Diversity and spatial structure of cryophytic steppes of the Minusinskaya intermountain basin in Southern Siberia (Russia)

Diversität und kleinräumliche Verbreitung von Kryophyten-Steppen im Minusinskaya-Gebirgsbecken in Südsibirien (Russland)

  • Cryophytic steppes in the Minusinskaya intermountain basin containing plant species that are predominantly distributed in the alpine zone such as Androsace dasyphylla, Dryas oxyodonta, Festuca sphagnicola, Kobresia myosuroides, K. filifolia, Minuartia verna, Oxytropis bracteata, Sagina saginoides, Papaver nudicaule, Patrinia sibirica, Pedicularis lasiostachys, Pulsatilla ambigua, Saussurea schanginiana, which are considered remnants of the Pleistocene vegetation. Based on 89 relevés, we classified cryophytic steppes using the Braun-Blanquet method within two phytosociological classes: Central Asian steppes of the Cleistogenetea squarrosae and West Palearctic steppes of the Festuco-Brometea. Three associations (Androsaco dasyphyllae-Caricetum pediformis, Pulsatillo patentis-Caricetum pediformis and Bupleuro multinervi-Helictotrichetum desertori) with three subassociations and three variants were described with respect to their phytosociological affinities and ecology. DCA ordination showed floristic differences between syntaxa, while correlations of DCA axes and floristic and environmental variables detected substrate type and temperature regime as presumably main drivers for vegetation differentiation. Another driver for vegetation differentiation seems to be continentality of the climate. Small scale distribution of cryophytic steppes were mapped using satellite images with resolution of 1.8 m. Cryophytic steppes always occupy only small areas in landscapes, on convex parts of undulated microrelief of mountain slopes and summits characterised by drought in summer and deep soil freezing in winter. These special micro-ecological conditions play an essential role for the existence of alpine flora in the Minusinskaya intermountain basin.
  • Die kleinräumig verbreiteten Kryophyten-Steppen (= Steppen mit Pflanzenarten, die auf Frostböden wachsen) des Minusinskaya-Gebirgsbeckens in Südsibirien (Russland) enthalten eine bemerkenswerte Kombination alpiner Pflanzenarten, zu denen Androsace dasyphylla, Dryas oxyodonta, Festuca sphagnicola, Kobresia filifolia, K. myosuroides, Minuartia verna, Oxytropis bracteata, Papaver nudicaule, Patrinia sibirica, Pedicularis lasiostachys, Pulsatilla ambigua, Sagina saginoides und Saussurea schanginiana zählen. Als Eiszeitrelikte haben diese Arten in den im Gebiet großflächig entwickelten moderat-xerothermophilen Steppen mutmaßlich seit dem Pleistozän überdauert (Rever-Datto 1934, 1940, Sobolevskaya 1941, Kuminova et al. 1976). Das Hauptziel dieser Untersuchung ist die Präsentation aktueller Daten zur Diversität, Ökologie und Verbreitung der Kryophyten-Steppen des Minusinskaya-Beckens in Südsibirien.

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Metadaten
Author:Nikolai Ermakov, Alexey Larionov, Mariya Polyakova, Igor Pestunov, Yakiv P. Didukh
URN:urn:nbn:de:hebis:30:3-355887
DOI:https://doi.org/10.14471/2014.34.019
ISSN:0722-494X
Parent Title (Multiple languages):Tuexenia : Mitteilungen der Floristisch-Soziologischen Arbeitsgemeinschaft
Document Type:Article
Language:English
Date of Publication (online):2014/11/24
Year of first Publication:2014
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2014/11/24
Tag:Cleistogenetea; Festuco-Brometea; dry grassland; glacial relicts; plant ecology; syntaxonomy; vegetation mapping
Volume:34
Page Number:16
First Page:431
Last Page:446
HeBIS-PPN:366877437
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 58 Pflanzen (Botanik) / 580 Pflanzen (Botanik)
Sammlungen:Sammlung Biologie / Sondersammelgebiets-Volltexte
Zeitschriften / Jahresberichte:Tuexenia : Mitteilungen der Floristisch-Soziologischen Arbeitsgemeinschaft / Tuexenia : Mitteilungen der Floristisch-Soziologischen Arbeitsgemeinschaft, Band 34 (2014)
Journal:urn:nbn:de:hebis:30:3-355200
Licence (German):License LogoDeutsches Urheberrecht