Synantropní vegetace na území města Ostravy. 1. část

A survey of plant communities of man-made sites at the territory of the industrial city Ostrava. Czech Republic. based on about 680 vegetation relevés is given. Using the deductive method of syntaxonomical classification according to Kopecký & Hejný, about 100 community types are described, and ecological and biological characteristics are given. The plant communities are divided into 6 groups the following of which are discussed in this part of the study: (1) initial communities of therophytes on bare soils of mesotrophic and mesophilic character (i.e. stands with prevailing Chenopodium album. Matricaria maritima, Sinapis arvensis, Chamaeplium officinale. Persicaria sp., Atriplex sagittata etc.); (2) relatively xerothermous pioneer plant communities belonging to the orders Sisymbrietalia and Onopordetalia (i.e. stands ith predominating Sisymbrium loeselii. Lactuca serriola, Conyza canadensis, Melilotus albus. Daucus carota, Pastinaca sativa, Carduus acanthoides etc.); (3) nitrophilous communities of perennial species of the class Galio-Urticetea (i.e. stands with predominating Aegopodium podagraria. Urtica dioica. Calystegia sepium. Chaerophyllum aromaticum, Reynoutria japonica, Impatiens parviflora. Helianthus tuherosus etc.); (4) communities of trampled habitats, belonging to the class Plantaginetea majoris, with prevailing species Lolium perenn1e. Poa annua. Polygonum arenastrum. Potentilla anserina, Potenilla reptans etc. Frequency of occun-ence is also shown for particular species of the Ostrava city agglomeration. Artemisia vulgaris, Achillea millefolium, Cirsium arvense, Lolium perenne and Solidago canadensis are among the most frequent.