Zbiorowiska ruderalne występujące na terenie byłej Akademii Rolniczej w Szczecinie przy ulicach J. Słowackiegoi Papieża Pawła VI
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Ruderal communities were described on the basis of 71 phytosociologic records. In the studied area four kinds of communities were distinguished as complexes of: Artemisio- Tanacetetum vulgaris, Dauco-Picridetum hieracioidis, Echio-Melilotetum and Onopordetum acanthii. Most vegetation patches were classified into the first two complexes. These communities are richest floristically and the number of taxa within their range varies from 107 to 112. The nature of Artemisio-Tanacetetum vulgaris complex is determined by two characteristic species – Tanacetum vulgare (S=V, D=1445) and Artemisia vulgaris (S=V, D=517). Phytocenoses of this complex are mainly found in fallow areas which are an integral part of built-up areas. They settle down mainly in sands underlaid with loam and clays rich in calcium carbonate. They also occur in a built-up area, but species of meadow communities have a considerable contribution to their structure. They appeared in these communities because their reproductive organs were brought with organic soil for the reclamation of destroyed surfaces. This is confirmed by a numerous and frequent and sometimes facial presence of Potentilla reptans (S=V, D=1895). Patches of Dauco-Picridetum hieracioidis complex occur in the fallow area and on individual sites within the built-up areas. A prevailing species is Picris hieracioides (S=V, D=2657). In the fallow area, very warm and exposed to the sun, often defined as an island of heat, thermophilous and xerophilous species characteristic of Echio- Melilotetum complex with a dominating taxon Melilotus alba (S=V, D=2475) are frequently found. Some patches of this complex were classified into a variant of Calamagrostis epigejos. Also under similar ecological conditions, Onopordetum acanthii. complex occurs. In its patches the presence of two characteristic species of Anchusa officinalis (D=775) and Reseda lutea (D=404) is very often (S=V) observed. The patches of Onopordetum acanthii complex are floristically richest and the average number of species in the record is 38 taxa. In these phytocenoses, characteristic species of Onopordetalia acanthii order occur numerously.
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