VOLUM OMAGIAL - Facultatea de Ştiinţe ale Naturii şi Ştiinţe Agricole

A characteristic of model habitatas in South Dobrudja /Ovidius University Annals, Biology-Ecology Series 14: 33-44 (2010)
Sibth. et Sm. and Salvia ringens Sibth. et Sm. One
species is Balkan subendemite – Dianthus pallens
Sm. One species has adventive origin and one species
has Alpine-Mediterranean.
Four species with protection statute are
established: Adonis vernalis L. is included in CITES
and in the Order for special arrangements for the
conservation and use of medicinal plants in the
category “Collecting herbs is prohibited from the
natural habitats”. Jurinea ledebourii Bunge is
included in the IUCN Red List for Bulgaria in the
category “Endangered”, in the Red book for Bulgaria
in the category „Rare” and in the Biological Diversity
Act in the category „Protected”. Two species are
included in the Biological Diversity Act in the
category „Under the protection and regulated use of
nature”: Bupleurum affine Sadl. and Stipa capillata
L.
The anthropophytes are 53 species (63.86%).
They are an indicator of the extent of human impact
on habitat.
The anthropogenic influence on the habitat due
to the presence of: 1. Improved access to the habitat
by a system roads. 2. Arable land in the vicinity. 3.
The forest shelter belts in the vicinity.
HABITAT 3
A habitat by Bondev [4]: Mesoxerothermal
grass vegetation with a prevalence of Poa bulbosa L.,
Lolium perenne L., Cynodon dactylon L., partly also
Dichantium ischaemum (L.) Roberty and rarely
Chrysopogon gryllus (L.) Tryn.
It is located between Izvorovo and Krasen
villages, municipality General Toshevo. The average
altitude is 180 m. The exposure is southwest. The
slope is variable and reaches 30°. The area of the
habitat is 2 000 dka. The soil type is Leptosols, and
the soil subtype is rendzic Leptosols. The bedrock is
limestone. The cover of the shrub vegetation is less
than 5% and the cover of the herbaceous vegetation is
80%. More than 15% of the ground is devoid of
vegetation cover.
In the habitat have been indetified 103 species of
vascular plants from 84 genera and 32 families. The
families with greatest number of genera are as
follows: Asteraceae – 15 (14.56%), Poaceae – 12
(14.29%), Lamiaceae – 10 (11.90%) and
36
Brassicaceae – 5 (5.95%). The families with greatest
number of species are as follows: Poaceae – 14
(13.59%), Lamiaceae – 13 (12.62%), Asteraceae – 12
(11.65%), Brassicaceae – 5 (4.85%), Euphorbiaceae
– 5 (4.85%) and Rubiaceae – 5 (4.85%). The genus
Euphorbia is with greatest number of species – with 5
species (4.85%).
With the highest percentage of coverage are Poa
pratensis L. (2b) and Elymus repens (L.) Gould. (2а).
With the lowest percentage of coverage (1) is
Carduus thoermeri Weinm. Each of the remaining
100 species has coverage 2m.
The distribution of species in biological type is
as follows: The perennial herbaceous plants (p) are
most – they are 53 species (51.46%). Secondly, are
annual herbaceous plants (a) with 32 species
(31.07%). The biennial herbaceous plants (b) are 10
species (9.71%). The transition group of annual to
biennial herbaceous plants (a-b) has 3 species
(2.91%). The transition group of annual to perennial
herbaceous plants (a-р) has 2 species (1.94%). The
trees (t) are 2 species (1.94%) and the shrubs (sh) –
one species (3.61%) only.
The largest number of species (31) has
circumboreal origin. Secondly, are European (27
species) and Mediterranean type of elements (20
species). The species with Pontic origin are 13. The
cosmopolitans are 6 species. Three species are
Balkan subendemites – Ornithogalum sibthorpii
Greut., Verbascum banaticum Schrad. and Carduus
thoermeri Weinm. The adventive species are 2. One
species has Alpine-Carpathian origin.
Three species with protection statute are
established: Artemisia pedemontana Balb. is included
in IUCN Red List for Bulgaria in the category
„Endangered”, in the Red book for Bulgaria in the
category „Threatened with extinction” and in the
Biological Diversity Act in the category „Protected”.
Helichrysum arenarium (L.) Mornh. and Stipa
capillata L. are included in the Biological Diversity
Act in the category “Under the protection and
regulated use of nature”. Helichrysum arenarium (L.)
Mornh. is included in the Order for special
arrangements for the conservation and use of
medicinal plants in the category “Collecting herbs is
prohibited from the natural habitats”.