Vegetation of rock crevices of the montane and colline zones in the Pamir-Alai and Tian Shan Mts in Tajikistan (Middle Asia)

The paper presents the results of phytosociological research conducted on the vegetation of rock habitats in the montane and colline zones of the Pamir-Alai Mountains (Tajikistan). During field surveys done in 2010-2013, 122 phytosociological releves were sampled. Plant species were recorded according to the Braun-Blanquet cover-abundance scale. The vegetation studies were carried out generally in the western Pamir-Alai and south-western Tian Shan Mts, especially in the Zeravshan, Hissar, Hazratishoh, Darvaz, Rushan, Turkestan, Kuramin and Vanch ranges. A synopsis of the rock communities of the montane and colline zones in Tajikistan is proposed. The collected material presents most of the variability among the plant communities of rock crevices and fissures on calcareous as well as acidic substrates in the montane and colline zones in Tajikistan. As a result of field research and numerical analyses, eight associations have been distinguished: Scutellarietum hissaricae, Scutellarietumschugnanicae, Scutellarietum zaprjagaevii, Scutellarietum baldshuanicae, Tylospermetumlignosae, Dionysietum involucratae A. Nowak, M. Nobis, S. Nowak & A. Nobis, 2014, Nanorrhinetum ramosissimi, Campanuletum albertii and the community of Scutellaria adenostegia within new alliance - Caricion koshevnikovii. The main factors determining the species composition of classified associations seem to be the geography of the distribution range, elevation above sea level, rock type and exposition.