Within the framework of work on the anatomical structure and durability features
of wood, as well as analyses of radial growth, a preliminary 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 trees in western Poland. The
variation displayed by the heartwood around its circumference and the
eccentricity of the trunks was characterised with reference to: the heartwood
radial index (HRI), the cross-sectional shape factor for heartwood (CSsf) and the
pith eccentricity index (PEcc). The results confirmed 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 influence on the generation of
heartwood in Black locust trees. No statistically significant relationship was
obtained when the circumferential variation of the heartwood was set against the
total height or diameter at breast-height. Only in the case of crown length, and
then only at the Wołów site, was there a moderate negative correlation with the
coefficients of circumferential variation.
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