Fig. 6. Soil C/N ratio on 1982 soils by Walkley-Black and Kjeldahl digestion in 1982 (1982 WBC/KJN), on 1986 soils by LECO and Kjeldahl digestion in 1986, (1986 LECO/KJN), on 1986 soils by Perkin-Elmer CHN analyzer in 2000 (1986 CHN), and on 2000 soils by Perkin-Elmer CHN analyzer in 2000 (2000 CHN) in the loblolly pine site. Error bars denote standard errors and letters denote significant differences (p < 0.05) using Bonferonni post-hoc tests.

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