Observations on north-west european limostone grassland communities IV. Phytosociological notes on chalk grasslands in Denmark

This paper deals with phytosociological studies of Danish chalk grasslands. These grasslands should be reckoned to a new association, viz. Solidagini-Helictotrichetum pratensis, alliance Mesobromion, class Festuco-Brometea. Two geographically vicarious subassociations could be distinguished. Furthermore attention has been payed to the cryptogams occuring in these grasslands, the influence of dominance of an introduced plant species on the species diversity, and the changes during the last decades in species composition as well as in area of the chalk grasslands in Denmark.