Result Variables

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[[::Result Variables|English]]

Figure 1. Variable selection dialog. The contents may vary depending on application and context.

Introduction

Variables that can be projected by the Heureka system are listed here. Notes:

• Most variables has a before and after-component, which refers to state or value before treatment, and immediately after treatment.
• When you select variables, for example when running the Treatment Program Generator in PlanWise, or when defined the table view in StandWise, you can hover with the cursor over a variable, in the tree view control, to get a short tooltip description.

Alternative summary

Included

Dummy indicator

IsSetAside

Indicates if the treatment unit is set aside for nature conservation, as part of a parent treatment unit.

Net present value

Net present value for the alternative.

Discount rate

Discount used when net present value was computed.

SoilExpectationValue

Net present value when starting from bare land. Heureka computes three forest generation and assumes the third one to be repeated in perpetuity. Included in net present value. There is currenly an error in Heureka: When seed trees are left after clear cutting and harvested, say 10 years later, the revenue is wrongly considered a revenue in the subsequent generation. This means that the soil expection value is overestimated when seed trees and shelterwoods are retained.

TerminalValue

Value at the end of planning horizon. Computed as the net present value, minus the sum of all disocunted net revenues (revenues - costs), minus discounted soil expectation value, then prolonged to the last period. As a user, you do not need to worry about this variable!

TerminalValueYear

Year to which TerminalValue refers. As a user, you do not need to worry about this variable!

Forest data

The Forest Data result category contains result that describe common forest state variables.

Volume

Volume per ha

Stems

Stems per ha

Basal Area

Sum of cross-sectional basal area of trees at breast-height (m2/ha)

Dg

Diameter of mean basal area tree (cm)

Dgv

Basal area weighted mean diameter (cm)

Mean age

Basal area weighted mean age (yrs)

Hgv

Basal area weighted mean height (cm)

Species data

Same as forest data, but for each species group. The species group codes in Heureka are currently fixed, see defintion of codes here.

Note: It is a bit inconsistent that these data are not included in Forest data. Other result types, such as "Treatments", store both species-wise data and totals in the same node. Each results type actually represent a table in the result database.

Treatment data

Dg Harvest

Dg (diameter of mean basal area tree) of harvested trees.

Dgv Harvest

Dgv of harvested trees.

Regeneration Species

Main species planted or sowed.

Regeneration Method

Planting, Sowing, Seed Trees, or Extensive,

Stems Harvested

Stems harvested (per ha), per species.

Thinning Form

Thinning form (Dg Harvest/Dg After)

Thinning Grade

Percent of basal area harvested.

Treated Area

Proportion of stand productive area at which treatmemt was applied.

Treatment

treatment applied

Mean Tree Volume Harvested

Mean volume (m3sk/tree) of harvested trees.

Volume Harvested..

Volume harvested (m3/ha and species).

Year

Treatment year, starting from year 0.

Year Offset

2.5 if period midths are used, 0 otherwise.

Harvesting data

Not in use, but will replace part of financial data and treatment data.

Growth

Current and mean annual increment (m³sk/ha,yr). Gross and net values per tree species. Growth refers to growth from previous time (period) to current.

Mortality

Mortality per tree species (m³sk/ha).

Diameter distribution of cuttings

Stems harvested (trees/ha) per diameter classes (?).

Financial value

Currently consists of revenues, costs, and yields. Some of these will be moved to Treatments.

Biomass

Biomass (ton dry matter/ha) for different parts of the trees, e.g. stem, branches and roots. Summarized per tree species.

Carbon and nitrogen

Carbon and nitrogen (ton/ha) for soil organic carbon and nitrogen.

Dead wood

Dead wood (m³/ha) for different types of dead wood in different decay classes. Summarized per tree species.

Forest domain

Forest domain

TreatmentControlCategory

Recreation index

Recreation index

Stand-level recreation index (value between 0 and 1) as a function of stand structure, see Recreation value.

Habitat data

Proportion of stand area that is suitable are for the subject species. These results can be computed with the Heureka Habitat Model (not released though), and imported back to the database through the menu "Export Data to Habitat Model" and "Import Data from Habitat Model", found under the Tools menu. Habitat models avaiable for species:

Perisoreus infaustus

Siberian Jay (lavskrika)

Alectoria sarmentosa

Witch's hair (garnlav)

Dendrocopus minor

Lesser Spotted Woodpecker (mindre hackspett)

Bonasa bonasia

Hazel Grouse (järpe)

Harminius undulatus

(violettbandad knäppare)

Scirius vulgaris

Red squirrel (ekorre)

Statistics

Mean, standard deviation and standard errors for age, volume, and stem density, over sample plots within a stand. Applicable to first period, when data has been collected from field sample plot inventory.

Structural diversity

Even-aged class

Tree-size diversity class (Hugin definition).

Tree-size diversity class (Gini coefficient).