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Table 9 Correlation coefficients between the climate, tree stand characteristics, the fertility of soil organic horizons and density of different plant 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
Climatic characteristics
 Sum of effective temperatures −0.38 −0.14 0.31 −0.62 0.32 0 0.14 0 0 0
 Precipitation amount for the period of effective temperatures −0.35 −0.12 0.25 −0.54 0.24 0 0.19 0.01 0 0.01
 Amount of precipitation per year −0.35 −0.13 0.25 −0.53 0.24 0 0.16 0.01 0 0.01
 Average annual temperature −0.38 −0.18 0.33 −0.62 0.33 0 0.05 0 0 0
Forest inventory parameters
 Stand volume −0.33 −0.16 0.27 −0.42 0.41 0 0.08 0 0 0
 Height −0.45 −0.21 0.31 −0.48 0.47 0 0.03 0 0 0
 Diameter −0.34 −0.09 0.28 −0.31 0.36 0 0.32 0 0 0
A0 Horizon
 pH H2O −0.04 −0.22 0.24 −0.22 0.18 0.66 0.02 0.01 0.02 0.06
 pH CaCl2 −0.07 −0.28 0.27 −0.24 0.24 0.46 0 0 0.01 0.01
 Total N −0.30 −0.18 0.16 −0.37 0.30 0 0.05 0.08 0 0
 C/N 0.26 0.14 −0.18 0.30 −0.23 0 0.14 0.05 0 0.01
 Exchangeable Ca −0.20 − 0.22 0.21 − 0.34 0.24 0.03 0.02 0.02 0 0.01
 Exchangeable Mg −0.10 − 0.23 0.11 − 0.24 0.23 0.28 0.01 0.25 0.01 0.01
 Exchangeable K −0.30 − 0.29 0.26 − 0.30 0.20 0 0 0 0 0.03
 BS −0.18 − 0.25 0.30 − 0.28 0.24 0.05 0.01 0 0 0.01