Table 3.

Summary of final model fixed effects (Model d) for δ¹⁸O and δ²H. Carya, Pinus and Quercus were dummy variables for genus (reference is Acer).

Model	Fixed effect	Estimate	Standard error	t-Value
δ18O	(Intercept)	−3.3	0.37	−8.88
	Genus
	Carya	−1.0	0.39	−2.60
	Pinus	−0.85	0.48	−1.76
	Quercus	−1.2	0.30	−3.98
	DBH	−0.02	0.01	−1.61
	Soil depth	−0.02	0.007	−2.25
δ2H	(Intercept)	−29.0	2.2	−13.18
	Genus
	Carya	−4.05	2.3	−1.76
	Pinus	−1.67	2.8	−0.59
	Quercus	−8.60	1.8	−4.80
	DBH	−0.20	0.085	−2.325
	Soil depth	−0.08	0.039	−1.990