NATURALIZATION OF THE ADVENTIVE FRACTION OF THE MEADOWS FLORA OF THE ROMA-POLTAVA GEOBOTANICAL DISTRICT

Abstract

In the article the adventive fraction of onion flora of Romensko-Poltavsky geobotanical district is analyzed. According to the results of the researches it was established that this fraction includes 55 species belonging to 47 genera, 16 genera, 13 rows, 2 classes, and 1 division. According to the time of introduction, 37 species (67.3%) are dominated by archaeophytes, 40 species (72.7%) by the mode of invasion, 45 species (81.8%) of epicophytes were found by the degree of naturalization, 23.6% of the primary areal species, 12 species (21.8%) by the Mediterranean-Iranian-Turanian and 8 species (14.5%) by the Iranian-Turanian group. Xeromesophytes prevail in relation to humidity with 30 species (54.5%) and heliophytes in relation to light with 40 species (72.7%). In terms of life form, chamelephytes have the advantage – 29 species (52.8%).According to the time of introduction among the epecophytes in the flora of the onion study are dominated by archaeophytes, comprising 30 adventive species (54.5%). By mode of introduction, xenophytes dominate among the epicophytes with 33 species (60%).By primary range, the basis of the epicophytes is formed by adventive species of Mediterranean-Iranian-Turanian (11 species), Mediterranean (10 species) and Iranian-Turanian (6 species) origin, which will constitute 27 species or 60% of all epicophytes. In relation to moisture, xeromesophytes dominate among the epicophytes, which constitute 57.8% of the epicophytes. In relation to light, most of the epicophytes are heliophytes – 33 species (60%). Almost half of the epecophytes consist of therophytes with 25 adventive species (45.5%).