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Soil Carbon and Nitrogen Changes in Forests of Walker Branch Watershed, 1972 to 2004

^a Natural Resources and Environmental Science, Fleischmann Agriculture Bldg. 370, Univ. of Nevada, Reno, NV 89557
^b Environmental Sciences Division, Oak Ridge National Lab., P.O. Box 2008, Building 1059, Oak Ridge, TN 37831-6422
^c USDA Forest Service, 2730 Savannah Hwy., Charleston, SC 29141
^d Natural Resources and Environmental Science, 1000 Valley Rd., Univ. of Nevada, Reno, NV 89512

View larger version (19K): [in this window] [in a new window]   Fig. 1. Soil C and N concentrations and C/N ratios in the A (0–15 cm) and Bt (45–60 cm) horizons in the 24 core plots measured in 1972 and 2004 on Walker Branch watershed, Tennessee. Darkened circles indicate statistically significant differences for unpaired Student's t-tests within an individual plot and open circles show nonsignificant changes. Diamonds show changes in average plot values, with darkened diamonds indicating statistically significant differences for paired Student's t-tests.

View larger version (25K): [in this window] [in a new window]   Fig. 2. Soil C concentrations in the eight core plots of Walker Branch watershed, Tennessee, between 1972 and 2004 (for the 0–15- and 45–60-cm depths) and between 1982 and 2004 for the intermediate depths. Average values not sharing the same letters are significantly different from one another (LSD, P 0.05).

View larger version (24K): [in this window] [in a new window]   Fig. 3. Soil N concentrations in the eight core plots of Walker Branch watershed, Tennessee, between 1972 and 2004 (for the 0–15- and 45–60-cm depths) and between 1982 and 2004 for the intermediate depths. Average values not sharing the same letters are significantly different from one another (LSD, P 0.05).

View larger version (23K): [in this window] [in a new window]   Fig. 4. Soil C/N ratios in the eight core plots of Walker Branch watershed, Tennessee, between 1972 and 2004 (for the 0–15- and 45–60-cm depths) and between 1982 and 2004 for the intermediate depths. Average values not sharing the same letters are significantly different from one another (LSD, P 0.05)

View larger version (41K): [in this window] [in a new window]   Fig. 5. Average ecosystem C and N contents in the eight intensively sampled plots of Walker Branch watershed, Tennessee. Bars not sharing the same uppercase letters on top represent total ecosystem contents that are significantly different from one another. Bars not sharing the same lowercase letters for a segment represent differences in live vegetation, detritus (litter + dead vegetation), or soil contents in 0 to 15 or 0 to 60 cm that are significantly different from one another.