Trace Elements in Medicine (Moscow)
2017, 18(4): 36−40
PECULIARITIES OF LEAD CONTENT IN SOILS AND PLANTS OF CENTRAL SIBERIA
A.E. Pobilat 1, E.I. Voloshin 2
1 Krasnoyarsk State Medical University, Partizan Zheleznyak str. 1, Krasnoyarsk 660022, Russia
2 Krasnoyarsk State Agricultural University, Mira ave. 90, Krasnoyarsk 660049, Russia
ABSTRACT. The gross content of lead in arable soils of Central Siberia fluctuates from 1.1 to 68.5 mg/kg. The maximum content of lead in soils surpasses its minimum concentration 62.3 times. The contents and spatial distribution of lead in soils of different natural zones of the region is determined by unequal conditions of soil formation and differences in particle size distribution of soil forming rocks. The highest average content of lead is observed in a subtaiga zone, Achinsk-Bogotol and Nazarovo steppe zones. The lowered concentration of lead is noted in light in particle size distribution soils of Minusinsk forest-steppe zone. The background content of lead in soils on the area of 2.54 million hectares is equal to 11.4 mg/kg or 1.1 Clark. No lead pollution of soils revealed in the surveyed territory. Its maximum content in soils is 1.9 times lower than the accepted sanitary standards. The amount of mobile lead depends on the pH of soil solution, the gross lead content, particle size distribution and humus content of soils. In chernozems, gray forest, dark-brown and dark-colored inundated soils the amount of lead fluctuates from 0.05 to 0.66 mg/kg and makes 1.1– 3.9% of the gross content. The concentration of lead in crops changes depending on weather conditions, amount of mobile form of an element in soils and on biological features of plants. Among grain crops, a higher content of lead (0.30 mg/kg) was found in oats. In average concentration of lead, brome (0.38 mg/kg) surpasses clover (0.26 mg/kg) and natural motley grass (0.24 mg/kg). Vegetable cultures and potatoes slightly differ in lead content of the productive part of plants (0.10–0.13 mg/kg). Low content of lead in soils and plants guarantees receiving ecologically safe crop production in agrocenosis of Central Siberia.
KEYWORDS: soil, lead, gross content, mobile form, cultures, productivityCorresponding author: Pobilat A.E.; E-mail: firstname.lastname@example.org © Trace Elements in Medicine (Moscow), 2017