Biology and Fertility of Soils

, Volume 6, Issue 1, pp 9–13 | Cite as

Microbial biomass and activity in urban soils contaminated with Zn and Pb

  • H. Ohya
  • S. Fujiwara
  • Y. Komai
  • M. Yamaguchi
Article
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Summary

The effects of heavy metals on microbial biomass and activity were investigated in 30 urban soils, contaminated mainly with Zn and Pb to different extents, in terms of the physicochemical and biological characteristics of the soils. Evaluated by simple and multiple regression analyses, the microbial biomass was not affected significantly by easily soluble Zn + Pb (extractable with 0.1 NHCI). The biomass was accounted for as a function of cation exchange capacity (CEC), total organic C and the numbers of fungal colonies present (R2 = 0.692). Carbon dioxide evolution from soils, which reflected microbial activity, was studied on soils incubated with microbial-promoting substrates (glucose and ammonium sulfate) or without. Carbon dioxide evolution was negatively related to Zn+Pb, and this inhibitory effect of the metals was greater in the soils incubated with substrates. Carbon dioxide evolution in soils with substrates was closely related to Zn+Pb, bacterial numbers and the numbers of fungal colonies (R2 = 0.718). Carbon dioxide evolution in soils without substrates was accounted for as a function of Zn + Pb, biomass and the C/N ratio (R2 = 0.511). Using these relationships, the effects of heavy metals on soil microorganisms are discussed in terms of metabolically activated and dormant populations.

Key words

Soil respiration ATP Heavy metal effects Dormant population Microbial biomass Urban soils 
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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • H. Ohya
    • 1
  • S. Fujiwara
    • 1
  • Y. Komai
    • 1
  • M. Yamaguchi
    • 1
  1. 1.Department of Agricultural ChemistryUniversity of Osaka PrefectureSakai, OsakaJapan

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