Abstract
The effects of stand density and pruning on the timber quality of Scots pine ( Pinus sylvestris L.) in terms of branchiness were studied, based on models of tree growth and the structural development of the tree crown. The growth model is based on the productivity of the needles and the allocation of produced dry-matter to needles, branches and stem. The crown model is a combination of models for the birth, growth, death and pruning processes, which are controlled by stand density. The simulations showed that timber quality is most improved y pruning in a stand of wide spacing, due to the prolonged effect of pruning on the dynamics of the crown system and the rapid stem growth. In narrowly spaced stands the effect of pruning was to a great extent offset by the effect of stand density. Consequently, the natural dynamics of the crown system in narrowly spaced stands could yield nearly the same quality as results from pruning in widely space stands but in the form of small-dimensioned timber.
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