The paper presents the results of field studies carried out in I O chosen forest islands in a suburban area of the town of Jaworzno in the years 1995-2002. Different objects have been studied, among others: natural remnants of oak-hornbeam forest and planted pine-larch woodlots cultivated on the habitat of xerothermic grasslands. In comparison with the total nora of the town, the participation of non-synantropie species and synecological groups associated with natural habitats is much bigger. There are 24 protected species to be found, 40% of protected nora of the town. Despite their diversity, they are precious refugees of many woodland and grassland as well as meadow species occurring within the areas and in their vicinity.

Fallow wasteland, seemingly worthless for agriculture, may in fact be of great natural value. We need to be very cautious when using it for cultivating energy plants.

Phytosociological studies carried out in the forests of Silesian Upland and Głubczyce Plateau during the years 1994-2000 showed a widespread distribution of Impatiens parv!flora. It ranges from coniferous and mixed forests to alder carrs, riverside carrs, oak-hornbeam phytocoenoses, and beechwood associations. The optimal conditions for Impatiens parviflora are those found in Ti/io-Carpinetum typicum. Nevertheless, the highest percentage cover of that species occurred in heavily degenerated communities which were the result of clear-felling and tree planting.

Pozornie bezwartościowe dla rolnictwa nieużytki rolne są niezwykle cenne przyrodniczo. Przeznaczaniu ich pod uprawę roślin energetycznych musi towarzyszyć wielka ostrożność.