engleski

Forest Vegetation Dynamics in the Spačva Basin in the Last 40 Years

Forests of the Spačva basin represent the largest complex of near-natural pedunculate oak forests in this part of Europe. The last systematic vegetational research in the area was undertaken in the late 1960s. Since these forests are under constant anthropogenic influences. Vegetation dynamics was studied in detail. 60 relevés were made for three associations (Carpino betuli-Quercetum roboris Anić 1959 ex Rauš 1969, Genisto elatae-Quercetum roboris Ht. 1938 and Leucojo-Fraxinetum augustifoliae Glavač 1959). Alder plant communities are present only in fragments and cover less surface then at the end of the 1960s. The floristic composition of plant communities from the end of the 1960s and today were compared using numerical methods (Direct ordination analysis). Analyses were also made of the changes in Ellenberg indicator values, number of species and cover of vegetation layers. Changes in the entire study area showed a tendency towards drier plant communities. Furthermore, the numerical analyses indicated that there was more similarity between the communiti¬es today than at the end of the 1960s. This is probably result of habitat changes and method of forest management. The biggest changes in the floral composition and other characteristics were found in the subas. Genisto elatae-Quercetum roboris caricetosum remotae Ht. 1938. The majority of these changes were the result of anthropogenic impacts.

forest vegetation; floristic composition; Ellenberg indicator values; numerical analysis; anthropogenic influence; Spačva

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