The info here is a little bit out of date.

In the production model control table you can configure the simulation of the forests' development, i.e. how trees establish, grow, and finally die if not harvested before that.

Growth and yield

Allows you to control the net growth and yield from harvests, by applying certain models/-components in the simulations. : :

Growth Model Individual-Tree

Elfving implies that the model by Elfving will be used in calculation of each trees' diameter development at the plot-level (the prediction unit).

Soderberg implies that the model by Söderberg will be used in calculation of each trees' diameter development at the plot-level (the prediction unit).

Growth Model Whole-Stand

None implies that no basal area development, as the sum for all trees at the plot-level, will be used in growth calculations.

Elfving2005 implies that the model by Elfving, anno 2005, will be used in calculation of basal area development at the plot-level (the prediction unit).

Elfving2009 implies that the model by Elfving, anno 2009, will be used in calculation of basal area development at the plot-level (the prediction unit).

Growth: Include Thinning Response

True if thinning response function should be applied, false otherwise. Only applied to even-aged stands.

Growth Factor

Adjustment factor for basal area growth in established forest. Default = 1, i.e. no adjustment. Should normally not be changed, intended for research purposes.

Volume Function

Selected volume function.

Height Development Model

ErikssonElfving implies that the model by Eriksson and Elving will be used in calculation of height development.

SoderbergWithTreeAge implies that the model by Söderberg including single tree ages will be used in calculation of height development.

SoderbergWithStandAge implies that the model by Söderberg including average stand ages will be used in calculation of height development.

Height: Initial Height Function

SoderbergWithTreeAge implies that the model by Söderberg including single tree ages will be used in calculation of initial tree heights.

SoderbergWithStandAge implies that the model by Söderberg including average stand ages will be used in calculation of initial tree heights.

Height:Initial Height Source

UseFunction implies that the model selected in InitialHeightModel (above) will be used.

FromDatabase implies that initial tree heights will be obtained from an available database [The Hugin young forest-database?].

Height Calibration

True means that tree heights will be calibrated, False do not. Calibration factors are calculated using sample tree data.

Mortality Implementation

Deterministic will apply deterministic components in the mortality model (recommended).

Stochastic will apply stochastic components in the mortality model

Mortality Model

Selected mortality model. Default value for parameter "Calibrate Bengtsson" will depend on what mortality model is selected.

Mortality Factor Established Forest

Adjustment factor for mortailty in established forest (mean height > about 7 m). Default = 1, i.e. no adjustment.

Calibrate Bengtsson

Set to True if mortality rates according to Göte Bengtsson should be applied (for small basal areas), independent of selected Mortality Model. This means the mortality model is only responible for distributing mortality over trees.

Calibrate Söderberg

Set to True if the self thinning limit (for large basal areas) according to Söderberg (1986) should be applied. This means the mortality model is only responible for distributing mortality over trees.

Mortality for Retained Trees 1-5

Mortality rate for retained trees during the first 5-year period, defined per each species group.

Mortality for Retained Trees 6-10

Mortality rate for retained trees during the second 5-year period, defined per each species group.

Adjust Mortality for Retention Patches

Set to FixedMortality to let mortality in a retention patch depend (i.e. increase) if and when the main stand is clear cut. If FixedMortality is selected, mortality is set in Mortality in Retention Patches. These parameters are hidden if NoAdjustment is chosen, meaning that the mortality is not affected by a clear cut of the main stand.

Mortality in Retention Patches year ...

These parameters has the same functionality as Mortlaity for Retention Trees, but applies to whole retentions patches and edge zones if Adjust Mortality for Retention Patches = Fixed Mortality.

Site Index Ajdustment

Adjustment factor for site index. Default value = 1. Intended for research purposes.

Height Threshold Young/Mature

Defines the arithmetic mean tree height at which a "sapling" stand is considered a "mature" "tree" plot. Calculated for each plot. When at least 90% (?) of the plots are no longer sapling plots, then the stand is classified as a mature stand and not young.

Age settings

Allows you to control how different types of ages, at tree-level, should be handled in the simulations.

Year to Breast Height Model

Elfving implies that the model by Elfving will be used in calculation of the age of a tree when it reach breast height (1.3 m).

Tax implies that the model from the Swedish NFI will be used in calculation of the age of a tree when it reach breast height (1.3 m).

Calibrate Age To Register Value, Established Stands

True implies that tree ages will be calibrated so that the mean age will be as close as possible to the mean age according to the input data. False do not. Calibration is not applied if the mean age according to Heureka differs by more than 30 % to the input data.

Calibrate Age To Register Value, Young Stands

True implies that sapling ages will be calibrated. True if computed mean age of main saplings in young stands should equal the mean age according to the input data.

Initial Age Source

UseFunction: The built-in function will be used to assign initial ages.

FromDatabase If the database contains tree ages, these will be used as intial tree ages.

Regeneration

Allows you to control how the forest regeneration, the establishment of new trees, should be handled in the simulations.

Ingrowth Model

Deterministic applies deterministic ingrowth model components, where ingrowth is defined as the establishment of other seedlings than those planted.

Stochastic applies stochasitc ingrowth model components, where ingrowth is defined as the establishment of other seedlings than those planted.

None applies no ingrowth/establishment of other seedlings than those planted.

Min Mean Age Invoke Ingrowth

Minimum mean age before invoking ingrowth function. When a young stand enters the established phase, part of the tree population may be truncated. Originally, the idea in Heureka was that trees smaller thatn 4 cm, should not be transferred to the established phase but instead represented by the new trees generated by the ingrowth functions. This has been modified, so that with diameter ≥ 2 cm are transferred. Running the ingrowth function immediately after the established phase is started, would overstimate the number of samll trees. It has been found resonable that at a stand age of 50 years, no trees that come from the young phase are less than 4 cm, allowing us to activate the ingrowth function at that age.

This means that the value of this parameter should depend on the minium diameter you set. If set to 4 cm, set this parameter to 0.

Random Seed

Random seed in sapling damage function. Must be at least 1, otherwise ignored. In deterministic application, ensures that the same result is obtained even if run on different computers. If deterministic application and seed 0 or less, result could vary between computers. In stochastic application, seed is used if at least 0, otherwise "truly" random.

Ingrowth Species

Allows you to deactivate the ingroth function for selected species.

Max Age Ingrown Trees

Age limit for ingrown trees (brh). The minimum of this and the age calculated with the tree age function will be used (in the first period the ingrown trees occurs).

Sapling Diameter Model

Model for assigning sapling diameter (based on height-diameter relation)

Elfving implies that the model by Elfving will be used in calculation of the saplings' diameter.

NystromSoderberg implies that the model by Nyström and Söderberg will be used in calculation of the saplings' diameter.

Skip Ingrowth Step One

True implies that the first step in the ingrowth model (Wikberg P-E), is skipped in the first 5-yr period and replaced with the actual number of small trees. This requires that you use for example NFI data as input data. False if this step should be included (default).

Sapling Damage Factor

Weight factor for the mortality rate and occurrence of damages on young trees. The larger the weight, the larger the mortality and number of damaged trees. With 0 weight, no mortality and damages occur. Default value = 1.