Table 1.

Summary of meta-analytical model values for the effects of temperature, precipitation and mixture type on overyielding (OY) in old forests. Parameter estimates (b) in italics show significant effects.

models	parameters	b [−CI; +CI]
OYi ∼ precipitation	intercept	0.13 [0.05; 0.21]
	precipitation	0.16 [0.05; 0.27]
OYi ∼ mixture type + precipitation	intercept	0.1 [0.01; 0.19]
	mixture type: EE	0.08 [−0.07; 0.23]
	precipitation	0.18 [0.07; 0.28]
OYi ∼ N-fixing + precipitation	intercept	0.08 [−0.02; 0.19]
	precipitation	0.12 [−0.01; 0.26]
	N-fixing: present	0.11 [−0.1; 0.33]
OYi ∼ temperature + precipitation	intercept	0.12 [0.05; 0.20]
	precipitation	0.14 [0.02; 0.26]
	temperature	0.05 [−0.05; 0.14]