Localization of soil organic matter in soil aggregates using synchrotron-based X-ray microtomography

verfasst von

Stephan Peth, Claire Chenu, Nelly Leblond, Anneka Mordhorst, Patricia Garnier, Naoise Nunan, Valérie Pot, Malte Ogurreck, Felix Beckmann

Abstract

Modelling carbon mineralisation in natural soils is a major topic in soil and climate research. Current models need to be improved to include soil structure as an influencing factor to better predict C fluxes between pedosphere and atmosphere and to estimate carbon sequestration potentials. Geometry-based mechanistic modelling approaches have recently been developed to systematically study the effect of soil structure on carbon decomposition. Such models require spatially explicit input parameters describing the architecture of the pore space and the heterogeneous distribution of microbes and organic matter as decomposable substrate. The latter is very difficult to determine in situ, resulting in increased uncertainty in the models. To obtain more realistic input data, we have developed a novel approach to locate soil organic matter (SOM) in undisturbed aggregates of soil using a combination of synchrotron-based X-ray microtomography and osmium as a staining agent for SOM. Here, we present the first results using 5mm sized soil aggregate samples with contrasting C-contents in which we obtained maps of organic matter distributions in relation to the pore networks at the aggregate scale.

Externe Organisation(en)

Universität Kassel
AgroParisTech - Université Paris-Saclay
Christian-Albrechts-Universität zu Kiel (CAU)
Institut national de recherche pour l’agriculture, l’alimentation et l’environnement (INRAE)
Helmholtz-Zentrum Geesthacht Zentrum für Material- und Küstenforschung GmbH

Typ

Artikel

Journal

Soil Biology and Biochemistry

Band

78

Seiten

189-194

Anzahl der Seiten

6

ISSN

0038-0717

Publikationsdatum

11.2014

Publikationsstatus

Veröffentlicht

Peer-reviewed

Ja

ASJC Scopus Sachgebiete

Mikrobiologie, Bodenkunde

Ziele für nachhaltige Entwicklung

SDG 13 – Klimaschutzmaßnahmen

Elektronische Version(en)

https://doi.org/10.1016/j.soilbio.2014.07.024 (Zugang: Unbekannt)