Fig. 3. Carbon-13 cross-polarization with magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectra for selected forest floor (LFH) samples, illustrating variation along Principal Component (PC) 1 and PC 2. IMM, immature, 25 to 45 yr; MAT, mature, 65 to 85 yr; OG, old-growth, >200 yr. VWS, Victoria Watershed South; VWN, Victoria Watershed North; RGC, Red Granite Creek.

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