2025 Ecosystem Transformation 8 (3), 151-165

Community structure and stock of phytomass of fallow abandoned arable lands in the Turano-Uyuk basin (Republic of Tyva)

Makunina N.I., Sambuu A.D. 

The features of overgrowing of abandoned arable land in the steppe intermountain TuranUyuk basin in the Republic of Tyva, the floral composition of communities, the structure of plant matter, the stages of healing and their duration are studied. The work was based on 608 samples of phytomass of fallow communities and virgin steppes, which were selected in the period from 1994 to 2023. For the first time, quantitative characteristics of reserves of living above-ground, dead above-ground and belowground phytomass at each stage of the regenerative succession of the fallow land were obtained. It has been established that currently most of the former arable land is occupied by fallow communities located at the third stage of fallow demutation, where a new association of Artemisio scopariae-Elytrigietum repentis ass. nov. obtained only between the initial (stages 1 and 2) and terminal (stages 3 and 4) stages of demutation. Significant age differences were found only between the initial (stages 1 and 2) and terminal (stages 3 and 4) stages of demutation. It is confirmed that the below-ground phytomass of the virgin steppe is higher than the communities of the terminal stages of the fallow succession.

N. I. Makunina
Central Siberian Botanic Garden, the Siberian Branch of the Russian Academy of Sciences
Zolotodolinskaya St. 101, Novosibirsk, 630090 Russia


A. D. Sambuu
Tuvan State University
Lenin St. 36, Kyzyl, Republic of Tyva, 630090 Russia

sambuu@mail.ru

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