Abstract
The associations formed by Alnus incana (L.) Moench. in the south of Western Siberia are limited to the middle and lower reaches of the Irtysh river in the Tyumen region (Tobolsk district, Russia). The paper describes Alnetum pteridiosum, Alnetum urticosum, Alnetum еquisetosum, Alnetum coricosum, Alnetum coricoso – еquisetosum, Alnetum coricoso – oxalidosum, Alnetum curtico – еquisetosum, Alnetum еquisetoso – miliosum, Alnetum coricosa – stellariosum, Alnetum urtico – aegopodiosum, Alnetum urtico – stellariosum, Alnetum–cirsiosum, Alnetum cystopteriosum, Alnetum urtico – miliosum, Alnetum poо – urticosum, Alnetum chrysospleniosum, Alnetum corydaliosum, Alnetum impatieno - urticosum and Alnetum stellariosum associations. In these associations, more than a hundred of species of higher plants grow. The species composition analysis showed that they are mesothermal and hydrophilic, the shrub layer is not typical for them, and the grass cover of alder forests is not uniform in origin. During the formation of Alnetum association they interact with taiga, birch and linden forests through mutual exchange of species, and also experience anthropogenic influences, accompanied by the penetration of synanthropic species.
Highlights
IntroductionFormations of species of Alnus genus with cenoformers Alnus glutinosa (L.) Grаeth. (black alder forests) and Alnus incana (L.) Moench. (gray alder forests) aroused a certain interest of botanists in connection with the problem of their origin [1, 2]
Formations of species of Alnus genus with cenoformers Alnus glutinosa (L.) Grаeth. and Alnus incana (L.) Moench. aroused a certain interest of botanists in connection with the problem of their origin [1, 2]
Within the city of Tobolsk, gray alder forests are most saturated with anthropogenic synanthropic species; in the nearterrace floodplain, gray alder forests are enriched with species of black alder forests that migrated along the Irtysh floodplain; in the Aremzyanka River basin, they reflect the Pleistocene stage of their genesis
Summary
Formations of species of Alnus genus with cenoformers Alnus glutinosa (L.) Grаeth. (black alder forests) and Alnus incana (L.) Moench. (gray alder forests) aroused a certain interest of botanists in connection with the problem of their origin [1, 2]. An analysis of the species composition of the complex of the described associations Alnus incana showed their different genesis. Gray alder (Alnus incana) is a tree growing along the banks of rivers, moor edges, in meadows. In the Kurgan region and in the north of the range in the Khanty-Mansiysk Okrug, Alnus incana is a companion species, as a cenose former it forms gray alder forests, which are most fully represented in the Irtysh basin of the Tyumen region. The aim of the study was a complete inventory of the species of Alnus incana associations in three dislocations of the Tobolsk region with an elucidation of their genesis
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