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ENVIRONMENTAL CONDITIONS

The Pleven’s Hills are situated in the central parts of the Danube Plain and

to the south gracefully pass to the Balkan Foothill region. Its maximum

altitude is 315 m a. s. 1. and is in the surroundings of Pelishat village. The soils

in the northern and eastern parts of the hills are steppe Chernozems. In the

southern and southwestern parts - Luvisols and Phaeozems formed on the

place of former forest vegetation. The basic rocks are mainly upper cretaceous

chalks. The primary vegetation is highly fragmented, mostly destroyed by

human activity. The ridges and drier parts of the hills host oak forests, which

according to Tzonev (2002) belong to the association

Cotyno-Quercetum cerris

Tzonev 2002. More scarce on the north slopes of the hills and in the wet

valleys of the rivers (Viti, Chernelka ect.) is distributed the association

Staphyleo

- Tilietum tomentosae

Tzonev 2002, and on the rocky places -

Arabio tuttitae-

Carpinetum orientalis

Tzonev 2002. These are communities mainly dominated

by the silver lime and oriental hornbeam. The natural grass vegetation is

represented by the association:

Bothriochloetum ischaemi

(Krist, 1937) Pop

1977. Wet degraded pastures dominated by

Cynodon dactylon

Perss. occur

along the rivers. Large areas in the study region are covered with a forest

plantations of

Pinus nigra

Arn.,

P. sylvestris

L. and

Robinia pseudoacacia

Fig. 1. Localities of macromycetes in the Pleven’s Hills region

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