Allometric relationships between trunk slenderness and crown dimensions in Scots pine

Arkadiusz Tomczak, Magdalena Redzimska, Tomasz Jelonek, Bartosz Bułaj


The study compared the dimensions and indicators of the crown of trees that differ in slenderness. Two series of model trees were analysed, with respectively smaller and greater breast-height diameter. It was assumed that irrespective of the thickness of the
trunk, as the height and slenderness varied, the crown architecture would vary proportionally. Changes in the crown architecture can be expected to compensate for the risk of loss of stability as the value of the slenderness ratio increases. The study was carried out in eight selected stands in north-west Poland, in which pine was the dominant species. Trees with higher slenderness were found to have crowns that were longer in both relative and absolute terms, and were themselves more slender. It was also found that in the thinner trees (d1,3=28 cm) the values of all of the analysed crown features increased as the slenderness ratio increased. For the thicker trees (d1,3=34 cm) the crown diameter decreased relative to the h:d ratio. The differences in crown slenderness between the extreme values of the analysed range were much greater than in the case of the thinner trees. It was therefore concluded that, in general, changes in crown architecture may compensate for the risk of loss of stability as the value of the slenderness ratio increases.


tree stability, biomechanics, biomass allocation

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Forestry Letters  eISSN 2450-4920

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