Modelling the inter-tree variation of knot properties for Pinus sylvestris in Sweden

With the help of the Swedish Scots Pine Stem Bank, the variation of internal knot properties was studied between stems and stands in sections in which the vertical variation was small. By means of explanatory site, stand and tree variables, knot property models were developed to describe variation between and within stands. Much of the between stand variation, and the lesser part of the random tree variation, in knot size, knot length and knots per whorl, was accounted for. However, knot angle was difficult to predict. This probably largely depended both on genetic control of this property, and on the measurement error caused by the low longitudinal resolution of the computer tomography scanning technique employed. Individual tree measurements of variables stable over time, such as growth-ring width close to the pith and stem diameter at the height of the lowest dead branch, were highly significant, and were the most important explanatory variables.

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