Abstract
Population analysis of plant communities makes it possible to predict the development and transformation of natural cenoses under anthropogenic effect, to solve problems aimed at optimizing the biogeocenotic cover. The Festuca valesiaca Gaudin community was studied in the southern arid zone of Russia. The experiment was carried out in the Baskunchak-Kharabalin plain in the specially protected area of the Bogdinsko-Baskunchaksky Nature Reserve, where the grazing regime is moderate. In the first case, cenopopulations of the normal type predominate, which is an indicator of their stability and the stability of the community as a whole. Grazing intensifies the processes of vegetative reproduction and seed invasion from other cenoses. This increases the number of individuals and species diversity. Under grazing conditions, the number of non-stable – invasive and invasively regressive cenopopulations increases. The Bassia prostrata (L.) Beck (Chenopodiaceae), Astragalus dolichophyllus Pall. (Fabaceae), Agropyron desertorum (Fisch ex Link) Schult. (Poaceae), Agropyron fragile (Roth) P. Candargy (Poaceae) cenopopulations fall first out of the community composition. The dominant Festuca valesiaca centropopulation plays a significant phytocoenotic role in steppe and semi-desert biocenoses and shows a high degree of stability without changing its parameters in the grazed area. It is concluded that moderate grazing, while increasing the species diversity of the community and the number of individuals, causes destabilisation and regression of a number of non-dominant cenopopopulations.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
