Associations and communities of cereal crops of the Łuków Plain. Part III. Intermediate and impoverished communities

Abstract

The paper is the third and final part of the work attempting to analyze associations and communities in cereal crops of the Łuków Plain. It contains a description of intermediate and impoverished communities establishing 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 Aperion spicae-venti established in winter cereal crops. In turn, in spring cereal crops phytocenoses including species characteristic of the tuber and root crops were found which represented either a community with species characteristic of Panico-Setarion or an intermediate community with species characteristic of Aperion spicae-venti and Polygono-Chenopodion. Such communities establish, 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 Arnoserido-Scleranthetum and Vicietum tetraspermae