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Identification of Distinct Functional Microstructural Domains Controlling C Storage in Soil

Steffens, Markus; Rogge, Derek M.; Mueller, Carsten W.; Höschen, Carmen; Lugmeier, Johann; Kölbl, Angelika and Kögel-Knabner, Ingrid (2017) Identification of Distinct Functional Microstructural Domains Controlling C Storage in Soil. Environmental Sciences & Technologiy, 51 (21), pp. 12182-12189.

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Document available online at: https://pubs.acs.org/doi/full/10.1021/acs.est.7b03715


The physical, chemical, and biological processes forming the backbone of important soil functions (e.g., carbon sequestration, nutrient and contaminant storage, and water transport) take place at reactive interfaces of soil particles and pores. The accessibility of these interfaces is determined by the spatial arrangement of the solid mineral and organic soil components, and the resulting pore system. Despite the development and application of novel imaging techniques operating at the micrometer and even nanometer scale, the microstructure of soils is still considered as a random arrangement of mineral and organic components. Using nanoscale secondary ion mass spectroscopy (NanoSIMS) and a novel digital image processing routine adapted from remote sensing (consisting of image preprocessing, endmember extraction, and a supervised classification), we extensively analyzed the spatial distribution of secondary ions that are characteristic of mineral and organic soil components on the submicrometer scale in an intact soil aggregate (40 measurements, each covering an area of 30 μm × 30 μm with a lateral resolution of 100 nm × 100 nm). We were surprised that the 40 spatially independent measurements clustered in just two complementary types of micrometer-sized domains. Each domain is characterized by a microarchitecture built of a definite mineral assemblage with various organic matter forms and a specific pore system, each fulfilling different functions in soil. Our results demonstrate that these microarchitectures form due to self-organization of the manifold mineral and organic soil components to distinct mineral assemblages, which are in turn stabilized by biophysical feedback mechanisms acting through pore characteristics and microbial accessibility. These microdomains are the smallest units in soil that fulfill specific functionalities.

EPrint Type:Journal paper
Keywords:Department of Soil Sciences, Climate Impact of Organic Agriculture, soil functions
Subjects: Soil > Soil quality
Research affiliation: Switzerland > FiBL - Research Institute of Organic Agriculture Switzerland > Soil > Soil quality
Germany > University of Munich - TUM
Germany > Other organizations
DOI:DOI: 10.1021/acs.est.7b03715
Related Links:http://www.fibl.org/en/themes/climate-change.html
Deposited By: Forschungsinstitut für biologischen Landbau, FiBL
ID Code:33262
Deposited On:01 Jun 2018 10:07
Last Modified:19 May 2021 14:15
Document Language:English
Refereed:Peer-reviewed and accepted

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