Fig. 6: Cluster analysis of spatially resolved C K-edge and Fe L-edge STXM–NEXAFS spectra showing greater chemical heterogeneity in the rhizosphere. | Communications Earth & Environment

Fig. 6: Cluster analysis of spatially resolved C K-edge and Fe L-edge STXM–NEXAFS spectra showing greater chemical heterogeneity in the rhizosphere.

From: Root exudates simultaneously form and disrupt soil organo-mineral associations

Fig. 6

Elemental maps of C (a, g), and Fe (d, j), cluster maps of C (b, h) and Fe (e, k), and cluster spectra of C (c, i), and Fe (f, l) collected from moist rhizosphere and non-rhizosphere samples. Colors in cluster maps correspond to colors in cluster spectra. For C K-edge, spectral features identified by the vertical dashed lines correspond to C in quinonic (284.3 eV) (a), aromatic (285.2 eV) (b), phenolic (286.4 eV) (c), aliphatic (287.3 eV) (d), carboxylic (288.5 eV) (e), and O-alkyl (289.5 eV) (f) functional groups. For Fe L-edge, spectral features identified by vertical dashed lines correspond to Fe(II) (707.8 eV) (i), and Fe(III) (709.5 eV) (ii). White bars: 5 µm.

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