VOLUM OMAGIAL - Facultatea de Ştiinţe ale Naturii şi Ştiinţe Agricole

Dimcho Zahariev / Ovidius University Annals, Biology-Ecology Series 14: 33-44 (2010)
is 80%, the cover of the shrub vegetation is 10% and
the cover of the herbaceous vegetation is 60%.
In the shelter belt have been indetified 49 species
of vascular plants from 44 genera and 21 families.
The families with greatest number of genera are as
follows: Asteraceae and Рoaceae – with 8 species
each of them (18.18%), Rosaceae – 6 (13.64%) and
Lamiaceae – 4 (9.09%). The families with greatest
number of species are as follows: Asteraceae and
Рoaceae – with 8 species each of them (16.33%),
Rosaceae – 6 (12.24%) and Lamiaceae – 4 (8.16%).
The genera with greatest number of species are as
follows: Avenula, Cirsium, Galium, Prunus and
Sambucus – with 2 species each of them (4.08%).
With the highest percentage of coverage (5) are
Quercus cerris L. and Poa pratensis L. (3). With
coverage 2b are Avenula compressa (Heuff.) Sauer et
Chmelit., Avenula pubescens (Huds.) Dumort. and
Lolium perenne L. With coverage 2a are Robinia
pseudoacacia L. and Hordeum hystrix Roth. With the
lowest percentage of coverage (+) are Crataegus
monogyna Jacq., Cirsium arvense (L.) Scop. and
Euphorbia agraria Bieb. Only with one individual (r)
is Celtis australis L. Each of the remaining 38 species
has coverage 2m.
The perennial herbaceous plants (p) are most –
they are 34 species (69.39%). Secondly, are annual
herbaceous plants (a) with 10 species (20.41%).
Thirdly, are the shrubs (sh) with 5 species (10.20%).
The trees (t) are 4 species (8.16%). The transition
group of shrubs to trees (sh-t) has 3 species (6.12%).
The biennial herbaceous plants (b) are 2 species
(4.08%). The transition group of annual to biennial
herbaceous plants (а-b) has 1 species (2.04%) only.
The largest number of species (20) has
circumboreal origin. Secondly, are species with
European (11) and Mediterranean origin (10). The
cosmopolitan are 3 species. Two of the species are
adventive elements. One of the species has Pontic
origin. One of the species is Balkan subendemite –
Galium pseudoaristatum Schur.
One species is Tertiary relict in all of the habitat
– Quercus cerris L. It is wooded artificial for the
creation of the shelter belt.
There are no species of protection status. This
can be explained easily by the artificial origin of the
habitat.
39
The anthropophytes are 38 species (77.55%).
The high number is due to the artificial origin of the
habitat and adjacent to farmland.
The anthropogenic influence due to the presence
of: 1. Improved access to the habitat by a system
roads. 2. Grazing goats and cows. 3. Pollution by
garbage from the shepherds and farm workers. 4.
Arable land in the vicinity.
L.
HABITAT 7
Forest shelter belt formed by Fraxinus excelsior
It is located near Chernookovo village,
municipality General Toshevo. The average altitude
is 160 m. The exposure is east. The shelter belt is
oriented in a southwest – northeast direction. The
slope is low and reaches 5°. The area is 31.5 dka. The
length of the shelter belt is 2 100 m, the width – 15
m, and the height – 15 m. The soil type is
Chernozems, and the soil subtype is haplic
Chernozems. The bedrock is limestone. The cover of
the tree vegetation is 80%, the cover of the shrub
vegetation is 10% and the cover of the herbaceous
vegetation is 60%.
In the shelter belt have been indetified 59 species
of vascular plants from 50 genera and 19 families.
The families with greatest number of genera are as
follows: Asteraceae – 11 (22.00%), Рosaceae – 6
(12.00%) and Rosaceae – 6 (12.00%). The families
with greatest number of species are as follows:
Asteraceae – 14 (23.73%), Рosaceae – 8 (13.56%)
and Rosaceae – 6 (10.17%). The genera with greatest
number of species are as follows: Chenopodium and
Fraxinus – with 3 species each of them (5.08%);
Artemisia, Bromus, Carduus, Centaurea, Consolida
and Hordeum – with 2 species each of them (3.39%).
With the highest percentage of coverage (5) is
Fraxinus excelsior L., followed by Poa pratensis L.
(2а). With the lowest percentage of coverage (+) are
Amorpha fruticosa L. and Elaeagnus angustifolia L.
Only with one individual (r) is Salvia argentea L.
With the cover 1 are 4 species. Each of the remaining
50 species has coverage 2m.
The perennial herbaceous plants (p) are most –
they are 22 species (37.29%). Secondly, are annual
herbaceous plants (a) with 16 species (27.12%).
Thirdly, are the trees (t) with 7 species (11.86%). The