title: Response of autochthonous microbiota of diesel polluted soils to land-farming treatments.
abstract: This study investigated the response of autochthonous microorganisms of diesel polluted soils to land-farming treatments. Inorganic NPK (nitrogen, phosphorous, and potassium) fertilizer and Ivey surfactant were applied alone or in combination as biostimulating agents. The study was carried out in experimental separated land-farming plots performed with two soils: a sandy clay soil with low biological activity and a sandy clay soil with higher biological activity, contaminated with two concentrations of diesel: 10,000 and 20,000mgkg(-1). Bacterial growth, dehydrogenase activity and CO2 production were the biological parameters evaluated. Non-metric multidimensional scaling analysis proved that moisture content showed a tendency related to microbial growth and that heterotrophic and degrading microorganisms had the best relationship. Initial biological activity of soil influenced the response with 11.1% of variability attributed to this parameter. Soils with low activity had higher degree of response to nutrient addition.
authors.affiliation: Institute of Water Research, University of Granada, Spain.
authors.forename: Gloria Andrea
authors.initials: GA
authors.lastname: Silva-Castro
authors.affiliation: Institute of Water Research, University of Granada, Spain.
authors.forename: Imane
authors.initials: I
authors.lastname: Uad
authors.affiliation: Institute of Water Research, University of Granada, Spain; Department of Civil Engineering, University of Granada, Spain.
authors.forename: Alfonso
authors.initials: A
authors.lastname: Rodríguez-Calvo
authors.affiliation: Department of Microbiology, University of Granada, Spain; Institute of Water Research, University of Granada, Spain.
authors.forename: Jesús
authors.initials: J
authors.lastname: González-López
authors.affiliation: Department of Microbiology, University of Granada, Spain; Institute of Water Research, University of Granada, Spain. Electronic address: ccalvo@ugr.es.
authors.forename: Concepción
authors.initials: C
authors.lastname: Calvo
mesh_terms: D000383:Agriculture; D001419:Bacteria / Q000187:drug effects; D018407:Bacterial Physiological Phenomena; D004305:Dose-Response Relationship, Drug; D005308:Fertilizers / Q000032:analysis; D005742:Gasoline / Q000633:toxicity*; D064307:Microbiota / Q000187:drug effects*; D012988:Soil Microbiology; D012989:Soil Pollutants / Q000633:toxicity*; D013030:Spain; D013501:Surface-Active Agents / Q000737:chemistry
chemical_list: D005308:Fertilizers; D005742:Gasoline; D012989:Soil Pollutants; D013501:Surface-Active Agents
keywords: Bioremediation; Diesel pollution; Inorganic fertilizer; Land-farming; Surfactant