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The investigations carried out in 1988 and 1998 on three permanent sample plots in stands of the East Carpathian beech forest (Dentario glandulosae-Fagetum) showed that in the growing up stage, the storeyed structure phase (Jawornik I stand), the stand volume increased from 547 m 3 /ha to 578 m 3 /ha while in the optimum stage, the ageing and regeneration phases (Jawor- nik II), it decreased from 631 m 3 /ha to 600 m 3 /ha, and in the growing up stage, the storeyed structure phase (Tworylczyk), from 611 m 3 /ha to 610 m 3 /ha. In all three stands beech dominated in the upgrowth. During the 10-year period the volume of dead trees (standing and lying ones) increased in Jawornik II and Tworylczyk stands while in Jawornik I stand it decreased. The beech stands of the Bieszczady Mountains have a largely differentiated structure, from one-storey structure in the optimum stage, the ageing phase to many-storeyed structure in the growing up stage. This creates an opportunity for forming the complex stand structure, also the selection forest structure, in managed beech forests of the Carpathians.

Structure and dynamics of stands of primeval character in selected areas of the Bieszczady National Park