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Table 5 Characteristics of the fertility of soil organic horizons in Cajander’s forest site types

From: Associations between forest vegetation and the fertility of soil organic horizons in northwestern Russia

Parameters v-test Mean in category Standard deviation in category Overall mean Overall standard deviation p-value
OMTa (n = 18) MT (n = 48) VT (n = 45) OMT (n = 18) MT (n = 48) VT (n = 45) OMT (n = 18) MT (n = 48) VT (n = 45) OMT (n = 18) MT (n = 48) VT (n = 45)
pH CaCl2 1.59 1.79 −2.72 3.67 3.60 3.35 0.52 0.54 0.37 3.51 0.48 0.113 0.073 0.006
pH H2O 0.55 1.57 −1.82 4.52 4.55 4.36 0.50 0.53 0.41 4.46 0.48 0.583 0.116 0.069
Total C (g∙kg− 1) 1.32 − 1.60 0.59 411 369 391 98.6 93.2 79.9 385 89 0.188 0.109 0.558
Total N (g∙kg− 1) 3.76 1.88 −4.00 13.7 11.7 9.4 3.95 2.97 2.31 11.0 3.27 0 0.060 0
С/N −2 −2 3 32 34 44 10 19 13 38 16 0.062 0.037 0.005
Exchangeable acidityb −0.28 − 1.18 1.72 4.19 4.06 4.68 2.12 1.78 1.86 4.31 1.86 0.781 0.237 0.086
Exchangeable Cab 3.02 1.83 −3.21 16.6 14.1 10.8 6.38 5.39 4.71 12.9 5.66 0.003 0.067 0.001
Exchangeable Mgb 2.02 1.03 −1.97 3.52 2.95 2.34 2.88 1.61 1.24 2.74 1.75 0.043 0.301 0.049
Exchangeable Kb 3.41 2.55 −3.66 3.08 2.72 2.16 0.88 0.64 0.63 2.50 0.78 0.001 0.011 0
Exchangeable Nab −0.78 −2.18 2.33 0.11 0.10 0.13 0.04 0.05   0.12 0.06 0.432 0.029 0.020
Exchangeable Alb −0.55 − 0.07 0.70 0.95 1.07 1.16 0.82 1.20 1.06 1.08 1.05 0.586 0.946 0.482
Exchangeable Mnb 1.06 0.80 −1.38 1.08 1.00 0.86 0.58 0.58 0.49 0.95 0.54 0.287 0.422 0.169
BS (%) 1.84 2.22 −3.17 83.4 81.7 74.6 9.5 9.2 12.6 78.9 11.4 0.066 0.026 0.002
Extractable P (mg∙kg−1) 1.08 0.40 −0.73 794 763 739 217 153 164 754 170 0.282 0.623 0.468
  1. aOMT – Oxalis-Myrtillus, MT – Myrtillus, VT – Vaccinium vitis-idaea; b – cmol(+)∙kg− 1