Microbial biomass and activity indices after organic substrate addition to a selenium-contaminated soil |
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Authors: | Krishan Chander Rainer Georg Joergensen |
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Institution: | (1) Department of Soil Biology and Plant Nutrition, University of Kassel, Nordbahnhofstr. 1a, 37213 Witzenhausen, Germany;(2) Department of Microbiology, Haryana Agricultural University, Hisar, India |
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Abstract: | High concentrations of Se in soil might have negative effects on microorganisms. For this reason, the effect of organic substrate
addition (glucose + maize straw) on Se volatilisation in relation to changes in microbial biomass and activity indices was
investigated using an artificially Se-contaminated soil. Microbial biomass N was reduced on average by more than 50% after
substrate addition, but adenylate energy charge (AEC) and metabolic quotient qCO2 were both increased. The Se content decreased by nearly 30% only with the addition of the organic substrate at 25°C. No significant
Se loss occurred without substrate at 25°C or with substrate at 5°C. In the two treatments with substrate addition, the substrate-derived
CO2 evolution was about 30% lower with Se addition than without. In contrast, Se had no effect on any of the other soil microbial
indices analysed, i.e. microbial biomass C, microbial biomass N, adenosine triphosphate (ATP), AEC, ATP-to-microbial biomass
C, and qCO2. |
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Keywords: | Se volatilision Microbial biomass ATP AEC qCO2 Maize straw |
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