Abstract. The purpose of the research is to study of yield some annual and perennial plant species which were grown in the botanical garden of the Ural Federal University. Plant species with high productivity, resistant to local soil and climatic conditions and promising for carbon sequestration have been identified. Methods. The article presents data of fresh and dry yield, carbon content of five species Amaranthus caudatus L., Amaranthus cruentus L., Amaranthus hypochondriacus L., Polygonum weyrichii F. Schmidt, Echinops sphaerocephalus L. The yield of these crops was measured in the conditions of the Middle Urals. Results. The plants P. weyrichii had the highest yield. The yield of three amaranth species was due to the C4 photosynthesis. Amaranths, being drought-resistant plants, are highly productive even in years with a hydrothermal coefficient value of less than 1.0. The plants E. sphaerocephalus is a poorly studied species that requires further study. They can be also used to deposit atmospheric carbon and grow on potential carbon farms in the changing climate of the region. In not very favorable climatic conditions in 2022, a potential carbon farm based on the monoculture of the plants P. weyrichii can bind up to 9.54 t/ha of carbon, in terms of carbon dioxide – 34.98 CO2/year per 1 ha. It is significantly higher than the level of sequestration of carbon dioxide of most trees. These values can increase by 1.5–2 times in the best climatic conditions or with additional watering. The scientific novelty lies in the fact that these plants can be used not only for fodder purposes, but also for atmospheric carbon deposition in the changing climate of region.

Abstract. The purpose of the research is to isolate species of annual and perennial herbaceous plants that are promising for the tasks of accelerating the sequestration of atmospheric carbon, resistant to local soil and climatic conditions and having high productivity from the collection fund of the botanical garden of the Ural Federal University. Methods. The article presents data on the productivity of four types of herbaceous plants: Amaranthus caudatus L., Amaranthus cruentus L., Polygonum weyrichii F. Schmidt and Echinops sphaerocephalus L., grown in the botanical garden. All the research objects were grown under the same conditions. Productivity was measured at the beginning of September. The data were processed using standard statistical methods. Results. It was revealed that the plants P. weyrichii is the most productive in terms of both fresh and dry yield. The yield of the P. weyrichii increases in years with sufficiently high moisture content. Aridity and high summer temperatures have a negative impact on the growth of the P. weyrichii. Amaranths gain a large aboveground mass due to their belonging to the group with the C4 type of photosynthesis. High summer temperatures have a positive effect on the growth and development of amaranths, while correlations with the amount of precipitation are statistically insignificant. The plants E. sphaerocephalus showed average values for productivity and requires further study. It is recommended to grow the plants P. weyrichii in a sufficiently humid area. Amaranth, being a drought-resistant plant, is highly productive in any years, especially in years with the value of the hydrothermal coefficient (HTC) less than 1.0. The scientific novelty lies in the fact that the features of the cultivation of the studied crops are considered not only for forage purposes but also from the point of view of atmospheric carbon deposition and cultivation on potential carbon farms in the changing climate of the region.