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Table 8 Correlation coefficients between climatic variables, tree stand characteristics, the fertility of soil organic horizons, and the number of plant species of different functional groups

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

Parameters Lichens Green moss Grasses & sedges Dwarf shrubs Herbs Lichens Green moss Grasses & sedges Dwarf shrubs Herbs
R p
Climate
 Sum of effective temperatures − 0.42 0.18 0.53 −0.53 0.39 0 0.05 0 0 0
 Precipitation amount at the period of effective temperatures −0.38 0.03 0.41 −0.45 0.26 0 0.73 0 0 0
 Amount of precipitation per year −0.37 0.10 0.37 −0.45 0.23 0 0.30 0 0 0.01
 Average annual temperature −0.45 0.18 0.56 −0.51 0.41 0 0.06 0 0 0
Forest inventory parameters (all areas)
 Stand volume −0.51 0.13 0.44 −0.54 0.42 0 0.17 0 0 0
 Height −0.61 0.26 0.59 −0.65 0.54 0 0 0 0 0
 Diameter −0.51 0.17 0.51 −0.46 0.44 0 0.06 0 0 0
A0 Horizon
 pH H2O −0.10 0.29 0.25 −0.11 0.23 0.28 0 0.01 0.22 0.01
 pH CaCl2 −0.16 0.32 0.31 −0.16 0.31 0.09 0 0 0.09 0
 Total N −0.34 0.18 0.40 −0.36 0.35 0 0.05 0 0 0
 C/N 0.24 −0.22 −0.33 0.31 −0.32 0.01 0.02 0 0 0
 Exchangeable Ca −0.25 0.33 0.36 −0.28 0.37 0.01 0 0 0 0
 Exchangeable Mg −0.12 0.33 0.27 −0.14 0.30 0.18 0 0 0.12 0
 Exchangeable K −0.41 −0.04 0.37 −0.30 0.28 0 0.64 0 0 0
 BS −0.23 0.22 0.35 −0.22 0.36 0.01 0.02 0 0.02 0