The authors’ data on the weed species composition in 8 geographic regions of the Russian Federation were laid at the basis of this survey. The segetal flora comprised weeds of cereals, root crops, and perennial grasses. The composition and taxonomic structure of weed species were analyzed. The total number of weedy plants encompassed 686 plant species. The level of regional weed species diversity was positively related to the area planted. Altai Territory, Udmurtia, and Rostov Province had the greatest weed species diversity, with more than 300 species, while Vologda Province had the lowest diversity (193 species). Most species-rich plant families (Asteraceae Dumort., Poaceae Barnhart, Fabaceae Lindl., Brassicaceae Burnet), genera (Potentila L., Artemisia L., Veronica L., Chenopodium L., Silene L., Trifolium L.), their subsequences, contributions of singlespecies families (17–39%) and genera (57–74%) were relatively stable systematic structure indicators. Only 18% of the species were common for all the regions. In each region there were region-specific groups of species. Weed species compositions in geographically close regions – the European part of Russia and the Urals – showed the greatest similarity. As for geographically distant regions (Altai Territory and Rostov Province), their weedy species compositions were distant and contained large groups of region-specific species.
Ash-leaved maple is one of the most aggressive alien species in most Russian regions. It was first brought to the Altai Krai in 1933. For a long time, maple had been used in the urban and village greenery planting and tree belt areas. Nowadays, it is actively settling along riverbanks, roadsides, abandoned lands, etc. Ash-leaved maple is a danger as a transformer species, preventing the pine’s reproduction in the unique natural communities – ribbon pine forests. We studied the state of the Acer negundo L. populations as a transformer species in the Barnaul ribbon pine forest. The maple population status was assessed by the transect method at the selected registration sites. The age of plants was determined by the method of T. A. Rabotnov. The first ordered branches were used for a more detailed characterization of the maple populations. The introduction of maples into the Pinus sylvestris L. communities is associated with a significant anthropogenic impact on the natural communities of the ribbon pine forest. There are pure maple communities formed in some places in the northern part of the ribbon pine forest. Throughout the Barnaul ribbon pine forest, the maple populations are normal and invasive only in the south part. The first-ordered maple branches in the southern part of the ribbon pine forest have signs of apex change associated with adverse ecological factors. The development indicators of maple trees along the entire ribbon pine forest were evaluated for the first time. The results indicate the high adaptability of maple to various ecological factors.
The article contains a comparative analysis of the taxonomical structure of the weedy species composition (segetal flora) in eight regions of Russian Federation: Leningrad, Novgorod, Vologda, Rostov and Sverdlovsk Provinces, Udmurt Republic, Republic of Bashkortostan, and Altai Territory. The segetal flora comprised weeds of cereals, root crops and perennial grasses. The comparison was made separately for the native and alien weeds. The number of native species was higher than that of alien species and varied from 137 to 209 species. The number of alien weeds varied from 99 to 179 species. Vologda Province had the lowest diversity of both native and alien plant species. Udmurt Republic had the greatest native species diversity and Altai Territory had the greatest alien species diversity. The Asteraceae, Poaceae, Brassicaceae, Fabaceae, Lamiaceae, Caryophyllaceae and Scrophulariaceae families dominated in both the native and alien fractions. The authors compared the compositions of species, families and genera of native and alien weeds. Native and alien weedy species showed the greatest similarity in their composition in geographically close regions: European Russia and the Urals. As for geographically remote regions – Altai Territory and Rostov Province – native and alien weedy species compositions were distant. At the same time, the levels of similarity among the native species were lower than among the alien ones. This attests to greater variability in the species composition among native weeds than among alien ones.
В статье проводится характеристика новых для г. Барнаула адвентивных видов растений. Описываются условия их местообитания. Дается их эколого-биологическая характеристика и указываются причины появления новых адвентов. Рассматривается их распространение в естественном ареале и вторичном. Названо несколько адвентивных видов растений, наиболее обильно встречающихся в синантропных местообитаниях.
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