Abstract
This paper is the third and final part of a study attempting to analyse associations and communities in cereal crops of the Łuków Plain. It contains a description of intermediate and impoverished communities established in cereal crops of the Łuków Plain. Patches with phytocenoses without the combination of species characteristic of cereal associations were frequently observed. Impoverished communities of the alliance <em>Aperion spicae-venti </em>established in winter cereal crops. In turn, in spring cereal crops phytocenoses including species characteristic of tuber and root crops were found; they represented either a community with species characteristic of <em>Panico-Setarion </em>or an intermediate community with species characteristic of <em>Aperion spicae-venti </em>and <em>Polygono-Chenopodion</em>. Such communities are established, among others, because of production intensification which changes habitat conditions. Some patches found in the study area were intermediate between the two most frequently observed associations <em>Arnoserido-Scleranthetum </em>and <em>Vicietum tetraspermae</em>.
Highlights
ResultsMany patches of cereal communities in the Łuków Plain area represent phytocenoses which are difficult to unambiguously define in phytosociological terms
Intermediate communities, which establish in the ecotonal area between two adjacent associations, are less frequent. It is these phytocenoses that the present paper is focused on. It is the third part of the work “Associations and communities in cereal crops of the Łuków Plain” so it does not contain the methodology which was presented in the first part of the aforementioned work [1]
Among the impoverished phytocenoses in the study area there were frequently found patches of communities without species characteristic of cereal associations which included a large number of species characteristic of the alliance Aperion spicae-venti
Summary
Many patches of cereal communities in the Łuków Plain area represent phytocenoses which are difficult to unambiguously define in phytosociological terms. In the Łuków Plain area, apart from well established patches of cereal associations, there were found both intermediate and impoverished communities without species characteristic of cereal associations They included: the community intermediate between the associations Arnoserido-Scleranthetum and Vicietum tetraspermae, the community with Scleranthus annuus and phytocenoses with the characteristic species Aperion spicae-venti and Panico-Setarion. Among the impoverished phytocenoses in the study area there were frequently found patches of communities without species characteristic of cereal associations which included a large number of species characteristic of the alliance Aperion spicae-venti. Patches of the community Aperion spicae-venti, including species characteristic of Polygono-Chenopodion, established in spring cereals on different soil types These soils were characterized by a more compact grain-size distribution, usually developed from sandy loams or heavy loamy sands on sandy loam, classified as the very good rye complex, the good wheat complex, or cereal-fodder complexes, of the latter the strong cereal-fodder complex being the most frequent (Tab. 1). Soil unit ps; pgl:pl; pgl.pl; pgl:ps pl; ps.pl; ps; pgl. pl; pgl:pl ps; pgl.pl; pgl:pl; pgl.ps; pgl:gl; pgm.gs; płz; płz:gl; glp psp; pgl.pl.płz; pgl:pl; pgl:ps; pglp:ps; pgm.gl; pgmp; gl; glp pgm.ps; pgm:gl; pgmp; płz:ps; płz; glp; gl pgl.pl; pglp; pgl:gs; pgm:ps; pgm:gl; pgmp:ps; pgmp; glp; gl
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