In article features of aspects’ change of National park’s Khvalynsky (Saratov region) vegetable communities are revealed by V. V. Alyokhin’s method of sequential descriptions. Five vegetable associations: 1) Stipeta pennatae –Bromopsisosa riparia – Pluriherbosa, 2) Stipeta capillatae – Festucosa valessiaca – Herbosa; 3) Stipeta pennatae – Festucosa valessiaca – Herbosa on sand; 4) Acer platanoides + Tilia cordata – Convallaria majalis; 5) Acer platanoides + Tilia cordata – Aegopodium podagraria are observed. In total 17 types of plants on blossoming rhythms are revealed. They are integrated in 5 cycles: spring, spring-summer, summer, summer-autumn and autumn. Plants of summer and late-spring blossoming types prevail in steppe phytocoenosis, plants of spring blossoming types dominate in forest cenosis. Aspects are formed by 23 species of grassy and shrub layer’ plants which belongs to such phytocoenotypes as forest, margin-forest, meadow-steppe, margin-forest-meadow, steppe. Information about the beginning, duration and end of blossoming of plants is used when arranging security, ecological education and tourism in the National Park.
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