Table 3. Comparison of best phenological regression models for combined and historical data.

		Historical data					Combined data
Tree species	Phenophase	Slope	SE	tdf	p	R2 adj	Slope	SE	tdf	p	R2 adj
P. bolleana	BL*	−0.23	0.05	−4.318	<.001	0.66	−0.22	0.03	−8.6024	<.001	0.79
	L1*	−0.14	0.03	−4.258	<.001	0.65	−0.15	0.02	−9.1424	<.001	0.77
	LA	−0.22	0.06	−3.577	<.001	0.59	−0.22	0.04	−5.7724	<.001	0.56
S. babylonica	BL*	−0.24	0.05	−4.547	<.001	0.71	−0.24	0.04	−5.7219	<.001	0.84
	L1	−0.23	0.04	−5.427	<.001	0.78	−0.25	0.03	−7.4820	<.001	0.72
	LA	−0.14	0.02	−5.849	<.001	0.77	−0.08	0.02	−3.5421	0.002	0.61
	BF*	−0.22	0.13	−1.655	0.16	0.22	−0.27	0.08	−3.288	0.01	0.52
	F1*	−0.17	0.06	−2.877	<.001	0.47	−0.20	0.04	−4.6410	0.001	0.65
	PF*	−0.13	0.05	−2.646	0.04	0.46	−0.12	0.03	−4.2710	0.002	0.61
U. pumila	BL*	−0.09	0.08	−1.1114	0.29	0.02	−0.10	0.07	−1.3717	0.19	0.26
	L1*	−0.07	0.02	−3.3117	<.001	0.36	−0.08	0.02	−3.4723	0.002	0.46
	LA*	−0.04	0.02	−2.3619	0.03	0.19	−0.04	0.02	−2.3024	0.03	0.60
	F1	−0.10	0.04	−2.7615	0.015	0.29	−0.10	0.03	−3.1820	0.005	0.30

Notes: Phenophases are same as in Table 1. SE = standard error of the slope. Bold face font indicates significance at p<0.05.

^*denotes phenophases for which combining historical and spatial data resulted in improvements.