The article is about naturalization features of invasive fraction of flora in Voronezh and some other regions of the European part of Russia. The summary table represents ЭКОЛОГИЯ И ПРИРОДОПОЛЬЗОВАНИЕ ISSN 2306-4153. Вестн. Волгогр. гос. ун-та. Сер. 11, Естеств. науки. 2015. № 3 (13) all invasive and potentially invasive plants of the European part of Russia with their level of naturalization (or invasive status). Invasive fraction of flora in the Voronezh region numbers 120 plants. All of them are on different stages of naturalization process in an anthropogenic areal. Invasive plants represent by agriophyts-41 (34,1 %) species, epecophyts-75 (62,5 %) species and colonophyts-epecophyts-4 (3,4 %) species. Totally there are 201 species of invasive and potentially invasive plants spread within European part of Russia (Northern-West Russia, Ivanovo, Kaluga, Tver, and Voronezh regions). They formed the "black list" of European Russia. 10 species are common to all invasive fractions. These are Acer negundo, Amelanchier x spicata, Aster x salignus, Echinocystis lobata, Elodea canadensis, Heracleum sosnowskyi, Impatiens glandulifera, Impatiens parviflora, Juncus tenuis и Lupinus polyphyllus. The analysis of the general list of invasive fractions of European Russia shows that 120 species of the list are invasive or potentially invasive in the Voronezh region (100 and 20 species in accordance), adventives naturalized species-31, native species-19, archaeophyts-2, apophyts-4. 26 species from the list were not found in the Voronezh region. Apparently, the region is a transit area for many invasive plants, which migrate from South to North, from East to West etc. Not only its natural and climatic potential, but also high level of transformation of local landscapes enabled immigrant-plants to naturalize within the bounds of the region. Furthermore, for many years the Voronezh region was the center of introduction of alien plants. Many of those became a part of invasion fraction of regional flora. In recent decades green building took place of public policy of introduction. A lot of landscaping firms work with not native species. They offer them in a great variety for citizens. In case of introduction, some of these species could become invasive.

The article deals with the analysis of alien species in local floras of the Voronezh region Nature Reserve Fund. The Voronezh Region is located on the border of the forest-steppe and steppe zones. 16 Model Protected Areas (PAs), having a different conservation status and a various size, have been chosen for the analysis. The article attempts to assess: a) the degree of biological contamination of PAs that protect forest-steppe and steppe ecosystems; b) features of the alien fractions of the PAs' flora of various categories. The characteristics of PAs with respect to the possibilities and conditions for the invasion of alien species of vascular plants are given. The alien fraction of the PAs' flora comprises 262 taxa: 255 species, 5 hybrids, 1 subspecies and 1 variety, referring to 178 genera and 66 families. For the typological analysis, alien species were divided into groups in accordance with the time of the invasion, the way of invasion and the naturalisation level. The average proportion of invasive species in PAs floras is 11.1% (in different local floras it varies from 4.4% to 16.8%). When considering stable flora elements only (excluding ephemerophytes and colonophytes), then the PAs' local flora contamination ratio will make the average of 6.1% (from 3.5% to 8.9%). The largest number of alien species is noted in the floras of state reserves and state nature sanctuaries, regional PAs are characterised by a smaller proportion of alien plants. The analysis of the ways of alien species' invasion has shown that human activity on introduction of plants makes an important contribution to the replenishment of the alien flora in protected areas: 31.7% of alien species had left the cultivation area, 15% were deliberately planted in the PAs. Transformer plants are of the greatest coenotic significance, out of 19 such alien species 11 are xenophytes, the other 8 species are ergasiophytes. The conclusion is made about the necessity to move from the monitoring of alien species to practical work on managing the process of alien plant invasion in state reserves.Key words: alien flora, alien plant species, invasions, Nature Reserve Fund, Protected Area Introduction There has been much speculation and debate on the problem of biological pollution of floras with alien plant species (= adventive species) over the last hundred years. In recent decades, a lot of efforts have been made to create databases of alien plants and compile lists of alien species of different local and regional floras, floras of particular countries and even continents. Nowadays, the world community considers the issue of biological pollution globally acute and believes that various alien plant invasions do pose a threat to biodiversity, indigenous ecosystems, resistance of biological resources and human health (McNeely et al., 2001;Vinogradova et al., 2010). This problem is especially urgent in Protected Areas (PAs), of which the main purpose is the conservation of biological diversity. In this regard, the number of publications devoted to various as...

The report presents some results of the international project «Alien invasive plants of Chengdu city: protection. control, utilization, development of an utilization model», which is jointly implemented by scientists from Voro-nezh State University (Russia) and the Sichuan Provincial Academy of Natural Resources Sciences and the Insti-tute of Botany of the Sichuan Province (China). For the first time, a list of 130 species of invasive plants in Chengdu is published, their typical habitats are indicated.