Yakovyshyna T. Development of scientific bases for monitoring system improvement of hazardous compounds migration in soil of urban ecosystem

The peculiarities and regularities of the factors influence of the anthropogenic activity to the processes of the ecological danger formation in technogenically loaded urban ecosystems has been revealed due to the presence and migration of the dangerous metal compounds in contaminated urban soils as the quintessence of the scientific bases for the improving monitoring system. It has been established that the concentration and hazard coefficients determined by the total content of the metal cations (Pb, Cd, Zn, Cu, Ni) in the soil are 2 orders of magnitude lower in contrast to the coefficients determined by the content of their migrating compounds. It should be taken into account in the monitoring system of urban ecosystem soils to prevent false management decisions in the natural and protective activities of technogenically loaded territories. The formula for the quantifying of the soil buffering ability to the contamination of the hazardous metal compounds has been proposed as the difference between the MPC and their total content at low migration capacity in contrast to the ball assessment by V.B.Il’yn. The necessity of the taking into account the shortage and excess of the content of the metals cations in the urban ecosystems soil has been proved during the evaluation of the environmental hazard of the polyelemental contamination for the environment and health of the city population based on the established correlation coefficients and regression equations between the coefficient of the metals cations imbalance (Pb, Zn, Cu, Cd, Ni), phytotoxicity of the soil and the mortality rate of children up to the 1-st year. The ecologically acceptable criterial value is substantiated < 7 for the urban ecosystem of Dnipro. The phytoremediation technologies has been scientifically substantiated and developed to the soils of the urban ecosystems contaminated by the hazardous metal compounds, the essence of which has been the phytostabilization of soils by the proposed plant dekoncentrator (alfalfa sowing (Medicago sativa)), or phytoextraction of metal cations by the proposed plant – hyper accumulator (perennial ryegrass (Lolium perenne)).