Changes in the microbial activity of an arid soil amended with urban organic wastes |
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Authors: | J A Pascual C García T Hernandez M Ayuso |
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Institution: | (1) Department of Soil and Water Conservation and Organic Waste Management, Centro de Edafología y Biología Aplicada del Segura (CEBAS-CSIC), PO Box 4195, E-30080 Murcia, Spain, ES |
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Abstract: | Changes produced in the biological characteristics of an arid soil by the addition of various urban wastes (municipal solid
waste, sewage sludge and compost) at different doses, were evaluated during a 360-day incubation experiment. The addition
of organic materials to the soil increased the values of biomass carbon, basal respiration, biomass C/total organic C ratio
and metabolic quotient (qCO2), indicating the activation of soil microorganisms. These biological parameters showed a decreasing tendency with time. Nevertheless,
their values in amended soils were higher than in control soil, which clearly indicates the improvement of soil biological
quality brought about by the organic amendment. This favorable effect on soil biological activity was more noticeable with
the addition of fresh wastes (municipal solid waste or sewage sludge) than with compost. In turn, this effect was more permanent
when the soil was amended with municipal solid waste than when it was amended with sewage sludge.
Received: 28 May 1996 |
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Keywords: | Microbial biomass C Basal respiration qCO2 Arid soil Urban organic wastes Compost Sewage sludge |
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