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Table 6 Characteristics of the fertility of soil organic horizons in pine, spruce and birch forests

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
pine (n = 66) spruce (n = 37) birch (n = 16) pine (n = 66) spruce (n = 37) birch (n = 16) pine (n = 66) spruce (n = 37) birch (n = 16) pine (n = 66) spruce (n = 37) birch (n = 16)
pH CaCl2 −4.48 1.18 4.93 3.33 3.58 4.06 0.36 0.43 0.56 3.51 0.48 0 0.237 0
pH H2O −3.83 0.60 4.77 4.31 4.50 4.99 0.37 0.44 0.58 4.46 0.48 0 0.548 0
Total C (g∙kg− 1) 3.22 −1.33 −2.88 409 369 325 72 89 119 385 89.22 0.001 0.183 0.004
Total N (g∙kg−1) −4.49 3.73 1.48 9.8 12.6 12.1 2.76 3.20 3.46 11.0 3.27 0 0 0.140
С/N 5 −3 −3 45 30 27 18 8 9 38 16 0 0 0.003
Exchangeable aciditya 4.25 −2.00 −3.49 4.96 3.80 2.79 1.80 1.58 1.49 4.31 1.86 0 0.046 0
Exchangeable Caa −4.96 2.74 3.52 10.6 15.0 17.5 3.98 5.49 7.3 12.9 5.66 0 0.006 0
Exchangeable Mga −4.51 0.87 5.39 2.09 2.95 4.95 1.03 1.36 2.81 2.74 1.75 0 0.385 0
Exchangeable Ka −1.72 0.77 1.46 2.39 2.58 2.76 0.78 0.71 0.90 2.50 0.78 0.085 0.439 0.145
Exchangeable Naa 2.45 −1.01 −2.20 0.13 0.11 0.09 0.06 0.06 0.05 0.12 0.06 0.014 0.313 0.028
Exchangeable Ala 3.13 −1.37 −2.70 1.35 0.88 0.41 1.24 0.66 0.33 1.08 1.05 0.002 0.171 0.007
Exchangeable Mna −3.07 1.94 1.85 0.81 1.09 1.18 0.48 0.56 0.59 0.95 0.54 0.002 0.053 0.065
BS (%) −5.21 2.69 3.94 74.0 83.0 89.4 11.0 9.0 6.4 78.9 11.4 0 0.007 0
Extractable P (mg∙kg− 1) −3.88 2.58 2.16 700 814 840 127 184 215 754 170 0 0.010 0.031
  1. acmol(+)∙kg−1