Mechanism of Migration Processes of Heavy Metals (Zn, Cu, Pb, Cd) in Agroecosystems by the Example of Cabbage and Fodder Beet (Root Crops)
The studies of heavy metals behaviour into the components of "soil -plant" system is an important task of contemporary ecology, focused on scientific substantiation of permissible limits of man impact to natural complexes and agroecosystems, and control and regulation of chemical elements content in plant products. The paper presents an analysis of heavy metals migration in the system "soil -agricultural plants" based on accumulation coefficients of Cu, Zn, Pb, Cd on example of cabbage and
... r beet (root crops). The analysis was performed by statistical methods. It was detected that distributions of accumulation coefficients of Cu, Zn, Pb, Cd for cabbage and fodder beet (root crops) in most cases do not follow the normal distribution law. It was shown that in the range of considered chemical elements the distributions of accumulation coefficients for cabbage could be presented as descending order: Zn > Cu > Cd > Pb. It was established that soil type determines 52 % of variations of Cu accumulation in fodder beet (Fisher's ratio test is 9.22 at confidence level of p=0.0019). To the greater degree a variation of Zn accumulation in fodder beet could be caused by unsuspected factors (82 %). In this case the influence of soil type has also a higher probability (Fisher's ratio test is 2.0423 at confidence level of p=0.12), that highlights the significant effect of soil type on the processes of microelements accumulation by plant organism.