Characterization of a Mediterranean litter by 13C CPMAS NMR; relationships between litter depth, enzyme activities and temperature

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doi: 10.1111/j.1365-2389.2007.01003.x
Authors:Alarcón-Gutiérrez, E.; Floch, C.; Ziarelli, F.; Albrecht, R.; Le Petit, J.; Augur, C.; Criquet, S.
Author Affiliations:Primary:
Université Paul Cézanne. Institut Méditerranéen d'Ecologie et Paléoécologie, Laboratoire d'Ecologie Microbienne, Marseille, France
Volume Title:European Journal of Soil Science
Source:European Journal of Soil Science, 59(3), p.486-495. Publisher: Wiley-Blackwell on behalf of the British Society of Soil Science, and the National Societies of Soil Science in Europe, Oxford, United Kingdom. ISSN: 1351-0754
Publication Date:2008
Note:In English. 38 refs.; illus., incl. 3 tables
Summary:Organic matter mineralization of forest litter is catalysed by various extracellular enzymes produced by microorganisms. Coupling enzyme activities with data on the general macromolecular structure of organic matter, from cross-polarization m.a.s. 13C NMR (13C CPMAS NMR) provides insights into organic matter degradation processes. The effect of the T of incubation on the degradation processes was evaluated in three distinct layers (OhLn, OhLv and OhLf) of an evergreen oak litter (Quercus ilex L.), located in the Mediterranean area of SE France. Degradation phenomena were studied by a combination of 13C CPMAS NMR and microbiological analysis. To determine the microbial activity of litter layers, three enzyme activities (laccase, cellulase and butyrate esterase) were measured in a 6-month mesocosm study. Results showed an increase in the alkyl C to O-alkyl-C ratio and an increase of the phenolic C and carboxyl C regions, indicating a preferential degradation of polysaccharides. Aromatisation also increased with litter depth and degradation, and humification processes were more elevated at 30°C. ANOVA showed significant effects (P < 0.001) of increased T, depth and time of degradation on microbiological variables. Further information is needed about the variations in T and T-litter response and soil functions to link fundamental understanding of carbon stabilization, climate change and global C cycling. [G.L.B.]
Sections:Environmental studies
Subsections:Organic geochemistry
Subjects:Biogenic processes; Carbohydrates; Carbon cycle; Cellulose; Climate change; Degradation; Depth; Enzymes; Experimental studies; Forests; Geochemical cycle; MAS NMR spectra; NMR spectra; Organic compounds; Polysaccharides; Proteins; Soils; Spectra; Stabilization; Temperature; Europe; France; Var France; Western Europe; Forest litter; La Gardiole de Rians
Coordinates:N433427 N433427 E0054210 E0054210
Abstract Numbers:08M/2283
Record ID:2016108129
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom
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