ISSN 1067-4136, Russian Journal of Ecology, 2006, Vol. 37, No. 3, pp. 152–155. © Pleiades Publishing, Inc., 2006.
Original Russian Text © E.A. Borisova, 2006, published in Ekologiya, 2006, No. 3, pp. 168–172.
Studies on the consequences of anthropogenic
impact on natural ecosystems continue to hold a prom-
inent place in ecological and botanical research. Since
the second half of the 20th century, invasions of alien
plant species have became a global problem. They
endanger the development of natural ecosystems and
may have serious evolutionary consequences (Kornas,
1990; Cronk and Fuller, 1995; Lonsdale, 1999; Rich-
ardson et al., 2000). Some adventive species can invade
natural communities, successfully compete with
aboriginal species, and signiﬁcantly transform the com-
munity structure. A logical consequence of such a situ-
ation is that invasive species have became the objects of
national and international programs (Gel’tman, 2003;
Ivanovo, a city in central Russia, is a large industrial
and transport center with a high degree of urbanization.
Its ﬂora contains more than 380 adventive species, and
152 of them have successfully naturalized (Borisova,
2003). Spontaneous input of diaspores, introduction,
and the existence of anthropogenic ecotopes promote
the distribution of new adventive species and their
establishment in the ﬂora.
The city is surrounded with the continuous belt of
suburban forests. Forest sites also remain within the
city limits, in three parks. Virtually all suburban forests,
especially those adjoining the city and in riverside rec-
reational areas, are strongly disturbed and degraded.
This allows adventive plant species to invade these
METHODS AND OBJECTS
Selected areas of suburban forests were studied in
the Uvod’, Ivanovo, and Talka forestries from 1999 to
2004. They included forests in the water-protection
zone along the banks of the Uvod’ Reservoir (near the
village of Shurintsevo); protective forests along rail-
roads and highways; forests adjoining the ﬁelds of the
experimental agricultural station (near the village of
Bogorodskoe), the state farm for cultivating ornamental
plants (near the village of Bun’kovo) and private garden
plots; and forest sites in recreational areas.
Using conventional methods (
, 1964; Mirkin et al., 2001), test plots (
were established, in which parameters of tree stand,
crown density, and the composition of young growth,
understory, and dwarf shrub–herbaceous layer were
described. Particular attention was devoted to adventive
plant species and, namely, the state of plants, abun-
dance, and speciﬁc features of vegetative and genera-
tive organs. The plots were repeatedly visited during
the growing period to reveal the complete species com-
position of the ﬂora.
According to the detailed forest-site zoning (Kur-
naev, 1982), suburban forests of Ivanovo belong to the
southern subzone of mixed forests.
are the main forest-
forming species. In general, pine forests (including
pine–spruce, pine–birch, and pine–spruce–birch for-
ests) prevail in the study area. Pure pine forests occur in
spots on high banks and slopes of the Talka, Uvod’, and
Kharinka river valleys. Spruce forests are associated
with loamy soils and usually alternate with pine forests.
Herbaceous spruce forests with birch, pine, and, rarely,
aspen are most typical.
Floristic Contamination of Suburban Forests
near the City of Ivanovo
E. A. Borisova
Ivanovo State University, ul. Ermaka 39, Ivanovo, 153025 Russia;
Received July 10, 2005
—In the course of ﬂoristic studies in suburban forests near the city of Ivanovo, 206 species of vascular
plants have been recorded, including 39 invasive species (18.9%). Information on speciﬁc features of distribu-
tion and activity of introduced species growing feral and accidental weeds in different forest types is presented.
The most aggressive species are distinguished. Factors responsible for the invasion of alien species to forest
cenoses and main tendencies in their dynamics are discussed.
: suburban forests, ﬂora, invasive plant species, ﬂoristic contamination.