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Harvesting and Climate Effects on Organic Matter Characteristics in British Columbia Coastal Forests

^a Pacific Forestry Centre, Natural Resources Canada, 506 West Burnside Rd., Victoria, BC, Canada V8Z 1M5
^b Dep. of Chemistry, University of British Columbia, Vancouver, BC, Canada V6T 1W5

View larger version (40K): [in a new window]   Fig. 1. Principal component analysis (PCA) score plots for the five organic matter pools from the Coastal Forest Chronosequence (CFC) plots: (a) fine woody debris (FWD), (b) forest floor (LFH), (c) forest floor roots (LFH-ROOT), (d) mineral soil fraction, 2 to 8 mm (MIN-ROOT), (e) mineral soil fraction, <2 mm (MIN-FLOAT).

View larger version (19K): [in a new window]   Fig. 2. Carbon-13 cross-polarization with magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectra for selected fine woody debris (FWD) samples, illustrating variation along Principal Component (PC) 1. REG, regeneration, 3 to 8 yr; OG, old-growth, >200 yr. VWS, Victoria Watershed South; NIT, Nitinat; RGC, Red Granite Creek.

View larger version (15K): [in a new window]   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.

View larger version (16K): [in a new window]   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.

View larger version (26K): [in a new window]   Fig. 5. Carbon-13 cross-polarization with magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectra for selected 2- to 8-mm mineral soil fraction (MIN-ROOT) samples, illustrating variation along Principal Component (PC) 1 and PC 2 (a). The central region with six samples in close proximity is expanded in (b). Inserts show dipolar dephasing (DD) spectra for selected samples. Strong features from wood, tannins, and char are indicated by W, T, and C, respectively.

View larger version (21K): [in a new window]   Fig. 6. Carbon-13 cross-polarization with magic-angle spinning nuclear magnetic resonance (CPMAS NMR) spectra for selected <2-mm mineral soil fraction (MIN-FLOAT) samples, illustrating variation along Principal Component (PC) 1 and PC 2. Inserts show dipolar dephasing (DD) spectra for Samples 71 and 72.

View larger version (20K): [in a new window]   Fig. 7. Carbon-13 nuclear magnetic resonance (NMR) spectra at 75 MHz for the 2- to 8-mm mineral soil fraction (MIN-ROOT) Plot 11: (a) cross-polarization with magic-angle spinning (CPMAS); (b) CP with total suppression of sidebands (TOSS); (c) single-pulse excitation (SPE) after background correction; and (d) dipolar dephasing (DD) with total suppression of sidebands (TOSS). Main spinning sidebands (SSB) are indicated by *.

View larger version (20K): [in a new window]   Fig. 8. Carbon-13 nuclear magnetic resonance (NMR) spectra at 75 MHz for the <2-mm mineral soil fraction (MIN-FLOAT) Plot 11: (a) cross-polarization with magic-angle spinning (CPMAS); (b) CP with total suppression of sidebands (TOSS); (c) single-pulse excitation (SPE) after background correction; and (d) dipolar dephasing (DD) with TOSS.