EDAFOLOGÍA, Vol. 10 (3), pp. 21-31, 2003
INFLUENCIA DE LA CONTAMINACION DE SUELOS CON HIDROCARBUROS SOBRE SU CALIDAD BIOQUIMICA
M. QUEVEDO DIOSES, T. HERNÁNDEZ FERNÁNDEZ, C. GARCÍA IZQUIERDO
Departamento de Conservación de Suelos y Manejo de Residuos Orgánicos. Centro de Edafología y Biología Aplicada Segura, CEBAS-CSIC. Campus Espinardo 30100 Murcia- España. E-mail: recsuelo@cebas.csic.es
Two soils, with different amounts of organic matter were contaminated with two differents products derivated of the petroleum (fuel oil and mineral oil). We investigated the influence of these pollutants on the biochemical activity of the soil, measured through of several enzymatic activies such as the oxidoreductases (dehydrogenase) and hydrolases (protease, β-glucosidase and fosfatase). The experiment was carried out in a period of 60 days, and testing different doses (2,5%, 5% and 10% fuel oil) and (2,5% and 5% mineral oil).
In general, we found that the enzymatic activies studied were higher in the soils with high content of organic matter. The results, shows that these biochemical parameters that depends of microbial populations, were very influenced by the content of organic matter. The negative effects of the hydrocarbons on the biochemical activity of the soils, was influenced by the type of contaminant and by the doses. Fuel-oil influence more negatively on the dehydrogenase activity of the soil where was added than of mineral oil. The different physical structure of the both hydrocarbons contaminants is without doubt responsible of this behaviour.
Key words: Contaminated soil, Hydrocarbon, Enzimatic activity, Organic matter