Fig. 1From: 13C NMR spectroscopy characterization of particle-size fractionated soil organic carbon in subalpine forest and grassland ecosystemsCP/MAS 13C NMR spectra of whole soils in the O/A horizon in forest (FR), transition (TR), and grassland (GS) sites. a carboxyl-C, b aromatic-C, c O-alkyl-C, d alkyl-CBack to article page