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

Forest Ecosystems

Table 9 Correlation coefficients between the climate, tree stand characteristics, the fertility of soil organic horizons and density of different plant functional groups

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