Reaction of forest soil microflora to environmental stress along a moderate pollution gradient next to an oil refinery |
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Authors: | Hannu Fritze Oili Kiikkilä Jaana Pasanen Janna Pietikäinen |
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Institution: | (1) Department of Microbiology, University of Helsinki, SF-00710 Helsinki, Finland;(2) Present address: Department of Forest Ecology, Finnish Forest Research Institute, P. O. Box 18, SF-01301 Vantaa, Finland |
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Abstract: | Twenty-five study sites were established along a 57-km-long transect in order to estimate the impact of an oil refinery, mainly
emitting sulphur dioxide (24000 t yr−1), on forest soil (F/H-horizon) chemistry and microbiology. The study demonstrated the existence of a pollution gradient which
was best represented by the logarithm of the concentration of vanadium in the analyzed F/H soil layer. Of the soil microbial
characteristics measured, including length of fungal hyphae, soil respiration, microbial biomass C and N, and percentage mass
loss of Scots pine (Pinus sylvestris) needle litter, only fungal hyphal length was suppressed by the pollution load. No reduction in basic cations (Ca, Mg, K,
and Na) in the F/H-horizon, or enrichment of soluble aluminum in the F/H-horizon of the Scots pine forest could be detected
to result from the deposition. |
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Keywords: | acidification fungal hyphae litter decomposition microbial biomass pollution soil microbiology soil respiration |
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