Molecular turnover time of soil organic matter in particle-size fractions of an arable soil

The composition and molecular residence time of soil organic matter (SOM) in four particle‐size fractions (POM >200 µm, POM 63–200 µm, silt and clay) were determined using Curie‐point pyrolysis/gas chromatography coupled on‐line to mass spectrometry. The fractions were isolated from soils, either...

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Bibliographic Details
Published in:Rapid communications in mass spectrometry 2009-08, Vol.23 (16), p.2551-2558
Main Authors: Bol, Roland, Poirier, Natacha, Balesdent, Jérôme, Gleixner, Gerd
Format: Article
Language:English
Subjects:
Carbon Isotopes - analysis
Organic Chemicals - chemistry
Particle Size
Soil - analysis
Triticum - chemistry
Zea mays - chemistry
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Summary:The composition and molecular residence time of soil organic matter (SOM) in four particle‐size fractions (POM >200 µm, POM 63–200 µm, silt and clay) were determined using Curie‐point pyrolysis/gas chromatography coupled on‐line to mass spectrometry. The fractions were isolated from soils, either continuously with a C3 wheat (soil 13C value = −26.4‰), or transferred to a C4 maize (soil 13C value = −20.2‰) cropping system 23 years ago. Pyrograms contained up to 45 different pyrolysis peaks; 37 (ca. 85%) were identifiable compounds. Lignins and carbohydrates dominated the POM fractions, proteins were abundant, but lignin was (nearly) absent in the silt and clay fractions. The mean turnover time (MRT) for the pyrolysis products in particulate organic matter (POM) was generally
ISSN:0951-4198
1097-0231
DOI:10.1002/rcm.4124