Authors:
Ya. O. TIMOFEEVA, candidate of biological sciences, leading researcher of the Sector of biogeochemistry,
Federal Scientific Center of the East Asia Terrestrial Biodiversity FEB RAS, (159 Stoletiya Vladivostoka Str., 690022, Vladivostok; e-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.).
Abstract. The results of studies of trace elements compositions of soils, nodules and plants from agroecosystems of the Primorye Region were presented. The common imbalance of trace element composition of arable horizons and stable deficits of Mo, Ni and Zn in soils which intensely used in regional agricultural production was indentified. In the studied soils Cu and Co contents were increased in comparison with the regional clark concentration. The studied soils are characterized by active formation of soil nodules. Based on the study of trace elements accumulation in nodules, it was found that nodules are kind depositors of the soil system and have a significant impact on trace elements redistribution in arable soil horizon. dding of fertilizers is accompanied by additional input of total and water-soluble forms of trace elements in the soil and in the nodule. The specificity of most of the studied microelements content in wheat plants is due to the participation of elements in key metabolic processes. The result of fertilizer application is increase Pb and Cd contents in plant tissues. However, the main part of Pb and Cd which contained in plants returned to the soil as crop residues. The increase of nodules number was observed in soils of plots with adding fertilizers. Analysis of the relationship between the contents of trace elements different forms in soil, nodules and plant has been allowed to establish that functioning nodules is one of the factors limiting the intake of some trace elements in plants and most likely affect on productivity of plants. Taking into account the fact that it is impossible to increase the yield without fertilizers application and respectively without related impurities, in soils which used for agricultural production, nodules play the role of balancing component of agroecosystems, which regulates plant nutrition by environmentally safe way.
Keywords: soils, trace elements, soil nodules, biological cycle.
