کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4429141 | 1619812 | 2012 | 9 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Land application of aerobic sewage sludge does not impair methane oxidation rates of soils Land application of aerobic sewage sludge does not impair methane oxidation rates of soils](/preview/png/4429141.png)
The aim of this study was to measure and compare methane oxidation rates of arable and grassland soils that received 7.5 t ha− 1 y− 1 of noncontaminated aerobically treated sewage sludge for ten years. Arable soils showed generally lower methane oxidation rates (from 6 to 15 ∗ 10− 3 h− 1) than grassland soils (from 26 to 33 ∗ 103 h− 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. 75 t ha− 1 y− 1), showed a statistically significantly higher k-value. Laboratory addition of up to 1000 mg Pb g− 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− 3 h− 1 in the control soil. Addition of Zn was much more toxic than Pb, with a significant decrease at 300 μg g− 1 soil rate and an almost complete inhibition at 1500 μg g− 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.
► Sewage sludge application increased soil microbial biomass and soil organic C.
► Aerobically treated sewage sludge soil application did not impair methane oxidation.
► Zn addition showed a strong negative effect on soil methane oxidation.
► Sewage sludge application increased microbial resistance to Pb and Zn additions.
Journal: Science of The Total Environment - Volume 441, 15 December 2012, Pages 10–18