The ecological indicator values of vascular plants according to Ellenberg et al. and Zarzycki et al. were used for determining the main relationships between the abiotic environment and the species composition of the herb layer of parks. The research conducted in 51 country parks located in the Sandomierska Basin showed that the vegetation cover of the parks significantly depends on the elements of the abiotic environment (light, soil moisture, physicochemical composition of soil). Mowing was found to influence the species composition of the herb layer, eg. the proportion of synanthropic plants in the vegetation cover was higher in tended parks (with mown herb layer) because of the greater changes to the habitat.

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