Modern trends in the dynamics of soil and vegetation cover of meadows of high ecological level in the Volga river delta

At the present day in the Volga river delta in relation to hydrological regime, climate changes and human economic activities, environmental assessment and environmental changes are imperative for sustained development and region ecological safe development, the necessary element of which is soil and vegetation monitoring. The differences were specified in the dynamics of highly soluble salts in high, medium and low ecological levels soil grounds as the result of reconnaissance, conducted in the Volga river delta from 1979 till 2011. Highly soluble salts reduction was specified in the years with aqueous runoff low volume for the second quarter and its increase in the years with overflow high level in relation to the deep subsoil water occurrence and exudative hydrological regime predomination under flushing on the high level grounds. Besides, there is derating CL/SO 4 and soil solution toxic level reduction under aqueous runoff volume for the second quarter less than 80 cubic km in soil ground of this level. Vegetation community productivity directive increase was specified from the beginning of attendance till 2006, however in the following years there was some high soluble salts in the ground, soil solution toxic increase thus vegetation productivity reduction in relation to annual average air temperature growth, rainfall amount and aqueous runoff volume reduction.