DNOC, a model pollutant, adversely affects ...
Type de document :
Compte-rendu et recension critique d'ouvrage
Titre :
DNOC, a model pollutant, adversely affects the potential of soil microbial communities to mineralise the herbicide 2,4-D : an investigation using micro-sampling procedures
Auteur(s) :
Lors, Christine [Auteur]
Centre National de la Recherche Scientifique [CNRS]
Centre for Materials and Processes [CERI MP - IMT Nord Europe]
Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 [LGCgE]
Lagacherie, Bernard [Auteur]
Microbiologie
Chabanet, Claire [Auteur]
FLAveur, VIsion et Comportement du consommateur [FLAVIC]
Soulas, Guy [Auteur]
Oenologie [UMRO]
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Centre National de la Recherche Scientifique [CNRS]
Centre for Materials and Processes [CERI MP - IMT Nord Europe]
Laboratoire de Génie Civil et Géo-Environnement (LGCgE) - ULR 4515 [LGCgE]
Lagacherie, Bernard [Auteur]
Microbiologie
Chabanet, Claire [Auteur]
FLAveur, VIsion et Comportement du consommateur [FLAVIC]
Soulas, Guy [Auteur]
Oenologie [UMRO]
Titre de la revue :
Soil Biology and Biochemistry
Pagination :
1023-1032
Éditeur :
Elsevier
Date de publication :
2005
ISSN :
0038-0717
Mot(s)-clé(s) :
SOIL AGGREGATES
AGREGAT DU SOL
AGREGAT DU SOL
Mot(s)-clé(s) en anglais :
2,4-D
DNOC
SOIL QUALITY
RISK ASSESSMENT
MICRO-SAMPLING
DNOC
SOIL QUALITY
RISK ASSESSMENT
MICRO-SAMPLING
Discipline(s) HAL :
Sciences du Vivant [q-bio]/Sciences agricoles/Science des sols
Résumé en anglais : [en]
The effects of the herbicide, DNOC, 4,6-dinitro-o-cresol, a model pollutant, have been studied by comparing the potential of soil microbial communities present in individual soil aggregates or in larger soil microcosms as ...
Lire la suite >The effects of the herbicide, DNOC, 4,6-dinitro-o-cresol, a model pollutant, have been studied by comparing the potential of soil microbial communities present in individual soil aggregates or in larger soil microcosms as samples of soil aggregates to mineralise the herbicide 2,4D. We have shown that 2-3 mm soil aggregates vary widely in their 2,4-D mineralisation potential and that ageing or exposure to DNOC considerably simplified the distribution patterns of this capacity. The main factors of variation have been quantified and classified using a quasi-likelihood method derived from the Generalised Linear Model approach. Besides DNOC concentration and duration of exposure, an additional 'rank' factor reflecting a desiccation gradient of the aggregates on the microliter plates was found to have statistical significance. We concluded that it should be possible to derive an experimental approach, designated as 'functional profiling', with potential use to detect soil chemical contamination. Curves of 2,4-D mineralisation in individual soil aggregates could be classified according to three different types of kinetics, which were assumed to reflect heterogeneous spatial distribution, differences in microbial community composition and varying efficiency of the microbial consortia involved in 2,4-D degradation. Exposure to DNOC considerably simplified the distribution patterns of the different types of kinetics with one type, showing slow rate and low cumulative mineralisation, becoming predominant as ageing, concentration and duration of DNOC exposure increased. We argue on the possible use of 'kinetic profiling' as a sensitive bioindicator of soil quality. By comparison, in soil microcosms, 2,4-D mineralisation showed an extra mineralisation potential of 64% over individual aggregates in the control soil and exposure to DNOC was followed by concentration and time-dependent recovery of the 2,4-D mineralisation potential. It is likely that 2 g size soil microcosms gather a larger number of biochemical capacities which could complement each other to increase the potential of soil to mineralise xenobiotic compounds. (c) 2004 Elsevier Ltd. All fights reserved.Lire moins >
Lire la suite >The effects of the herbicide, DNOC, 4,6-dinitro-o-cresol, a model pollutant, have been studied by comparing the potential of soil microbial communities present in individual soil aggregates or in larger soil microcosms as samples of soil aggregates to mineralise the herbicide 2,4D. We have shown that 2-3 mm soil aggregates vary widely in their 2,4-D mineralisation potential and that ageing or exposure to DNOC considerably simplified the distribution patterns of this capacity. The main factors of variation have been quantified and classified using a quasi-likelihood method derived from the Generalised Linear Model approach. Besides DNOC concentration and duration of exposure, an additional 'rank' factor reflecting a desiccation gradient of the aggregates on the microliter plates was found to have statistical significance. We concluded that it should be possible to derive an experimental approach, designated as 'functional profiling', with potential use to detect soil chemical contamination. Curves of 2,4-D mineralisation in individual soil aggregates could be classified according to three different types of kinetics, which were assumed to reflect heterogeneous spatial distribution, differences in microbial community composition and varying efficiency of the microbial consortia involved in 2,4-D degradation. Exposure to DNOC considerably simplified the distribution patterns of the different types of kinetics with one type, showing slow rate and low cumulative mineralisation, becoming predominant as ageing, concentration and duration of DNOC exposure increased. We argue on the possible use of 'kinetic profiling' as a sensitive bioindicator of soil quality. By comparison, in soil microcosms, 2,4-D mineralisation showed an extra mineralisation potential of 64% over individual aggregates in the control soil and exposure to DNOC was followed by concentration and time-dependent recovery of the 2,4-D mineralisation potential. It is likely that 2 g size soil microcosms gather a larger number of biochemical capacities which could complement each other to increase the potential of soil to mineralise xenobiotic compounds. (c) 2004 Elsevier Ltd. All fights reserved.Lire moins >
Langue :
Anglais
Vulgarisation :
Non
Source :
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