Point distribution form model for spruce stems (Picea abies [L.] Karst.)

The paper deals with the construction of a point distribution form model for spruce stems. This model is based on the principal components analysis of variance-covariance matrix formed for the Procrustes residuals. The calculation of full Procrustes co-ordinates, the principal components, is demonstrated on an example of a spruce experimental plot at premature age, and a point distribution model is constructed for the first three components. The parameters of the model are evaluated in relation to Konšel’s (Kraft’s) tree classes, normality of their classification is tested, maxima and minima are demonstrated on actual trees. The complete stem shape analysis of all four samples is also provided. A special model is constructed for these samples and the course of the parameters of this model is graphically represented.