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

Forest Ecosystems

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

Parameters	Lichens	Green moss	Grasses & sedges	Dwarf shrubs	Herbs	Lichens	Green moss	Grasses & sedges	Dwarf shrubs	Herbs
Parameters	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