Plants species composition evaluation in ruderal and segetal habitats of the Aromashevsky district of the Tyumen region

The paper presents the results of studying the species composition of plants in ruderal and segetal habitats. The total number of established species in ruderal and segetal habitats was 67, of which 27 species were found in both types of habitats. Segetal habitats were formed by 35 species from 21 families, and ruderal habitats consisted of 57 species systematized by 23 families. Plants of ruderal habitats are predominantly represented by the families Asteraceae, Lamiaceae, Brassicaceae and Poaceae, their share was 14.29-23.8 % of all families recorded. The Brassicaceae, Fabaceae, Poaceae and Asteraceae families dominated in ruderal habitats, their share was 21.74-65.22 %. All plants according to the degree of confinement to a certain type of habitat are systematized into the corresponding groups (segetal, segetal-ruderal, ruderal-segetal, ruderal). The share of segetal plant species was 14.9 % of the total number of species. High occurrence is typical for Persicaria lapathifolia L., Dracocephalum ruyschiana L., Chenopodium album L., Avena fatua L., Panicum ruderale (Kitag.), Echinochloa crusgalli (L.). The share of segetal-ruderal species was 19.4 %. The ubiquitous distribution is characteristic of Cirsium arvense L., Atriplex sagittata Borkh., Cannabis ruderalis Janisch., Atriplex sagittata Borkh., Fumaria officinalis L., Brassica campestris L., Capsella bursa-pastoris (L.) Medik., Panicum ruderale (Kitag.) Chang. Ruderal-segetal and ruderal species accounted for 23.9 and 43.3 %, respectively. The coefficient of floristic commonality of Jaccard was 0.42. Accordingly, 42 % of weed species grow in both types of habitats. This confirms the existence of a relationship between the plants of ruderal and segetal habitats.