Model wzrostu pierśnicy buka (Fagus sylvatica L.) rosnącego w drugim piętrze drzewostanu bukowo-sosnowego

The study was based on the empirical material collected from 78 beech−pine stands located in the territory of the Miłomłyn (46 plots) and Stare Jabłonki (32 plots) Forest Districts. On the basis of the collected material, a breast height diameter growth model has been developed for the beech growing in the understorey of pine−beech stands. The developed function is an integral part of the growth model for mixed beech−pine stands.