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Within the framework of work on the anatomical struct ure and durability features of wood, as well as analyses of radial growth, a pr eliminary analysis was carried out in regard to variation in the heartwood within Black locust trees. The research was carried out in three stands of straight-stemmed t rees in western Poland. The variation displayed by the heartwood around its cir cumference and the eccentricity of the trunks was characterised with rto: the heartwood radial index (HRI), the cross-sectional shape factor for heartwood (CSsf) and the pith eccentricity index (PEcc). The results confirme d a relationship between the degree of variation around the circumference of the heartwood and the mean age of the stands, while at the same time making clear the high level of differentiation in radial variation at the level of the individual tree. The findings suggest that the fertility of the habitat does not exert much of an i nfluence on the generation of heartwood in Black locust trees. No statistically srelationship was obtained when the circumferential variation of the h eartwood was set against the total height or diameter at breast-height. Only in th e case of crown length, and then only at the Wo¯ow site, was there a moderate ne gative correlation with the coefficients of circumferential variation.

Circumferential variation in heartwood in stands of black locust (Robinia pseudoacacia L.)