Fig. 4. Carbon-13 cross-polarization with magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectra for selected forest floor root (LFH-ROOT) samples, illustrating variation along Principal Component (PC) 1 and PC 2. The dipolar dephasing (DD) spectrum is also shown for Sample 11. REG, regeneration, 3 to 8 yr; IMM, immature, 25 to 45 yr; MAT, mature, 65 to 85 yr. VWS, Victoria Watershed South; KOK, Koksilah; NIT, Nitinat.