LAUSR

The aim of the research conducted in the years 2013-2018 in the Greater Poland region of Poland was to acquire knowledge about segetal plants representing the Stellarietea mediae class, which appears in the agricultural landscape of environmental islands, and also to determine the reason for its variability both in terms of habitat and connected with the type of agricultural utilization in neighbouring areas. In the areas from 5 to 50 m, 116 phytosociological releves were taken using the classic BraunBlanquet’s method, and these were then subjected to multilateral analysis. Species from Stellarietea mediae definitely dominate in the phytocenoses of inter-field balks (37 taxons), where they reach high stages of constancy. They were encountered less often among inter-field afforestations. In inter-field balks and inter-field waterhole banks species from Centauretalia cyani dominate among grain tillage, whereas ones from Polygono-Chenopodietalia are predominant in cornfields. Where live form structure is concerned, inter-fields balks are dominated by annual plants, whereas on the banks on inter-field waterholes and afforestations, the dominant forms are hemicrytophytes. In balks and afforestations almost 100% of species are synanthropic (mainly aprophytes and archaeophytes) and inter-field waterhole banks are dominated by native flora. The results show that variability in the species structure of marginal habitats in the agricultural landscape depends strictly on the type of tillage and utilization of neighbouring areas, as well as on soil and ecological conditions.