Design of Treatment Models

Felling Treatments

Felling treatments, e.g. final felling, thinning, and selection felling are fairly simple once the intensity of the treatment has been determined per tree. All that has to be done is to adjust StemsResidual for each affected tree.

Regeneration including soil preperation

The regeneration models are fairly complex, for more details about the models see Regeneration.

Both the existing regeneration simulators (the ModelRegenerationSimulator and the DatabaseRegenerationSimulator produces a list of saplings that are to be activated in a future period. This is implemented as follows, per prediction unit:

1. The saplings are added to the trees of the prediction unit, with the desired state of the sapling in the current period
2. The activation period is determined
3. The regeneration period is determined (this does not necessarily have to be the current period, depending on the fallow period, i.e. minimum number of years between final felling and regeneration)
4. The expected state for each tree between from the regeneration period to (but not including) the activation period is calculated with interpolation
5. The state of the current period for each tree is moved to the activation period
6. The state of each period from period 0 to but not including the regeneration period is set (all values are 0 and all trees are invalid)
7. Diameter and height growth for each period is set for each tree (as the state of each period is known growth can easily be calculated)