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Hydrolase activity, microbial biomass and community structure in long-term Cd-contaminated soils

hal.structure.identifierUniversità degli Studi di Firenze = University of Florence = Université de Florence [UniFI]
dc.contributor.authorRENELLA, Giancarlo
hal.structure.identifierBiodiversité, Gènes et Ecosystèmes [BioGeCo]
dc.contributor.authorMENCH, Michel
hal.structure.identifierBrookhaven National Laboratory [Upton, NY] [BNL]
dc.contributor.authorVAN DER LELIE, D.
hal.structure.identifierUniversità degli Studi di Firenze = University of Florence = Université de Florence [UniFI]
dc.contributor.authorPIETRAMELLARA, G.
hal.structure.identifierUniversità degli Studi di Firenze = University of Florence = Université de Florence [UniFI]
dc.contributor.authorASCHER, J.
hal.structure.identifierUniversità degli Studi di Firenze = University of Florence = Université de Florence [UniFI]
dc.contributor.authorCECCHERINI, M.T.
hal.structure.identifierUniversità degli Studi di Firenze = University of Florence = Université de Florence [UniFI]
dc.contributor.authorLANDI, Loretta
hal.structure.identifierUniversità degli Studi di Firenze = University of Florence = Université de Florence [UniFI]
dc.contributor.authorNANNIPIERI, Paolo
dc.date.issued2004
dc.identifier.issn0038-0717
dc.description.abstractEnLong-term effects of high Cd concentrations on enzyme activities, microbial biomass and respiration and bacterial community structure of soils were assessed in sandy soils where Cd was added between 1988 and 1990 as Cd(NO3)(2) to reach concentrations ranging from 0 to 0.36 mmol Cd kg(-1) dry weight soil. Soils were mantained under maize and grass cultivation, or 'set-aside' regimes, for 1 year. Solubility of Cd and its bioavailability were measured by chemical extractions or by the BIOMET bacterial biosensor system. Cadmium solubility was very low, and Cd bioavailability was barely detectable even in soils polluted with 0.36 mmol Cd kg(-1). Soil microbial biomass carbon (BC) was slightly decreased and respiration was increased significantly even at the lower Cd concentration and as a consequence the metabolic quotient (qCO(2)) was increased, indicating a stressful condition for soil microflora. However, Cd-contaminated soils also had a lower total organic C (TOC) content and thus the microbial biomass C-to-TOC ratio was unaffected by Cd. Alkaline phosphomonoesterase, arylsulphatase and protease activities were significantly reduced in all Cd-contaminated soils whereas acid phosphomonoesterase, beta-glucosidase and urease activites were unaffected by Cd. Neither changes in physiological groups of bacteria, nor of Cd resistant bacteria could be detected in numbers of the culturable bacterial community. Denaturing gradient gel electrophoresis analysis of the bacterial community showed slight changes in maize cropped soils containing 0.18 and 0.36 mmol Cd kg(-1) soil as compared to the control. It was concluded that high Cd concentrations induced mainly physiological adaptations rather than selection for metal-resistant culturable, soil microflora, regardless of Cd concentration, and that some biochemical parameters were more sensitive to stress than others
dc.language.isoen
dc.publisherElsevier
dc.subjectSOL POLLUE
dc.subject.enENZYM ACTIVITIES
dc.subject.enBIOAVAILABILITY
dc.subject.enMICROBIAL COMMUNITY
dc.title.enHydrolase activity, microbial biomass and community structure in long-term Cd-contaminated soils
dc.typeArticle de revue
dc.identifier.doi10.1016/j.soilbio.2003.10.022
dc.subject.halSciences du Vivant [q-bio]/Sciences agricoles/Science des sols
bordeaux.journalSoil Biology and Biochemistry
bordeaux.page443-451
bordeaux.volume36
bordeaux.issue3
bordeaux.peerReviewedoui
hal.identifierhal-02682648
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-02682648v1
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