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Evaluation of soil respiration characteristics to assess heavy-metal effects on soil-microorganisms using glutamic-acid as a substrate

Författare:
Publiceringsår: 1988
Språk: Engelska
Sidor: 949-954
Publikation/Tidskrift/Serie: Soil Biology and Biochemistry
Volym: 20
Nummer: 6
Dokumenttyp: Artikel
Förlag: Elsevier / Pergamon Press

Sammanfattning

Computerized continuous monitoring of soil respiration rates before and during glutamic acid decomposition in heavy metal polluted soils was used to determine four microbial parameters: basal respiration rate, substrate induced respiration rate, lag time before the exponential increase of the soil respiration rate and the specific respiration increment during the exponential phase. Both smelter- and laboratory-contaminated soils were studied.

Basal respiration rate was the parameter most inhibited (54–77%) by heavy metal contamination. Increased soil moisture resulted in increased basal respiration rate, irrespective of pollution level. The substrate-induced respiration rate after the addition of glutamic acid was strongly correlated with the basal respiration rate (r = 0.85−0.95). The change in specific respiration increment was not related to metal contamination but increased with increasing soil moisture, with an optimum at about 250% H2O based on soil organic matter (oven-dried). Lag time was the parameter best correlated with smelter-induced metal contamination (r = 0.64 and 0.75). Unlike the three other parameters, the lag time was unaffected by soil moisture, irrespective of contamination level.

Disputation

Nyckelord

  • Biology and Life Sciences

Övrigt

Published
Yes
  • Microbial Ecology
  • ISSN: 0038-0717 (Print)
  • ISSN: 1879-3428 (Online)

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