Plant versus microbial signature in densimetric fractions of Mediterranean forest soils: a study by thermochemolysis gas chromatography mass spectrometry

Plant versus microbial signature in densimetric fractions of Mediterranean forest soils: a study... Purpose Soil organic matter (SOM) ageing may be measured by means of molecular signatures, ratios between organic com- pounds which inform us about the origin and/or the degree of biochemical evolution of (or microbial contribution to) specific groups of compounds: lipids, proteins, carbohydrates, etc. Owing to the biochemical heterogeneity of decomposing substrates, it is unlikely that the degree of biochemical evolution can be approached with a single ratio. Nevertheless, obtaining a wide collection of molecular signatures can be costly. Materials and methods Instead of applying specific methods to obtain a collection of ratios, we apply thermally assisted hydrolysis and methylation (THM), followed by GC-MS, to obtain a panoramic view of SOM composition. From the compounds identified after THM, several ratios were obtained. Three ratios are based on aliphatic compounds: (1) ratio between short-chain (≤ 20 C) and long-chain (> 20 C) alkanoic acids, (2) ratio between branched and long-chain alkanoic acids, (3) ratio between short- chain (C18) and long-chain (C22–C24) alkanols. Four ratios are based on lignin-derived monomers: (4) vanillic acid to vanillin, (5) syringic acid to syringaldehyde, (6) a combination of the two previous, and (7) the syringyl- to total lignin monomers. Finally, three ratios are based on http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Soils and Sediments Springer Journals

Plant versus microbial signature in densimetric fractions of Mediterranean forest soils: a study by thermochemolysis gas chromatography mass spectrometry

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Publisher
Springer Berlin Heidelberg
Copyright
Copyright © 2018 by Springer-Verlag GmbH Germany, part of Springer Nature
Subject
Environment; Soil Science & Conservation; Environment, general; Environmental Physics
ISSN
1439-0108
eISSN
1614-7480
D.O.I.
10.1007/s11368-018-2046-8
Publisher site
See Article on Publisher Site

Abstract

Purpose Soil organic matter (SOM) ageing may be measured by means of molecular signatures, ratios between organic com- pounds which inform us about the origin and/or the degree of biochemical evolution of (or microbial contribution to) specific groups of compounds: lipids, proteins, carbohydrates, etc. Owing to the biochemical heterogeneity of decomposing substrates, it is unlikely that the degree of biochemical evolution can be approached with a single ratio. Nevertheless, obtaining a wide collection of molecular signatures can be costly. Materials and methods Instead of applying specific methods to obtain a collection of ratios, we apply thermally assisted hydrolysis and methylation (THM), followed by GC-MS, to obtain a panoramic view of SOM composition. From the compounds identified after THM, several ratios were obtained. Three ratios are based on aliphatic compounds: (1) ratio between short-chain (≤ 20 C) and long-chain (> 20 C) alkanoic acids, (2) ratio between branched and long-chain alkanoic acids, (3) ratio between short- chain (C18) and long-chain (C22–C24) alkanols. Four ratios are based on lignin-derived monomers: (4) vanillic acid to vanillin, (5) syringic acid to syringaldehyde, (6) a combination of the two previous, and (7) the syringyl- to total lignin monomers. Finally, three ratios are based on

Journal

Journal of Soils and SedimentsSpringer Journals

Published: Jun 2, 2018

References

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