. 2016 Jan 13;36(3):273–286. doi: 10.1093/treephys/tpv134

Table 2.

Linear regression parameters for different morphological leaf traits (LT, leaf thickness; LMA, leaf mass per unit area) depending on different climatic and soil variables (C, current-year leaves; C + 1, 1-year-old leaves; C + 2, 2-year-old leaves). Only significant (P < 0.05) relationships are shown. R, total annual rainfall; I, Emberger's pluviothermic index; SR, solar global radiation; min T, minimum winter temperature; max T, maximum summer temperature; F, number of days with frost per year.

Independent variables	R²	F	Intercept	Slope	P	Independent variables	R²	F	Intercept	Slope	P
LT (μm)						LMA (g m⁻²)
Q. suber C (n = 49)						Q. suber C (n = 49)
R (mm)	0.49	25.3	319	−0.051	<0.0001	R (mm)	0.51	27.0	215	−0.051	<0.0001
I	0.35	13.8	330	−0.601	<0.0001	I	0.39	16.5	228	−0.623	<0.0001
SR (W m⁻²)	0.15	4.7	−702	5.32	0.0390	F	0.64	45.9	158	0.597	<0.0001
F	0.69	59.0	261	0.636	<0.0001	Min T (°C)	0.69	57.9	143	−5.78	<0.0001
Min T (°C)	0.73	71.4	245	−6.08	<0.0001	Max T (°C)	0.21	6.7	342	−3.93	0.0155
Max T (°C)	0.31	11.8	489	−4.96	0.0020	Soil N (%)	0.51	26.8	207	−343	<0.0001
Soil N (%)	0.63	44.4	316	−390	<0.0001	Soil P (p.p.m.)	0.32	12.3	190	−0.797	0.0017
Soil P (p.p.m.)	0.32	12.1	294	−0.808	0.0018
Q. ilex C (n = 75)						Q. ilex C (n = 75)
R (mm)	0.27	13.7	366	−0.086	<0.0001	R (mm)	0.31	16.7	268	−0.056	<0.0001
SR (W m⁻²)	0.25	12.6	1165	−4.70	0.0011	SR (W m⁻²)	0.33	18.0	816	−3.21	<0.0001
F	0.64	66.8	266	0.679	<0.0001	F	0.75	114	203	0.443	<0.0001
Min T (°C)	0.62	59.7	257	−5.47	<0.0001	Min T (°C)	0.76	115	196	−3.65	<0.0001
Max T (°C)	0.12	5.1	571	−6.40	0.0295	Max T (°C)	0.21	9.8	438	−5.05	0.0034
soil P (p.p.m.)	0.25	12.3	329	−1.95	0.0012	Soil P (p.p.m.)	0.31	16.5	245	−1.31	<0.0001
Q. ilex C + 1 (n = 107)						Q. ilex C + 1 (n = 107)
R (mm)	0.32	26.1	361	−0.073	<0.0001	R (mm)	0.25	19.1	276	−0.045	<0.0001
SR (W m⁻²)	0.42	39.8	1176	−4.74	<0.0001	SR (W m⁻²)	0.30	24.6	755	−2.79	<0.0001
F	0.83	266	275	0.599	<0.0001	F	0.60	85.3	224	0.352	<0.0001
Min T (°C)	0.83	265	265	−4.94	<0.0001	Min T (°C)	0.62	92.1	218	−2.95	<0.0001
Max T (°C)	0.27	20.8	616	−7.40	<0.0001	Max T (°C)	0.23	16.3	437	−4.65	<0.0001
soil P (p.p.m.)	0.30	23.9	330	−1.68	<0.0001	soil P (p.p.m.)	0.26	19.7	258	−1.07	<0.0001
P. pinaster C (n = 56)						P. pinaster C (n = 56)
I	0.16	5.0	808	2.74	0.0341	SR (W m⁻²)	0.25	8.6	844	−2.53	0.0069
SR (W m⁻²)	0.39	16.5	3655	−14.4	<0.0001	F	0.53	29.2	356	0.390	<0.0001
F	0.45	20.9	919	1.63	<0.0001	Min T (°C)	0.52	27.8	347	−3.31	<0.0001
Min T (°C)	0.45	21.6	881	−14.1	<0.0001	Max T (°C)	0.27	9.7	635	−6.19	0.0045
						R (mm)	0.11	4.6	457	−0.059	0.0382
P. pinaster C + 1 (n = 78)						P. pinaster C + 1 (n = 78)
R (mm)	0.10	4.2	1172	−0.172	0.0481	SR (W m⁻²)	0.15	7.0	944	−2.88	0.0118
I	0.14	6.2	868	2.44	0.0168	F	0.36	22.2	389	0.464	<0.0001
SR (W m⁻²)	0.45	31.9	3791	−15.0	<0.0001	Min T (°C)	0.35	21.2	379	−3.93	<0.0001
F	0.55	47.1	950	1.72	<0.0001	Max T (°C)	0.22	11.0	750	−8.05	0.0020
Min T (°C)	0.55	46.9	910	−14.8	<0.0001	R (mm)	0.13	5.5	499	−0.072	0.0239
Max T (°C)	0.16	7.2	1905	−20.5	0.0106
P. pinaster C + 2 (n = 78)						P. pinaster C + 2 (n = 78)
SR (W m⁻²)	0.26	13.0	3512	−13.3	<0.0001	I	0.12	5.1	386	0.836	0.0298
F	0.36	21.4	974	1.70	<0.0001	SR (W m⁻²)	0.45	31.0	1452	−5.49	<0.0001
Min T (°C)	0.36	21.1	936	−14.5	<0.0001	F	0.64	66.5	406	0.701	<0.0001
Max T (°C)	0.13	5.8	2013	−22.6	0.0213	Min T (°C)	0.62	62.2	391	−5.94	<0.0001
						Max T (°C)	0.21	10.2	817	−8.88	0.0028