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ANNUAL OF SOFIA UNIVERSITY „ST. KLIMENT OHRIDSKF

FACULTY OF BIOLOGY

Book 2 - Botany

Volume 97, 2005

ANNUAIRE DE L’UNIVERSITE DE SOFIA „KLIMENT OHRIDSKI"

FACULTE DE BIOLOGIE

Livre 2 - Botanique

Tome 97, 2005

POLLEN DIAGRAM FROM LAKE MALKO SMRADLIVO,

CENTRAL RILA MOUNTAINS

SPASSIMIR TONKOV

Department of Botany, Faculty of Biology, 8 Dragan Tsankov Blvd, Sofia 1164

E-mail:

tonkov@biofac.uni-sofia.bg

Abstract. Pollen analysis was conducted on a core 140 cm in length obtained from the

southern peaty shore of Lake Malko Smradlivo (2300 m a. s. 1.) in the Central Rila Mountains

(SW Bulgaria). The pollen stratigraphy indicated Subatlantic age of the sediments. The vegetation

reconstruction revealed distribution of groups of

Pinus mugo

among herb vegetation in the

subalpine belt and wide spread of coniferous forests composed of

Pinus рейсе

,

Pinus sylvestris

and

Picea abies

in the approaches to the lake. Two surface moss pollen samples collected from the

upper part of the coniferous belt were also analyzed. The find of pollen of

Ephedra fragilis-

type

in one of these samples suggests a present-day distribution of

Ephedra

species in the study area.

Key words',

pollen analysis, Subatlantic, surface samples, Lake Malko Smradlivo, Central Rila

Mountains

Mountain lakes are suitable sites for palaeoecological studies in attempt to

reconstruct past environmental changes as their sediments usually contain

sufficient quantity of well-preserved fossils such as pollen, plant macroremains,

diatoms, etc. (Reasoner et al., 2001).

During the last years a research programme was initiated focused on

palaeoecological investigation of lakes in the Rila Mountains (2925 m) aiming

at obtaining new detailed information on the vegetation development, climate

changes and human impact at mid- and high altitudes in postglacial time.

Pollen and plant macrofossil diagrams supplemented with radicarbon dates

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