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Research into the floristic and ecological characteristics of grasslands in the Zagreb area was conducted in June and July 2020. Eight localities were processed, each containing two 1 m2 plots. The floristic composition of each quadrat was analysed and the presence of two vegetation communities, Festuco-Brometea and Molinio-Arrhenatheretea, was determined. Although indigenous taxa dominate, two invasive plants: Echinocystis lobata (Michx.) Torr. et A. Gray and Erigeron annuus (L.) Desf. have been recorded. Based on the functional traits of taxa, the functional diversity of plots was calculated and compared with the number of taxa and the weight of plant biomass collected within the plots. Functional diversity values ranged from 1.121 to 2.060 and dry biomass from 251.4 to 586.8 g m-2 per quadrat. Correlation analyses linked a decrease in the number of taxa and functional diversity with an increase in biomass and specific leaf area. Functional diversity is positively correlated with the number of taxa, plant dry matter content and leaf dry matter content. It is necessary to conduct this type of research in other grassland communities in Croatia to obtain more detailed insights into the relations of these parameters.
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