Biogeochemical Redistribution of Lead in an Urban Ecosystem be the Example of Irkutsk Territory
O. V. SHERGINA and T. A. MIKHAILOVA
Siberian Institute of Plant Physiology and Biochemistry Siberian Branch of the Russian Academy of Sciences
sherolga80@mail.ru, mikh@sifibr.irk.ru
Keywords: urban ecosystem, technogenic lead income, genetic soil profile, woody plants
Pages: 195-200
Abstract
Lead content in woody vegetation at the genetic profile level was investigated at the territory of Irkutsk, a large industrial centre of Eastern Siberia. It was demonstrated that lead income caused by technogenic emissions contributes significantly to the pollution of the urban ecosystem. Lead accumulation in needles and leaves of the woody plants at the urban area can exceed the background levels more than 10 times, maximally up to 25 times. The high level of lead is also revealed in the top humus and humus accumulative horizons. Its active vertical migration into textural illuvial and pedogenic horizons of the soil genetic profile was discovered. It is shown that the redistribution of the labile lead in the soil solution of the organic and mineral horizons is accompanied by its interaction with phosphate and sulphate ions, exchange cations (sodium, potassium, magnesium), and heavy metal ions (zinc, copper, cadmium, manganese). Reliable direct correlations between the content of mobile lead in urban soil and lead concentration in the assimilative organs of woody plants are revealed.
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