Medico-Ecological Characteristic of the Biogeochemical Status in the Khemchiksky Basin (Western Tuva)

The results of analysis of the chemical substances content in the soil, surface waters and floristic complexes of the Khemchiksky basin are described and the assessment of the medico-ecological situation in the region is presented. It was shown that the degree of the heavy metals movability in the soil does not demonstrate a strong correlation between the element mobility, soil grain-size distribution and high humus content and the chemical elements content is affected by the ecological-phytocenotic confinedness of the floristic complexes. At the same time the main factor determining the accumulation of the chemical elements is the habitat area. Thus, in particular, by changing of the habitat area within the same floristic complex the content of both the basic micro- and macro elements is increased. The biogeochemical situation in the Khemchiksky basin may be considered to be safe. There are separate elements in the soils (Cr, Cu, Pb) the content of which exceeds the maximum permissible concentrations. The characteristics of content of these elements in phytocenotic complexes do not depend on their content in the soils and it can be stated that in the initial link of the biological element circulation the plant communities absorb the concentrations that are not dangerous to a human and apparently to the other living organisms as well. Generally, the biogeochemical situation in the Khemchiksky basin cannot be the major factor in determining the distribution of diseases among the population except for the hypothyrosis determined by iodine deficiency.