gcb2681-sup-0001-TableS1.xlsapplication/msexcel22KTable S1. Comparison of 13C NMR regions obtaining using 50, 100, 200, and 300 Hz line broadening for a representative Bw soil sample.
gcb2681-sup-0002-TableS2.xlsapplication/msexcel27KTable S2. Comparison of 13C CPMAS NMR Spectra (>30% observability) with direct polarization (DP) results (>85% observability). DP NMR results show that the aromatic carbon region (110–145) estimated by 13C CPMAS is conservative. Soil samples are from the Pololu (350 ky) intermediate aged chronosequence site. The DOM sample is derived from Laupahoehoe organic soil horizons.
gcb2681-sup-0003-AdditionalReferences.pdfapplication/PDF80KAdditional references that report a positive Feo, Alo: C relationship for Fig 1 are included as supporting material.

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