Salt concentrations seasonal dynamics in the artificial spruce plants territory in an urbanized environment

The purpose of research is to study the seasonal dynamics of salt concentrations and establish relationships between the concentrations of toxic salts in technogenic soil, the ratio of the contents of various salts and the physiological state of two ornamental spruce species, such as dwarf spruce Picea Canadensis Conica and blue prickly spruce Picea Pungens Glauca, growing on this soil in an urbanized environment. Cultivation has been carried out since 2016 without the use of fertilizers on sandy, highly stony technogenic soil with a profile thickness of about 40 cm. Irrigation is carried out only with rainwater. The site is located in the residential zone of the Oktyabrsky District of Irkutsk (Irkutsk Region). Seasonal fluctuations in the concentrations of carbonates (CaCO3, MgCO3, FeCO3), as well as water-soluble mineral salts, both non-toxic (Ca(HCO3)2, CaSO4) and toxic (Mg(HCO3)2, MgSO4, Na2SO4, NaCl, MgCl2) were identified in technogenic soil as a result of research. Relationships have been established between the total concentrations of toxic magnesium salts (MgSO4, MgCl2), CaCO3: MgCO3 in the soil and the physiological state of dwarf spruce trees Picea Canadensis Conica, which are susceptible to sunburn of needles in the spring (March, April). In the soil selected from the trunk circles of healthy spruce trees of this species, CaCO3 : MgCO3 varies from 2 : 1 to 3.8 : 1. Blue prickly spruces Picea Pungens Glauca is one of the species resistant to growing conditions in an urbanized environment. The increase in the total concentration of toxic magnesium salts (MgSO4, MgCl2) after the end of the growing season, as well as sharp fluctuations in CaCO3 : MgCO3 from 6,6 : 1 to 1,3 : 1, did not affect the physiological state of the blue spruce Picea Pungens Glauca.