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A new association of ruderal weeds at pančevački rit in serbia / nueva asociación de malezas ruderales en pančevački rit en serbia / nouvelles communautés d’herbes rudérales dans les terrains marécageux de pančevo, serbie

Stanković-Kalezić, R., Radivojević, Lj., Janjić, V., Šantrić, Lj., Malidža, G.
Helia 2014 v.31 no.49 pp. 35-44
Helianthus annuus, annuals, anthropogenic activities, botanical composition, flora, habitats, vegetation, weeds, Serbia
A several-year study of distribution, phytocoenological differentiation, floristic composition and structure of ruderal flora and vegetation and relevant anthropogenic influence was conducted at Pančevački Rit in Serbia. Ten clearly distinctive ruderal communities were identified in the study, including the newly formed community Matricario-Helianthetum annuae. This community is a unique combination of transitional ruderal and agrestal vegetation developing spontaneously in close vicinity of intensively cultivated agricultural fields, in which sunflower (Helianthus annuus L.), an annual crop, appears and persists subspontaneously and often massively, rendering a physiognomical character to ruderal habitats in which ephemeral ruderal weed vegetation often develops, consisting predominantly of annual plants of Sisymbrion officinalis R.Tx., Lohm. et Prsg.1950