Pedosphere 20(6): 681--691, 2010
ISSN 1002-0160/CN 32-1315/P
©2010 Soil Science Society of China
Published by Elsevier B.V. and Science Press
| Effects of different types of sludge on soil microbial properties:A field experiment on degraded Mediterranean soils |
D. TARRASÓN1 , G. OJEDA2, O. ORTIZ1, J. M. ALCAÑIZ1 |
1 Centre for Ecological Research and Forestry Applications, Autonomous University of Barcelona, E-08193 Bellaterra (Spain)
2 IMAR-Coimbra Interdisciplinary Centre, Department of Zoology, University of Coimbra, 3004-517 Coimbra (Portugal) |
| ABSTRACT |
| The recycling of suitable organic wastes can enhance soil fertility via effects on soil physical, chemical and biological properties. To compare the effects of digested (DS), thermally dried (TDS) and composted dewatered (CDS) sewage sludge on soil microbiological properties, an experiment was conducted at field sites for more than one year (401 d) when applied to two Mediterranean degraded soils (loam and loamy sand soils). All three types of sewage sludge had a significant effect on measured parameters. In a short time, the plots of both loamy sand and loam soils amended with TDS showed the highest microbial basal respiration (loam soil: P < 0.01; loamy sand soil: P < 0.001) and carbon mineralization coefficient (loam soil: P < 0.01; loamy sand soil: P < 0.001). Furthermore, on loamy sand soil, the plots amended with TDS showed the highest microbial metabolic quotient (qCO2) (P < 0.05). This study revealed that the addition of sludge caused transient non-equilibrium effects on almost all soil microbial properties. However, there were no differences one year later because the remaining organic carbon was stable and quite similar in all treatments. These results may have practical implications for the rehabilitation of degraded soils. |
| Key Words: basal respiration, composted sludge, soil microbial biomass, thermally dried sludge |
| Citation: TarrasÓn, D., Ojeda, G., Ortiz, O. and AlcaÑiz, J. M. 2010. Effects of different types of sludge on soil microbial properties:A field experiment on degraded Mediterranean soils. Pedosphere. 20(6): 681-691. |
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