Metal(loid)s are common pollutants in soils, causing a significant toxicological risk to living organisms and to the
ecosystems. Soil basal respiration (SBR) is broadly used as indicator of metal(loid) stress in polluted soils, although
the correlation with toxicity gives in many cases contradictory results. In this paper, we study seven different
soils with contrasting properties and with different pollution levels of As, Pb, Zn, and Cu to assess the
influence of soil properties and contaminant concentration in the SBR response. In general terms, the SBR showed
toxic effects in soils with low organic-matter content and acidic pH values. Low respiration rates were found in
soils polluted with As even at very high contamination levels. According to our results, SBR is not a good indicator
of pollution by Pb, Zn and Cu in soils rich in organic carbon or in highly carbonate soils. In As-polluted soils, SBR
also showed a low sensitivity in all cases. Further studies are needed to assess the role of soil properties and the
type of pollutant in the SBR tests.
Metal(loid)s are common pollutants in soils, causing a significant toxicological risk to living organisms and to theecosystems. Soil basal respiration (SBR) is broadly used as indicator of metal(loid) stress in polluted soils, althoughthe correlation with toxicity gives in many cases contradictory results. In this paper, we study seven differentsoils with contrasting properties and with different pollution levels of As, Pb, Zn, and Cu to assess theinfluence of soil properties and contaminant concentration in the SBR response. In general terms, the SBR showedtoxic effects in soils with low organic-matter content and acidic pH values. Low respiration rates were found insoils polluted with As even at very high contamination levels. According to our results, SBR is not a good indicatorof pollution by Pb, Zn and Cu in soils rich in organic carbon or in highly carbonate soils. In As-polluted soils, SBRalso showed a low sensitivity in all cases. Further studies are needed to assess the role of soil properties and thetype of pollutant in the SBR tests.
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