Effects of a cadmium-contaminated sewage sludge compost on dynamics of organic matter and microbial activity in an arid soil |
| |
Authors: | J L Moreno T Hernández C Garcia |
| |
Institution: | (1) Department of Soil and Water Conservation and Organic Resources Management, Centro de Edafología y Biología Aplicada del Segura – CSIC, P.O. Box 4195, E-30080 Murcia, Spain e-mail: recsuelo@natura.cebas.csic.es, Fax: +34-968-266613, ES |
| |
Abstract: | An incubation experiment lasting 120 days was carried out to ascertain the effect on the soil microbial activity and organic
matter mineralization of adding a sewage sludge compost contaminated with two different levels of Cd to an arid soil. Two
composts, with a low (2 mg kg–1) and high (815 mg kg–1) Cd content, respectively, were used in this experiment. Both composts increased the total organic C, humic substance and
water-soluble C contents, the beneficial effects still being noticeable after 120 days of incubation. The most labile C fraction
(water-soluble C) was the most sensitive to the high Cd content. The high Cd concentration decreased soil microbial biomass
C and stimulated the metabolic activity of the microbial biomass, the metabolic quotient (qCO2) revealing itself to be a very sensitive index of the stress that the incorporation of a Cd-contaminated sewage sludge compost
causes in a soil. The effect of Cd contamination on enzyme activities (urease, protease that hydrolyse N-α-benzoil-l-arginamide, phosphatase, and β-glucosidase) depended on the enzyme studied.
Received: 10 September 1997 |
| |
Keywords: | Sewage sludge compost Cadmium contamination Soil organic matter Soil microbial activity Incubation experiment |
本文献已被 SpringerLink 等数据库收录! |
|