In the Świętokrzyski National Park, fir trees (41 to 300 years of age at breast height) were characterised by a regular radial increment until about 1960, then there was a very strong increment decline between 1960 and 1985, and regeneration after 1986. Beech trees (21 to 200 years of age at breast height), in the same period of analysis (1880–1994) showed no significant decrease in their radial increment. Pine trees (41 to 250 years of age at breast height) between 1884 and 1994, showed a systematic decrease in radial increment. The difference in the radial growth between younger and older generations was noticeable only in the case of beech.

71-79