Abstract
An allometric relationship between foliage biomass and crown surface area is investigated in a data set consisting of 54 fertilized and 99 unfertilized Scots pine (Pinus sylvestris L.) trees from 16 stands in Central Sweden. The allometric ratios for the unfertilized trees are shown to be weakly correlated with competition defined as tree height relative to dominant height (r = 0.475), and with crown coverage (r = ‐0.563). A slight level difference in the ratios can be detected between stands of different site moisture index. The overall relationship is nonlinear but becomes linear if the coefficient of proportionality is made dependent on stand average crown coverage. This also improves the percentage of explanation, which suggests that the allometry of the crown is related to the light conditions of the tree. Under fertilization, the relationship between foliage biomass and crown surface area seems less stable, at least if measured shortly after fertilization.
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