The Impact of Atmospheric Precipitations on the Trace Elements Composition of Soil and Plant Ecosystems Lysimeters

Abstract

There was undertaking a study of сchange Lysimeters trace elements composition of soils, which occurs in 49 years in city under the influence of atmospheric precipitations and vegetation. There was observed decreasing of acidity, increasing of the organic substance’s content, trace elements and heavy metals in the surface layer of soil. Maximum accumulation of heavy metals is observed in the litter at a depts 2 – 15 cm. Zn content in a woody vegetation at 18 – 20 times higher than in original loam under herbaceous vegetation at 14 – 16 times, while plants without soils – at 5 times. The difference in the extent of accumulation of heavy metals in the soils under the model phytocenoseis and soils without plants is determined by the accumulation of biogenic and bring due to dust settling on the leaves. Elements content in the dust exceeds the content in the original loam at 100 – 300 times for zinc, 15 – 65 for lead, 5 – 41 for nickel, strontium at 10 – 40 times at different periods of time. The composition and quantity determine the extent of the amount of dust accumulation of elements in soils. In the plants of model phytocenoses indicated an increased content of heavy metals, but still defensive abilities restrict intake of excessive flow of heavy metals in plants.