EN
Stands of the Święty Krzyż nature reserve are described on the basis of studies carried out in 1992 and 2002 as well as historical data concerning species composition in 1925. During the period of 10 years the stand in the study area Święty Krzyż 1 maintained characters of the growing up stage and phase of storied structure. Its volume increased from 502 to 542 m3/ha, and volume increment was 10.6 m3/ha/year. The stand in the study area Święty Krzyż 2 underwent transformation from the break up stage and regeneration phase to the growing up stage and phase of multistorey structure. Its volume increased from 201 to 264 m3/ha, and volume increment was 8.0 m3/ha/year. During the period from 1925 to 2002 the percentage of fir decreased from about 80% to 33% (Święty Krzyż 1) and 45% (Święty Krzyż 2), while this decrease during 1992-2002 amounted to 12.5 and 3.1% respectively. Most likely the process of fir decrease will be continued for next ten or twenty years, but due to a relatively abundant fir underwood, after 20-30 years its percentage in ingrowth will be increasing.