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Table 4 CP/MAS 13C NMR of distribution of organic carbon functional group of whole soils in different sampling locations

From: 13C NMR spectroscopy characterization of particle-size fractionated soil organic carbon in subalpine forest and grassland ecosystems

Site % of C functional groups HIa ARb
Carboxyl-C Aromatic-C O-Alkyl-C Alkyl-C
Forest 7.42 12.29 51.18 29.11 0.70 0.13
Transition 7.82 14.84 49.11 26.82 0.68 0.16
Grassland 7.63 12.72 52.39 26.52 0.63 0.14
  1. aHumification degree of sampling soils: alkyl-C peak area (0–50 ppm)/O-alkyl-C peak area (50–110 ppm)
  2. bAromaticity ratio: aromatic-C peak area (110–165 ppm)/total peak area (0–165 ppm)