Архив метки: communities

ECOLOGICAL-PHYTOCENOTIC CLASSIFICATION AND CHARACTERISTICS OF THE HALOCNEMETA STROBILACEI FORMATION ON THE CASPIAN LOWLAND

Arid Ecosystems

UDC 581.5.526.523

Goryaev I.A., Safronova I.N. ECOLOGICAL-PHYTOCENOTIC CLASSIFICATION AND CHARACTERISTICS OF THE HALOCNEMETA STROBILACEI FORMATION ON THE CASPIAN LOWLAND // Arid Ecosystems. 2022. Vol. 28. № 4 (93). P. 83-90. | PDF

Halocnemeta strobilacei is represented by 4 classes of associations and 14 associations on the Caspian lowland within European Russia.Сommunities of Halocnemeta strobilacei are common in desert and steppe zones, in which they differ in species composition and occupied area.

The most common are the cenoses of Halocnemeta strobilacei pura association class. Communities of two classes of associations are characteristic: Halocnemeta strobilacei halosuffruticulosa and Halocnemeta strobilacei annuae. It is rare to find communities of another class of associations Halocnemetum strobilacei graminosa. Monodominant communities of Halocnemeta strobilacei are confined to soils with a high content of chlorine ions (Cl—). In soils under bidominant cenoses, in addition to chlorine ions (Cl—), natrium ions (Na+) and sulfate ions (SO42-) have a high content.

Keywords: communities, Halocnemeta strobilacei, dwarf semishrubs, annuals, classification scheme, Caspian lowland.

Funding.The work was carried out on the planned topic of the Laboratory of General Geobotany of the BIN RAS «Vegetation of European Russia and Northern Asia: diversity, dynamics, principles of organization» No. 121032500047-1 and under the research agreement No. 1/71 dated 30.04.2021 of the BIN RAS with the World Wildlife Fund «Assessment of saiga habitats of the Northwestern Caspian Sea».

DOI: 10.24412/1993-3916-2022-4-83-90

EDN: KHCHJE

LEYMUS CHINENSIS (Trin.) Tzvelev) IN THE WESTERN TRANSBAIKALIA: STRUCTURE OF COMMUNITIES, PRODUCTS AND BIOCHEMICAL COMPOSITION DURING CLIMATE ARIDIZATION

Arid Ecosystems

Merkusheva M.G., Badmaeva N.K., Boloneva L.N., Lavrentieva I.N. LEYMUS CHINENSIS (Trin.) Tzvelev) IN THE WESTERN TRANSBAIKALIA: STRUCTURE OF COMMUNITIES, PRODUCTS AND BIOCHEMICAL COMPOSITION DURING CLIMATE ARIDIZATION // Arid ecosystems. 2021. V. 27. № 1 (86). P. 86-96. | PDF

The phytocenotic characterization of communities with Leymus chinensis growing on different types of soils of the meadow steppe, steppe floodplain, and halophytic meadows of Western Transbaikalia is considered. The botanical composition revealed glycophytes – 28 species, halotolerant glycophytes– 17 and halophytes – 6. It was established that the genus Leymus includes 3 species: Leymus chinensis, L. buriaticus, L. littoralis. The botanical composition of communities with Leymus chinensis of Western Transbaikalia is represented by 51 species, 20 families, and 40 genera. The species composition is represented mainly by the steppe complex with different xerophytic species belonging to the Asian type of range. In the biomorph, the main share falls on rhizome species, and the proportion of young infants is also significant. The similarity between the species composition is in the interval “weak – average”, which is due to the significant participation of families and genera with low species richness. The primary production communities with  Leymus chinensis is 1029–2370 g/m2×year; the aboveground phytomass almost completely forms Leymus chinensis. The biochemical composition, feed value and protein ratio of the edible dry matter are determined by the growing conditions, but on the whole they comply with standard indicators.

Keywords: Leymus chinensis, communities, species diversity, production, biochemical composition, feed value, Western Transbaikalia, climate aridization.

DOI: 10.24411/1993-3916-2021-10140