Journal
SOIL BIOLOGY & BIOCHEMISTRY
Volume 42, Issue 2, Pages 379-382Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.soilbio.2009.11.004
Keywords
Polysaccharides; Subsoil; Stabilisation
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Funding
- Deutsche Forschungsgemeinschaft [KO1035/19-3]
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We investigated the polysaccharide composition of bulk and mineral-bound (density fractions >2 g cm(-3)) organic matter in topsoil and subsoil horizons of a Podzol and a Cambisol. Total sugar contents were generally higher in the Cambisol than in the Podzol. For most horizons of both soils, the sugars were enriched in the mineral-bound organic matter fraction. This fraction showed a monosaccharide distribution typical for microbial sugars, whereas in bulk soil horizons higher contributions of plant-derived sugars were observed. A strong relationship with the (14)C activity of the dense fraction suggests that microbial-derived polysaccharides are most likely stabilised preferentially by mineral interactions compared to plant-derived polysaccharides. (C) 2009 Elsevier Ltd. All rights reserved.
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