Influence of polychlorinated biphenyls on microbial biomass and its activity in grassland soil
1996
Dusek, L. | Tesarzhova, M (Marta)
Microbial biomass content, soil respiration and biomass specific respiration rate were measured in two parts of an area polluted by a municipal waste incinerator [polychlorinated biphenyls (PCBs) from combustion processes]. The soils in the studied parts differed significantly only in their levels of PCBs. The concentration of PCBs found in a control plot (4.4 ng g-1 soil) can be regarded as a background value while the polluted plot contained an increased amount of PCBs (14.0 ng g-1 soil). A significantly lower microbial biomass (decreased by 23%, based on the chloroform-fumigation extraction technique) and a lower specific respiration rate (decreased by 14%) were observed in the polluted plot in comparison with the control plot at the end of experimental period (1992-1994). Furthermore, a lower ability of microorganisms in the polluted plot to convert available C(org) into new biomass was found in laboratory incubations with glucose-amended samples.
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