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Table 7 Characteristics of the fertility of soil organic horizons in Sukachev’s forest types within the Cajander’s forest site types 2–4

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)
2-OMT (pine n = 7, spruce n = 7, birch n = 4)
 pH CaCl2 − 1.62 0.16 1.71 3.42 3.70 4.08 0.57 0.40 0.44 3.67 0.52 0.105 0.872 0.087
 pH H2O −0.89 − 0.75 1.93 4.38 4.40 4.96 0.61 0.24 0.50 4.52 0.50 0.372 0.452 0.054
 Total C (g∙kg− 1) 0.54 0.54 0.43 427 427 430 107 107 37.13 411 99 0.590 0.590 0.667
 Total N (g∙kg− 1) 1.88 1.88 0.82 15.9 15.9 15.1 2.00 2.00 4.70 13.66 3.95 0.060 0.060 0.410
 С/N 2 −2 0 37 27 30 11 6 8 32 10 0.054 0.102 0.730
 Exchangeable aciditya 1.47 −0.83 −0.75 5.14 3.66 3.47 2.83 1.31 1.60 4.19 2.12 0.141 0.405 0.453
 Exchangeable Caa −2.41 0.77 1.92 12.0 18.1 22.2 1.33 5.97 7.64 16.6 6.38 0.016 0.443 0.054
 Exchangeable Mga −1.67 −0.67 2.74 2.06 2.93 7.09 0.44 1.66 4.26 3.52 2.88 0.095 0.503 0.006
Exchangeable Ka 0.47 − 0.93 0.54 3.20 2.83 3.29 1.05 0.86 0.68 3.08 0.88 0.641 0.355 0.591
 Exchangeable Naa −0.15 1.01 −1.00 0.11 0.12 0.09 0.03 0.04 0.05 0.11 0.04 0.879 0.314 0.317
 Exchangeable Ala 2.10 −0.45 −1.94 1.47 0.84 0.23 1.05 0.33 0.07 0.95 0.82 0.036 0.652 0.053
 Exchangeable Mna −2.71 0.60 2.48 0.60 1.18 1.73 0.30 0.46 0.41 1.08 0.58 0.007 0.549 0.013
 BS (%) −1.95 0.68 1.48 77.8 85.4 89.8 10.6 7.71 5.64 83.4 9.54 0.052 0.494 0.139
 Extractable P (mg∙kg−1) −2.69 0.72 2.31 616 842 1022 108 140 238 794 217 0.007 0.470 0.021
3-MT (pine n = 17, spruce n = 23, birch n = 8)
 pH CaCl2 −2.14 −0.23 3.06 3.38 3.58 4.14 0.38 0.44 0.74 3.60 0.54 0.032 0.818 0.002
 pH H2O −1.96 −0.20 2.79 4.34 4.53 5.02 0.31 0.49 0.72 4.55 0.53 0.050 0.839 0.005
 Total C (g∙kg−1) 2.37 −0.66 −2.16 412 360 303 75.5 84.5 115 369 93.2 0.018 0.510 0.031
 Total N (g∙kg−1) −1.68 1.84 −0.31 10.7 12.5 11.4 3.36 2.78 2.11 11.7 2.97 0.093 0.066 0.753
 С/N 3 −2 −1 44 30 27 27 8 10 34 19 0.007 0.094 0.219
 Exchangeable acidity 2.44 −0.82 −2.04 4.92 3.84 2.87 1.79 1.63 1.46 4.06 1.78 0.015 0.414 0.041
 Exchangeable Ca −2.15 0.73 1.78 11.8 14.7 17.2 3.13 5.09 8.14 14.1 5.39 0.031 0.465 0.074
 Exchangeable Mg −2.76 0.53 2.83 2.07 3.08 4.44 0.92 1.42 2.18 2.95 1.61 0.006 0.596 0.005
 Exchangeable K −0.54 0.27 0.33 2.65 2.75 2.79 0.61 0.55 0.93 2.72 0.64 0.592 0.789 0.742
 Exchangeable Na 0.78 0.11 −1.15 0.11 0.11 0.09 0.04 0.05 0.04 0.10 0.05 0.436 0.910 0.250
Exchangeable Al 2.33 −1.27 −1.30 1.62 0.84 0.56 1.70 0.73 0.42 1.07 1.20 0.020 0.205 0.195
 Exchangeable Mn −1.35 1.18 0.15 0.85 1.10 1.03 0.57 0.58 0.57 1.00 0.58 0.177 0.238 0.879
 BS (%) −2.83 1.14 2.11 76.5 83.3 88.0 9.11 8.07 7.69 81.7 9.23 0.005 0.254 0.035
 Extractable P (mg∙kg−1) −2.04 1.50 0.61 702 798 794 99 183 127 763 153 0.041 0.134 0.541
4-VT (pine n = 36, spruce n = 5, birch n = 4)
 pH CaCl2 −1.94 −0.21 2.96 3.30 3.32 3.88 0.32 0.49 0.17 3.35 0.37 0.052 0.835 0.003
 pH H2O −2.01 − 0.19 3.04 4.30 4.33 4.97 0.36 0.42 0.44 4.36 0.41 0.044 0.848 0.002
 Total C (g∙kg−1) 2.87 −0.64 −3.33 408 369 263 63 48 132 391 79.9 0.004 0.524 0.001
 Total (Ng∙kg−1) − 0.66 −0.08 1.02 9.31 9.35 10.6 2.23 2.44 3.20 9.43 2.31 0.510 0.934 0.309
 С/N 3 −0.5 −3 46 41 24 12 7 7 44 13 0.009 0.626 0.002
 Exchangeable acidity 2.45 −0.35 −3.05 5.03 4.40 1.94 1.66 1.92 1.43 4.68 1.86 0.014 0.725 0.002
 Exchangeable Ca −1.61 0.92 1.25 10.2 12.6 13.6 4.62 6.33 1.54 10.8 4.71 0.108 0.360 0.213
 Exchangeable Mg −1.56 −0.27 2.49 2.19 2.19 3.83 1.21 0.65 1.33 2.34 1.24 0.119 0.785 0.013
 Exchangeable K 1.09 −1.46 0.08 2.22 1.77 2.19 0.63 0.43 0.85 2.16 0.63 0.276 0.145 0.938
 Exchangeable Na 0.88 0.22 −1.48 0.14 0.14 0.09 0.06 0.08 0.08 0.13 0.06 0.381 0.825 0.140
 Exchangeable Al 1.21 0.02 −1.72 1.26 1.17 0.29 1.12 0.76 0.07 1.16 1.06 0.228 0.986 0.086
 Exchangeable Mn −0.31 0.04 0.39 0.85 0.87 0.96 0.49 0.61 0.53 0.86 0.49 0.757 0.968 0.696
 BS (%) −2.25 0.35 2.78 72.4 76.5 91.5 11.8 13.5 4.89 74.6 12.6 0.025 0.729 0.005
 Extractable P (mg∙kg−1) −1.48 1.78 0.12 721 864 749 132 253 275 739 164 0.138 0.075 0.905
  1. acmol(+)∙kg−1