A contribution to the knowledge of resilience of forest ecosystems at higher altitudes of the Moravian-Silesian Beskids

On the example of a spruce monoculture established by artificial regenerati on in the Bily Kriz locality in the Moravian-Silcsian Beskids (The Czech Re public) at an altitude of 908 m, available parameters were analysed of the clement balance and ecological stability of the ecosystem was evaluated. Re sults of the study show that the forest ecosystems are in a stationary slat e distant from the equilibrium one and their resistance against changes in the abiotic environment (resilience) is low. Critical parameters are as fol lows: unsuitable species and spatial structure of stands, high input of aci ds in precipitation, unbalanced clement budget, nat root system and lack of nitrogen and magnesium in mineral nutrition. In case of the occurrence of unsuitable climatic events there is a high probability of forest stand dama ge in the future.