Abstract
SYNOPSIS Diameter increment over a 13-year period was correlated with crown position and crown form scores for a range of southern Cape forest tree species. It was found that both crown position and form are useful variables for the selection of harvest trees of the canopy species. The growth of subcanopy species was, in general, not related to the crowns' positions in the canopy. Crown form was, however significantly correlated with the growth of some subcanopy species. For all the tree species (mainly canopy species) for which increment was significantly correlated with both crown position and crown form, the crown position and crown form scores were significantly related. This indicates that the exposed crowns had better forms, implying that competition does have a significant influence on the growth of these trees.
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