ontogenetic structure

Dynamics of the demographic structure and variability of some morphological parameters of Calophaca wolgarica (Fabaceae) during reintroduction to the Saratov region

Preliminary results of studies on the reintroduction of Calophaca wolgarica to the territory of the Saratov region are presented. In the period from 2018 to 2020, the age structure of artificial plantings and changes in the morphological parameters of individuals within them were studied. It is shown that on the territory of the Saratov region, artificial plantings of this species are best located near the protected area “Tulip Steppe near the village of Maksyutovo”.

Population status and variation of the rare species Dactylorhiza viridis (L.) R. M. Bateman, Pridgeon & M. W. Chase (Orchidaceae) under anthropogenic load conditions in the meadow phytocenoses of the Central Caucasus

We studied the variation of morphological characters, ontogenetic structure and vitality of seven cenopopulations of Dactylorhiza viridis (L.) R. M. Bateman, Pridgeon & M. W. Chase within the Kabardino-Balkar Republic in 2015–2019. The studies were conducted in the meadow plant communities under different conditions of anthropogenic load (recreation and grazing). The species presents medium phytocenotic plasticity of morphological characters (I p=36–70%) and high variation of morphological characters (CVх–ср=18,55–45,22%) under changeable conditions of growth.

Ontogenetic Structure and Population Status of the Relict Species of Hedysarum gmelinii Ledeb. in the Cis-Urals Republic of Bashkortostan

The results of studying the ontogenetic structure of coenopopulations of the relict species Hedysarum gmelinii Ledeb. in the Bashkortostan of Republic are presented. The investigated cenopopulations growing on slopes of different exposure, with a slope of 35°, is the main type of vegetation – Helictotrichon desertorum–Stipa korshinskyi petrophyte steppe, anthropogenic load is low or medium. The overall density of the coenopopulations of H. gmelinii varies from 1,7 to 12,2 ind./m2, an effective density from 1,5 to 4,6 ind./m2.