EXCHANGE PROPERTIES AND ACID MODE OF SOIL UNDER AEROTECHNOGENIC CONTAMINATION OF TERRITORIES
The results of investigations of the impact of cement production emissions on the formation of ash-laden black soil agrochemical characteristics at a distance of 20 km from the source of man-caused emissions are stated. It was found that directed changes in soil absorbing complex are generated under the influence of calcium cement dust, due to the remoteness of the study area from the source of its emission. The most significant changes were observed in the 2-km zone of influence. In this area the contents of Ca, the sum of absorbed bases and absorption capacity outnumbered the output parameters of the soil ecosystem by up to seven times, and the proportion of Ca in absorption capacity increased from 85 to 98%. Enriching the soil with exchangeable bases caused its alkalinization, resulting in lowering of hydrolytic acidity to 10 times. Outside this zone the mentioned parameters stabilize at more moderate levels, but they are significantly higher than clarke numbers, and at a distance of 20 km from the emission source they are close to the regional background parameters. K e y w o r d s: pollution, ash-laden black soil, soil absorbing complex, agrochemical characteristics, exchange properties of soil, acidity of soil solution.