Home – Home – Jornals – Contemporary Problems of Ecology 2020 number 1

The results of the study of the dynamics of elements of seed productivity amfilikt Hierochloё repens (Host) Beauv. (2 n = 28) and the optional apomict Hierochloё odorata (L.) Beauv. (2 n = 42) (Poaceae) are presented. The plants were grown in the absence of competition and in single-species artificial cenoses with low (5 plants/m²) and high (20 plants/m²) starting density. It was found that plants according to the classification of ecological strategies belong to K-species, the expenses of reproduction was 1.8-5.8 % of the biomass of an individual. The reproductive capacity of two-year cenoses depended on the starting density of plants. In low-density cenoses, plants had 2.4-2.7 times fewer generative shoots compared to high-density cenoses. The influence of species features (F₁) on fruiting abundance varied with age. At two-year coenosis proportion of influence of this factor on the number of generative shoots per unit area was 43,11 % (F₁ = 16,12 %), from three-year - 60,04 % (F₁ = 31,26 %) have a four-year - of 29.19 % (F₁ = 7,24 %; F₀₅ = 4,49; F₀₁ = 8,53). Intrapopulation correlation of indicators of reproduction of the dimension indicators individuals clarified, expressed through the mass and proportion of organ weight from the biomass of individuals. The real seed productivity of H. repens plants was 2.2 times higher in individuals and 1.4 times higher in cenoses compared to H. odorata . Reproductive imbalance in H. odorata is associated with polyploidy and the possibility of apomixis.