Research the samples toxicity of urbanozems, polluted by heavy metals

Choice of biodiagnostics methods influences on assessment the quality of environment. At samples of urbanozem, polluted by compounds of heavy metals to dangerous levels, methods of bioindication have established the structural changes in algo-cyano-mycologic complexes connected with increase in share of melanized forms of fungi and cyanobacterial component of these complexes. Testing the water extracts from samples has shown the natural oppression of dehydrogenase activity in cyanobacterias Nostoc. Among biotesting express methods the test on physical activity of Paramecium caudatum is most informative. The biotest on the Ekolyum test system wasn't sensitive. The problem of interpretation the results of biodiagnostics in the conditions of low bioavailability of heavy metals due to buffer properties of soils is discussed.