Fig. 1: Microscale characterization of soil structure.
a Two-dimensional slices of X-ray tomograms for selected soil aggregates of the Stagnic Luvisol, Haplic Chernozem, and Fluvic Gleysol prior to Os staining. b Segmented images showing the spatial distribution of pores, POM, soil matrix, and dense areas, including rock fragments and Fe-rich nodules. Particulate organic matter is segmented into compact POM (C) and fibrous POM (F) for which one example is shown for each soil. c Difference images of the same slices displaying organic matter stained by Os. The Os concentration (OsCT) is normalized by reference materials and has arbitrary units. d The average Os concentration in each C and F example is shown as 2D maximum intensity projection through the 3D object. Scale bar represents 1 mm.
