On the example of a spruce monoculture established by artificial regeneration in the Bílý Kříž locality in the Moravian-Silesian Beskids (The Czech Republic) at an altitude of 908 m, available parameters were analysed of the element balance and ecological stability of the ecosystem was evaluated. Results of the study show that the forest ecosystems are in a stationary state distant from the equilibrium one and their resistance against changes in the abiotic environment (resilience) is low. Critical parameters are as follows: unsuitable species and spatial structure of stands, high input of acids in precipitation, unbalanced element budget, flat 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 damage in the future.