Ecological and floristic spectra of ruderal vegetation syntaxa in the left bank forest steppe of the ukrainian ssr ussr
Ukrayins'kyi Botanichnyi Zhurnal 45(1): 17-19
Floristic spectra of syntaxons (according to families of higher plants, types of area of distribution and type of the root system) as well as ecological ones (according to soil moistening and richness) are presented at the level of associations of the following classes: Artemisietea Lohm., Prsg. et R. Tx. 1950, Agropyretea Oberd, Th. Mull et Gors ap. Oberd. 1967, Chenopodietea (Br.-Bl. 1951) Lohm., J. et R. Tx. 1961, Plantaginetea R. Tx. et Preis. 1950. The ecological moistening spectrum where the distribution of syntaxons forms a distinct series from syntaxons of class Artemisietea to class Plantaginetea is the most informative. Distribution regularities are revealed for the systematic, geographical and biomorphological structures of ruderal vegetation associations. Families Asteraceae, Poaceae, Brassicaceae which moreover have the all-around distribution are represented by the highest number of species. Eurasian and cosmopolitan syntaxons are the basic geographical elements. In the biomorphological spectrum annual and perennial plants prevail as to the plant longevity and mainroot and rhizomatous plants prevail as to the type of the root system.