How does the change of biogeocenosis begin?

The primary change of biogeocenosis begins with bare rocks, loose sands, talus, swaths, which were created by man. Biogeocenosis is an open, self-regulating, stable system capable of metabolism and energy. The biogeocenosis is part of the biosphere. It consists of abiotic and biotic components, characterized by productivity, biomass, population density, its components, and species diversity. The living components of the biogeocenosis are producers, consumers and decomposers, due to which there is a continuous circulation of substances and energy conversion.