ControlTable Treatment Model

From Heureka Wiki
Jump to navigation Jump to search

Overview of TreatmentModel control table parameters.
For a more detailed description of the usage, see the help documention chapters on simulation of treatments, for example:


In the treatment model control table you can configure how individual forest management activities are simulated.

Regeneration - model

Allows you to control how forest regenerations are simulated, regarding planting, natural regeneration using seed trees, and sowing.

Regeneration Model Type

  • Simulation: simulate regeneration from a Weibull distribution.
  • Database: simulate regeneration by imputation of plot data from a database (supplied).

Regeneration - settings

Deterministic Application

(only if Simulation is selected) True applies deterministic regeneration model components, False do not (then stochastic).

Mean Sapling Height When Activated

(only if Simulation is selected)

Defines the arithmetic mean height in meters at stand-level[plot-level?] when trees are initiated, for Natural regeneration, Sowing, Spruce plantation, Pine plantation, and Contorta plantation, respectively. Development before this height is obtained by linear interpolation.

Regeneration Year

Defines the number of years from time of final felling to time of regeneration, applied in simulations of Plantation and Sowing.

Regeneration Settings

Defines the number of seedlings per hectare applied in Plantation (or in Sowing, or in Natural regeneration using seed trees, respectively) following Soil scarification (or Controlled burning, or None, respectively), regarding the tree species and site index. This seedling consumption table will, obviously, lead to certain regeneration costs.

Soil Preparation Year

Defines the number of years from time of final felling to time of soil preparation, applied in simulations of Soil scarification and Controlled burning. Obviously, this number can not exceed settings in Regeneration Year.

Cleaning

Allows you to control how cleanings, a.k.a. pre-commercial thinnings, are simulated.

Cleaning Model

Heureka cleaning defines one model of tree removal, actually cutting of saplings, in the cleaning simulations.
Hugin cleaning defines another model of tree removal, currently corresponding to the above, in the cleaning simulations.

Deterministic Application

True applies deterministic cleaning model components, False do not (then stochastic).

Mean Height Cleaning

Min defines the minimum arithmetic mean height in meters at stand-level when cleaning is simulated.
Max defines the maximum arithmetic mean height in meters at stand-level when cleaning is simulated.

Min Stems Cleaned

Defines the minimum number of stems per hectare to be cut in cleanings. No cleaning will be simulated if stem density is so low that less stems are able to cut, regarding all current tree species.

Settings for Deciduous Trees

Alfa and Beta are coefficients in a function calculating the priority factor of deciduous tree species. Deciduous trees, i.e. all broadleaves, will then be retained in cleanings prior to coniferuous trees.

Settings for Pine

Alfa and Beta are coefficients in function calculating the priority factor of pine trees. Pines, i.e. Pinus ssp., will then be retained in cleanings prior to deciduous and other coniferuous trees.

Settings for Spruce

Alfa and Beta are coefficients in function calculating the priority factor of spruce trees. Spruces, i.e. Picea ssp. and Abies ssp., will then be retained in cleanings prior to deciduous and other coniferuous trees.

Thinning

Allows you to control how thinnings are simulated. See Thinning for a complete description.

ThinningAlgorithm

Hugin defines one model of tree selection in the thinning simulations.
LOEriksson defines another model of tree selection in the thinning simulations.

Thinning - settings

Thinning Guide

Function for determine thinning intensity.
Hugin and Polynomial are defined for basal area.
StemDensity is defined for number of trees. Only Thinning Algorithm = Hugin can handle stem density targets (as well as basal area and volume targets).

Distance Between Striproads

Defines the distance in meters between the centre of adjacent stip roads, used in simulation of the first thinning in a stand.

Harvest Striproads

True simulates the cutting of strip roads if a stand is thinned for the first time, False do not.

Last Thinning Criteria

Time for last thinning in terms of maximum relative age. If relative age is larger, then no more thinning will be simulated. Relative age is an approximation for how close a stand is to culmination of mean annual growth (MAI). It is computed as mean age divided by 1.1*LSÅ, where LSÅ = minimum eligible age for final felling according to Swedish Forestry Act.

Max Height Any Thinning

Max dominant height (m) when last thinning can be applied. Currently only available when Thinning Guide = StemDensity.

Max Height First Thinning

Max dominant height (m) when first thinning can be applied. If dominannt height is larger and stand has never been thinned, then it is considered too late to do first thinning, due to risk of felling damages on remaining trees.

Max Thinning Grade

Defines the maximum thinning grade, in percentage of basal area, stem density or volume (depending on thinning guide), including any cutting of strip roads. If thinning guide suggest a larger thinning grade, it is set to Max Thinning Grade.

Min Thinning Grade

Defines the minimum thinning grade required in order to apply a thinning, in percentage of basal area, stem density or volume (depending on thinning guide), including any cutting of strip roads. Is thinning grade accoring to guide is lesser, thinning is cancelled.

MinDiameterThinning

Defines the minimum diameter, in centimeters, of trees to be cut in thinnings.

Min Prop. Thinnable Plots

Min proportion of plots (impediment plots ignored) that should be thinned according to thinning guide in order for thinning to be applied. Currently only available when Thinning Guide = StemDensity.

RelativeDiameter

(only if LOEriksson is selected)

First defines the relationship between the mean diameters of trees cut and trees retained in first thinning of a stand, expressed in percentage.
Second defines the relationship between the mean diameters of trees cut and trees retained in second and following thinnings of a stand, expressed in percentage.

Striproad Width

Defines the effective width of strip roads in meters. Effective means that the harvesting machines can thread (slingra sig fram). A "threading factor" (slingerfaktor) of 75 % gives an effective strip road width of 3 m with an actual strip road width of 4 m.

Thinning Algorithm Parameters

Applies when Thinning Algorithm = Hugin.

Deciduous/Conifers (x1)
Parameter for adjusting thinning grade of deciduous trees versus conifers.
x1 = 0: Same proportion.
x1 > 0: Thinning grade for deciduous trees is relatively larger than thinning grade for conifers.
x1 < 0: Thinning grade for conifers is larger than for deciduous.
Range: between -1 and 1.
Default: 0
Spruce/Pine (x2)
Parameter for adjusting thinning grade of spruce trees versus pine (including contorta).
x2 = 0: Same proportion.
x2 > 0: Thinning grade for spruce is larger than for pine.
x2 < 0: Thinning grade for pine is larger than for spruce.
Range: between -1 and 1.
Default: 0
From above/below (x3)
Parameter for thinning form.
x3 = 0: Uniform thinning.
x3 > 0: Thinning from above.
x3 < 0: Thinning from below.
Range: between -1 and 1.
Default: -0.2 (i.e. from below)
Second smallest/smallest (x4)
Parameter for distributing thinning grade over two smallest diameter classes, in each thinning species group (spruce, pine, deciduous).
x4 = 0: For each species group, Same proportion in diameter class 1 and 2.
x4 > 0: Higher thinning grade in diameter class 2 than in diameter class 1.
x4 < 0: Higher thinning grade in diameter class 1 than in diameter class 2.
Range: between -1 and 1.
Default: -0.1 (i.e. relatively more of smallest)
Largest/Second largest (x5)
Parameter for distributing thinning grade over two largest diameter classes.
x5 = 0: Uniform thinning.
x5 > 0: Thin more of largest trees.
x5 < 0: Thin more of second largest than of largest trees.
Range: between -1 and 1.
Default: -0.1 (i.e. relatively more of second largest)

Thinning Guide Hugin Settings

Opens dialog with coefficients for thinning guide "Hugin" (of site index and dominant height, respectively) used in calculations of the tree species' basal area, before and after thinning.

Thinning Guide Polynomial Settings

Opens dialog with thinning guide coefficients for thinning guide "Polynomial" (of site index and dominant height, respectively) used in calculations of the tree species' basal area, before and after thinning.

Thinning Guide Stem Dens. Beta

Setting for thinning guide "StemDensity", parameter β = Domainant height at which first thinning should be done.

Thinning Guide Stem Dens. Delta

Setting for thinning guide "StemDensity". This parameter controls slope of function.

Thinning System

These parameters are only used in cost functions and should not be confused with settings for how a thinning should be simulated.
  • NotSpecified: defines that non specified thinning types should be simulated.
  • StripRoad: defines that thinnings with strip roads should be simulated.
  • StripRoadMidFieldMachine: defines that thinnings with harvester should be simulated.
  • StripRoadMidFieldChainsaw: defines that thinnings with harvester and manual labour (with chainsaw) should be simulated.

Tolerance

(only if LOEriksson is selected)

Defines the maximum deviation between target and simulated thinning intensity, expressed in value range (0, 1), to be accepted at the plot-level[?].

UMax

(only if LOEriksson is selected)

Defines the maximum proportion, regarding basal area, of a single tree of all trees cut at the plot-level, expressed in percentage and value range (80, 100).

UMin

(only if LOEriksson is selected)

Defines the minimum proportion, regarding basal area, of a single tree of all trees cut at the plot-level, expressed in percentage and value range (0, 20).

VaryThinningIntensity

True allows for thinning intensity to vary between plots (proportional to basal area), False do not.

Selection felling

(only if Hugin is selected as thinning model) Allows you to control how selection fellings (usually applied in "continuous forestry") are simulated.

SelectionControlParameter

Equivalent to Thinning Algorithm Parameters but other settings for selection fellings.

Final Felling

Allows you to control how final fellings (sometimes referred to as "clear cuttings") are simulated.
See also: Help chapter on final felling

Min Diameter in Final Felling

Defines the minimum diameter, in centimeters, to be cut in the simulations.

Seed Tree Retention

(only if SeedTree or Shelterwood is selected) Same as ThinningControlParameter

Shelterwood Retention

(only if Seed Tree or Shelterwood is selected) Note: Do not confuse with Tree Retention in control table Nature Conservation

  • RetainedBasalAreaLowSI: The basal area, in m2/ha, of seed trees and shelterwood to be retained in stands with site index less than 20 m. *RetainedBasalAreaHighSI: The basal area, in m2/ha, of seed trees and shelterwood to be retained in stands with site index greater than 20 m.
  • RemovalTime: The number of years from final felling to when retained trees are cut.
  • RetainDominantSpecies: If True, retain trees of the dominant tree species, False do not.
  • MinimumRetainedBasalArea: The minimum basal area, in m2/ha at the stand-level, of seed trees and shelterwood to be retained.
  • RetainedSpecies: (only if RetainDominantSpecies is False) The tree species to be retained as seed trees and shelterwood.


Remove Existing Overstorey

Regulates how shelterwood, seed trees or retention trees (trees left for the next rotation) will be handled. With the latest template for stand register, you will also be able to specify suggestions for treatments and control how they are used in each stand. Existing trees retained for nature conservation can also be treated separately in the new version.

Use SI Management

Set Use SI Management to True if you have typed values in the Site Index Management column in the stand register (version 3), and you want to use them to govern the minimum age of final felling. If you use the Forest Management Planning Package (FMPP) and have a stand register linked to it with values for the Site Index Management column, the latter will be given precedence. If SI Management is set to False, or SI Management is missing, SIS is used (Site quality index according to site factors).

Fertilization

Allows you to control how fertilizations are simulated.

FertilizerAmount

Defines the amount of fertilizer in kilogram per hectare used in the simulations.

FertilizerSubstance

AN defines that ammonium nitrate is the active substance in fertilizations.
UREA defines that urea, i.e. ammoniac[?], is the active substance in fertilizations.

MaxAnnualGrowth

Defines the maximum annual growth, in m3sk/ha, if fertilization of the stand is to be simulated.

MeanHeightLimitFertilization

Defines the minimum average height (basal area weighted) in meters if fertilization of the stand is to be simulated.

MinConiferProportion

Defines the minimum proportion of conifers, in percentage of basal area, if fertilization of the stand is to be simulated.

SiteIndex

Min defines the minimum site index value in meters if fertilization of the stand is to be simulated.
Max defines the maximum site index value in meters if fertilization of the stand is to be simulated.

Intensive Fertilization

Allows you to control how intensive fertilization is simulated.

Note that intensive fertilization can only be simulated if the soil moisture is mesic or mesic-moist, in the southern part (latitude <58° N) and the central part (58-61° N) of Sweden also moist soils are possible to intensively fertilize. Moreover, the site index (H100, m) must in the northern part of Sweden (>61° N) be below G26, in the central part below G30, and in the southern part below G34, to allow for intensive fertilization.

HeightIntensiveFertilization

Min defines the minimum average height in meters if fertilization is to be initiated in the young stand.
Max defines the maximum average height in meters if fertilization is to be initiated in the young stand.

MinSpruceProportionIntensiveFertilization

Defines the minimum proportion of spruce, in percentage of basal area (or of stems per hectare), if fertilization is to be initiated in the young stand.

MinStemsIntensiveFertilization

Defines the minimum number of stems per hectare if fertilization is to be initiated in the young stand.

Biofuel

Allows you to control how forest fuel extractions are simulated.

Restrictions

  • MinSpruce: defines the minimum proportion of spruce, in percentage of basal area, if extraction is to be simulated.
  • MaxDiamStump: defines the maximum diameter, in centimeters, of the stump if extraction is to be simulated.
  • MinDiamStump: defines the minimum diameter, in centimeters, of the stump if extraction is to be simulated.

Stump Extraction

Selection of species for which stumps and roots can be extracted. For each species to extract, set value to True.

Utilization

  • Top: defines the proportion, in percentage, of the top (incl. stem, branches, and needles) that is utilized in extraction.
  • BranchesNotTop: defines the proportion, in percentage, of the branches below the top that is utilized in extraction.
  • BranchesTop: defines the proportion, in percentage, of the branches of the top that is utilized in extraction.
  • DeadBranchesNotTop: defines the proportion, in percentage, of the dead branches below the top that is utilized in extraction.
  • DeadBranchesTop: defines the proportion, in percentage, of the dead branches of the top that is utilized in extraction.
  • NeedlesTop: defines the proportion, in percentage, of the needles of the top that is utilized in extraction.
  • NeedlesNotTop: defines the proportion, in percentage, of the needles below the top that is utilized in extraction.
  • Stump: defines the proportion, in percentage, of the stump that is utilized in extraction.

Tree Retention

(Moved to this control table from Nature Conservation control table in version 2.9)
Allows you to control if trees should be retained, as a part of the simulation of the biological considerations to be taken.

Retain Trees

True: Selected trees (according to settings below) should be left after final felling or after selecion felling, and left until the next final felling or selection felling at which a new decision taken what trees to retain.
False: No nature conservation trees should be retained.

Tree Retention Settings

(only if Retain Trees = True) Allows you to control how trees are to be retained.

Retained Trees/ha

Mumber of trees to retain (per hectare).

Retention Priority

Priority settings for which trees to retain as nature conservation trees, regarding species, age and size.

Retention Time

Defines for how long trees are retained (in years). After this time the retained trees will be transferred to downed, coarse woody debris (the "dead wood").

Retention of High Stumps

Leave High Stumps?

If set to True, high stumps will be "created" at final felling. Unlike retention trees, high stumps immediately become part of the dead wood pool of standing dead trees, with a volume reductions for the part of the tree that was harvested.

High Stumps/ha

Mumber of high stumps to create (per hectare).

Height of High Stumps

This is set in the Pricelist Manager (which control the bucking of trees when harvesting).

High Stump Priority

Priority settings for which trees to leave high stumps for, regarding species, age and size.
Retrieved from "https://www.heurekaslu.se/w/index.php?title=ControlTable_Treatment_Model&oldid=9558"