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IDENTIFICATION OF JUVENILE AND MATURE WOOD ZONES IN STEMS OF EUROPEAN LARCH (LARIX DECIDUA MILL.) USING A K-MEANS ALGORITHM

The paper presents assumptions and results recorded thanks to the application of a novel method to identify juvenile and mature wood zones in stems of forest trees based on a k-means algorithm. The algorithm showed the boundary between analysed types of wood on the basis of input data based on macroscopic structure of wood, i.e. the width of the annual ring, the proportion of late wood in the annual ring and the length of the ray of the annual ring (the location of the annual ring on the ray). Analyses conducted using this method indicated that juvenile wood in 24 European larches covers from 9 to 22 annual rings located around the pith (on average 13). The applied method was verified by changing the degree of crystallinity of cellulose determined at breast height of 3 mean sample trees. Boundaries indicated by the algorithm coincided with high accuracy with places where the course of changes in values of the degree of crystallinity at successive annual rings started to be similar.