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The characteristics of communities developing in cereal crops of the Mazowiecki Landscape Park are presented in the paper. The traditional methods of cultivation, a mosaic of fields, meadows and forests as well as a specific microclimate affect the occurrence of species-rich, syntaxonomically differentiated agrophytocenoses. The occurrence of 4 associations and 2 communities in the area of the Park was noted. On the poorest soils, the association Arnoserido-Scleranthetum was the most widespread and internally differentiated, whereas in more fertile habitats the association Vicietum tetraspermae was the commonest. The above mentioned associations were noted more frequently in winter crops than in spring cereals. Plots of the association Papaveretum argemones and intermediate communities, between Arnoserido- Scleranthetum and Papaveretum argemones, were seldom observed in the studied area. Plots with domination of species diagnostic for the order Polygono-Chenopodietalia occurred rarely in spring cereals, mainly in the protection zone of the Landscape Park. Single, impoverished plots of Aphano-Matricarietum were recorded in the south-eastern part of the Park.
The paper presents the results of the research on plant communities in arable fields in Wroc³aw city (a capital of Lower Silesia, in the south-west of Poland). The investigations were carried on applying the commonly accepted Braun- Blanquet method. Two plant associations have been identified in cereal fields of the investigated area: Vicietum tetraspermae and Aphano-Matricarietum. The first of the mentioned associations developed worse than the second one which is its geographical substitute. Two other associations have been identified in fields containing root crops: Galinsogo-Setarietum and Echinochloo-Setarietum. All of these associations occur in surrounding areas of the city in specific habitats which indicate particular soil reaction, moisture content and nitrogen reserves.
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