Phytogeographical pattern of the Baikal-Dzhugdzhurian alpine flora
Sergey DUDOV
Lomonosov Moscow State University, Moscow, Russia
The Baikal-Dzhugdzhurian province (Sochava 1962), includes the Baikal and Stanovoe
Uplands, Stanovoy Range and ranges of Dzhugdzhur-Stanovoy orogen (Tokinskiy
Stanovik, Dzhugdzhur, Pribrezhniy, etc.) and stretches for more than
1600 km inland from the sea of Okhotsk. According to several floristic studies
the concerned territory is an important migration route for many vascular plant
species and their complexes during Quarternary period climatic changes. Add
to this, a mixture of different florogenetic alpine species complexes takes place,
with continental eastern-Siberian, Beringian and southern-Siberian complexes
among them. The Baikal-Dzhugdzhurian province can be considered as a one
whole phytochorion due to the presence of a number of endemic species (Salix
divaricata subsp. kalarica, Saussurea poljakovii, Claytonia udocanica,
Taraxacum mujense, Saxifraga algisii, S. svetlanae, S. staminosa, Calamagrostis kalarica)
and an endemic monotypic genus Borodinia. The study aims to specify the spatial differentiation
frontiers of the Baikal-Dzhugdzhurian province alpine species. The following
goals are: to compile the territory alpine flora data base, to evaluate
the role of abiotic environmental factors in the alpine flora differentiation process
and to develop a regionalization scheme. A Baikal-Dzhugdzhurian province alpine
flora database was compiledusing reported data from herbarium material and
own field material, collected within Dzhugdzhur, Geran and Tukuringra mountain
ranges. It includes more than 840 plant species from above the tree line. This
number includes 550 distinct alpine species and almost 300 mountain and additional
species, which penetrate from lower altitudinal belts. As a result the territory
is divided into 16 regions corresponding with the main mountain ranges
of Baikal-Dzhugdzhurian province, floristic information about which is available.
A phytogeographical regionalization scheme including four major alpine floristic
regions was compiled using data from published regional floras, remote sensing,
digital elevation and, climatic and geologic data.
© 2012 Organizing Committee
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