Ecological assessment of segetal flora activity’s change near Perm

Abstract

Background. The research of segetal species’ activity reveals the processes taking place on agricultural land. The purpose of the study is a comparative, retrospective, environmental analysis of the activity of segetal species in Perm region South-West of Perm. Materials and methods. In 2020, segetal flora of agricultural land near Perm was described. The results of 2020 were compared with the results of 1923 obtained by A.A. Khrebtov. The studies used floristic analysis, environmental indicators. An indicator of activity of segetal species is proposed. Results. In 1923, 173 species of weeds (127 gene-ra, 33 families) were discovered on agricultural lands near Perm. Currently, 193 species have been identified (135 genera, 31 families). Mostly they are Compositae, Leguminosae, Gramineae, Cruciferae, Caryophyllaceae, Labiatae, Polygonaceae. The species saturation of families (6.4) and the generic saturation of families (4.5) increased. In 1923, the species saturation of families was 5.2 units, and the generic saturation was 3.8 units. The species saturation of genera (from 1923 to 2020) has not changed (1.4). In 2020, 13 species of plants were not found. An activity analysis of weed species was carried out according to our indicator. 56 species greatly reduced their activity, in 19 activity increased greatly. Flo-ristic analysis showed a high degree of similarity between 1923 and 2020 (Jacquard index – 79.4 %; Chekanovsky – Sørensen index – 88.5 %). The Shannon – Weaver index was un-changed (4.7). The analysis was carried out using G. Ellenbergʼs environmental indicators. He showed a complete coincidence of environmental characteristics. Conclusions. Over the past hundred years, there have been a number of changes in the diversity of segetal species. The reason is the change in technology and cultivated crops. The use of the activity index made it possible to identify departed species, and species that decreased activity. The vaca-ted ecological niche was occupied by other species. Most of them are apophytes.

Keywords

• segetal flora
• species diversity
• environmental characteristics
• occurrence
• abun-dance