Tree diversity patterns along the latitudinal gradient in the northwestern Russia

Forest Ecosystems

Table 2 Spearman rank correlations between proportions of tree species in the plot, biodiversity, stand age, two habitat properties: soil fertility and moisture, and pyrogenic activity recorded as number of fires and burnt area

	Pinus	Picea	Betula	Broadleaf	Biodiversity	Age	Fertility	Moisture
Pinus	1	−0.41	−0.61	−0.20	−0.43	0.23	−0.82	0.02
Picea	−0.41	1	0.09	−0.02	0.58	0.22	0.24	−0.16
Betula	−0.61	0.09	1	0.03	0.45	−0.26	0.46	−0.01
Broadleaf	−0.20	−0.02	0.03	1	0.2	0.01	0.22	−0.03
Biodiversity	−0.43	0.58	0.45	0.2	1	−0.02	0.31	−0.12
Age	0.23	0.22	−0.26	0.01	−0.02	1	−0.26	0.01
Fertility	−0.82	0.24	0.46	0.22	0.31	−0.26	1	0
Moisture	0.02	−0.16	−0.01	−0.03	−0.12	0.01	0	1
Number of fires	−0.18	−0.11	−0.03	0.25	0.03	−0.11	0.28	0.01
Burnt area	−0.16	−0.09	−0.03	0.2	0.03	−0.09	0.24	0.01