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Submicron structures provide preferential spots for carbon and nitrogen sequestration in soils.
Nat. Commun. 5:2947 (2014)
The sequestration of carbon and nitrogen by clay-sized particles in soils is well established, and clay content or mineral surface area has been used to estimate the sequestration potential of soils. Here, via incubation of a sieved (<2 mm) topsoil with labelled litter, we find that only some of the clay-sized surfaces bind organic matter (OM). Surprisingly, <19% of the visible mineral areas show an OM attachment. OM is preferentially associated with organo-mineral clusters with rough surfaces. By combining nano-scale secondary ion mass spectrometry and isotopic tracing, we distinguish between new labelled and pre-existing OM and show that new OM is preferentially attached to already present organo-mineral clusters. These results, which provide evidence that only a limited proportion of the clay-sized surfaces contribute to OM sequestration, revolutionize our view of carbon sequestration in soils and the widely used carbon saturation estimates.
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Publication type
Article: Journal article
Document type
Scientific Article
Keywords
Ion Mass-spectrometry; Organic-matter; Marine-sediments; Density Fractionation; Mineral Interactions; Microbial Biomass; Extraction Method; Forest Soil; Stabilization; Preservation
ISSN (print) / ISBN
2041-1723
e-ISSN
2041-1723
Journal
Nature Communications
Quellenangaben
Volume: 5,
Article Number: 2947
Publisher
Nature Publishing Group
Publishing Place
London
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Reviewing status
Peer reviewed