Синтаксономия сегетальной растительности Южного Урала

Abstract

Phytodiversty of weed vegetation in South Ural and its position in floristic classification system are considered. Weed communities were classified to synantropic vegetation class Stellarietea mediae, order Сentaureetalia cyani and 3 alliances revealing main floristic differences and zonal location. Alliance Scleranthion annui united the most mesic weed communities mainly on grey forest soils located in south part of forest zone and in forest-steppe zone of South Ural. Alliance Caucalidion lappulae united thermophilic high species richness communities on rich carbonate chernozem soils of a forest-steppe zone. The union of Lactucion tataricae has united floristically poor weed communities of a steppe zone on the southern chernozem soils. According to results of the ordination and cluster analysis factors of moistening and richness of the soil act as the main drivers of differentiation of floristic structure of the unions.