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Table 3 Variation in soil organic C, total N, C:N ratio, hydrolysable N, available P, and total P. Data are the mean ± standard error

From: Effects of simulated acid rain on soil respiration and its component in a mixed coniferous-broadleaved forest of the three gorges reservoir area in Southwest China

Treatment Soil organic C (mg∙g−1) Total N (mg∙g−1) C:N ratio Hydrolysable N (mg∙g−1) Available P (mg∙kg−1) Total P (mg∙g−1)
UTCK 18.17 ± 3.19a 1.46 ± 0.24a 12.41 ± 0.32a 0.21 ± 0.01a 1.62 ± 0.77a 0.41 ± 0.03a
UT4.0 21.91 ± 1.77b 1.54 ± 0.16a 14.23 ± 0.24b 0.18 ± 0.02b 1.5 ± 0.54a 0.22 ± 0.04b
UT3.25 25.99 ± 3.61c 1.65 ± 0.22a 15.77 ± 0.49c 0.15 ± 0.02c 1.34 ± 0.59a 0.23 ± 0.02b
UT2.5 25.61 ± 3.04d 1.64 ± 0.18a 17.81 ± 0.45d 0.15 ± 0.01c 1.41 ± 0.80a 0.36 ± 0.03c
TCK 19.76 ± 2.18a 1.49 ± 0.17a 13.26 ± 0.47a 0.22 ± 0.01a 1.66 ± 0.71a 0.39 ± 0.03a
T4.0 20.84 ± 2.58a 1.59 ± 0.21a 13.11 ± 0.28a 0.24 ± 0.01a 1.83 ± 0.70a 0.21 ± 0.02b
T3.25 29.11 ± 1.53b 1.59 ± 0.07a 18.33 ± 0.36b 0.14 ± 0.01b 1.59 ± 0.84a 0.20 ± 0.04b
T2.5 29.12 ± 3.04b 1.50 ± 0.15a 19.44 ± 0.44b 0.19 ± 0.02c 2.02 ± 0.51a 0.34 ± 0.04c
  1. Values followed by different letters are significantly different between treatments (P < 0.05). UTCK, UT4.0, UT3.25, and UT2.5 indicate control, pH 4.0, pH 3.25, and pH 2.5 simulated acid rain in the untrenched plots, respectively; TCK, T4.0, T3.25, and T2.5 indicate the control, pH 4.0, pH 3.25, and pH 2.5 simulated acid rain in the trenched plots, respectively