The measurements of all forms of atmospheric fallout, migration of heavy metals (HM) in soil water, in soluble and suspended form, and the stream output from a small watershed were examined. The geochemistry of Pb, Zn, Cd and Cu in a polluted ecosystem of oak forests has been studied. The process of HM fixation is concurrent with the process of their migration in the more energy saturated soil-plant part of an ecosystem. The main factor of HM migration is water-soluble organic compounds. The basic pool of accumulation of HM is a thin layer of mull; plants support a high HM load.