Fig. 4. Soil C analyses on 1982 soils by Walkley-Black in 1982 (1982 WBC), on 1986 soils by LECO in 1986 (1986 LECO-C), on 1986 soils by Perkin-Elmer CHN analyzer in 2000 (1986 CHN-C), and on 2000 soils by Perkin-Elmer CHN analyzer in 2000 (2000 CHN-C) in the loblolly pine site. Error bars denote standard errors and letters denote significant differences (p < 0.05) using Bonferonni post-hoc tests.