Variation in basic density of <i>Paulownia tomentosa</i> along axial and radial direction in nurseries in Greece

This study investigates the basic density variation of Paulownia tomentosa wood along both radial and axial directions, using samples from a plantation in northeastern Greece. Two 5-year-old trees were felled, and wood discs were extracted at various heights. Basic density was calculated for small wood cubes, revealing variability within the trees. Results showed that the radial density decreased from the pith to the bark, ranging from 0.350 to 0.220 g·cm −3 . This pattern is attributed to the semi-ring-porous structure of the wood and cambial activity. Axially, density increased from the trunk base to the crown base, with values ranging from 0.248 to 0.428 g·cm −3 . This axial variation aligns with physiological processes and reduced water availability in upper sections of the trunk. The average basic density of 0.334 g·cm −3 categorises P. tomentosa as a lightweight wood, suitable for applications requiring low mechanical strength. The findings highlight the species’ suitability for fast-growing plantations due to its density stability and ease of processing. This research contributes to understanding P. tomentosa's wood properties, supporting its use in biomass and lightweight applications.