Table 1. Summary of reduced major axis (RMA) regression results.

	Individual level					Species level					PICs					P value for likelihood ratio test
	bind.	95% CI	r2	P	N	bsp	95% CI	r2	P	Nsp	bPIC	95% CI	r2	P	Ntip	bind.vs. bsp	bsp vs. bPIC
Roots vs. leaves:
N storage	1.20	1.16–1.25	0.88	<0.001	335	1.30	1.21–1.41	0.85	<0.001	98	1.20	1.10–1.30	0.82	<0.001	98	0.078	0.167
P storage	1.16	1.11–1.2	0.87	<0.001	334	1.26	1.15–1.37	0.82	<0.001	98	1.20	1.09–1.32	0.79	<0.001	98	0.083	0.470
N concentration	1.79	1.68–1.91	0.37	<0.001	613	2.07	1.79–2.38	0.51	<0.001	107	2.04	1.72–2.43	0.20	<0.001	107	0.073	0.721
P concentration	1.52	1.42–1.64	0.22	<0.001	608	1.56	1.34–1.83	0.33	<0.001	107	1.61	1.38–1.89	0.32	<0.001	107	0.770	0.365
Stems vs. leaves:
N storage	1.06	1.03–1.09	0.91	<0.001	357	1.10	1.02–1.18	0.87	<0.001	104	1.02	0.97–1.08	0.92	<0.001	104	0.355	0.117
P storage	1.02	0.99–1.05	0.91	<0.001	358	1.07	0.99–1.15	0.86	<0.001	105	1.01	0.95–1.07	0.92	<0.001	105	0.242	0.204
N concentration	1.55	1.45–1.66	0.23	<0.001	655	1.72	1.49–1.99	0.37	<0.001	115	1.74	1.45–2.09	0.04	0.025	115	0.201	0.962
P concentration	1.15	1.07–1.24	0.12	<0.001	650	1.07	0.91–1.26	0.23	<0.001	116	1.15	0.96–1.37	0.08	<0.001	116	0.411	0.571
Roots vs. stems:
N storage	1.12	1.09–1.16	0.91	<0.001	343	1.14	1.07–1.22	0.89	<0.001	103	1.16	1.07–1.25	0.84	<0.001	103	0.617	0.778
P storage	1.12	1.08–1.16	0.89	<0.001	344	1.15	1.06–1.23	0.85	<0.001	104	1.18	1.07–1.26	0.8	<0.001	104	0.599	0.612
N concentration	1.14	1.09–1.19	0.67	<0.001	652	1.22	1.11–1.33	0.75	<0.001	113	0.94	0.80–1.11	0.34	<0.001	113	0.185	0.008
P concentration	1.34	1.26–1.43	0.29	<0.001	646	1.48	1.26–1.74	0.22	<0.001	113	1.50	1.25–1.81	0.03	0.050	113	0.286	0.894

Abbreviations: PIC, phylogenetically independent contrast; CI, confidence interval.

Regression slopes (b_ind., b_sp and b_PIC) estimates in bold are significantly different from 1, indicate that the scaling relationship of the two traits are anisometric.