Abstract
The aim of this study was to measure and compare methane oxidation rates of arable and grassland soils that received 7.5tha−1y−1 of noncontaminated aerobically treated sewage sludge for ten years. Arable soils showed generally lower methane oxidation rates (from 6 to 15∗10−3h−1) than grassland soils (from 26 to 33∗103h−1). Oxidation rate constants (k) of soils amended with sewage sludge were remarkably close to their respective untreated controls, but a soil, that had received a tenfold sewage sludge application (i.e. 75tha−1y−1), showed a statistically significantly higher k-value. Laboratory addition of up to 1000mgPbg−1 soil to this soil did not cause any significant change in methane oxidation, but caused a decrease from 13.9 to 10.9×10−3h−1 in the control soil. Addition of Zn was much more toxic than Pb, with a significant decrease at 300μgg−1 soil rate and an almost complete inhibition at 1500μgg−1 soil rate. Higher resistance was evident of sewage sludge treated soil in comparison to control soil, for both biomass C and CH4 oxidation activity.
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