Ranking stands with treatment indices

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Abstract
Medium-term plans give prescriptions for individual stands in each of three to five years. The long range plan, on the other hand, is based on aggregated data in the form of timber classes, and multi-year periods. Three treatment indices for stands are developed as linkages between these plans. Several model studies are performed where the prioritizing of thinning and fertilization according to index are compared with the solution to a model based on disaggregated data. The index that is based on reduced costs computed on stand data shows the best correspondence. The index that shows the poorest results transfers the treatment assigned to the timber classes to the stand via the kinship of the initial state of the stands with that of the timber classes. It is not evident that the use of this index would perform better than a mere random selection. The third index has reduced costs computed on timber class data which are transferred to the stands via the kinship between them and the timber classes. This index is not as reliable as the first but should be preferred to the second in cases where necessary stand data is lacking.

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