Presented reserves of mineral elements in ecosystems tundra. The total reserves of elements in plants and their dead remains increase from the shrub-lichen communities to shrub-moss. The main part of the elements accumulated in decomposing organic matter. The presence of significant reserves of plant organic matter and the stability of the biological cycle of elements largely determine the preservation of tundra biocenosis. Elements in stockpiles biomass and mortmass can be represented by the following series: Ca > N > Fe > Al > К > Mg > S > P.