Is vulnerability segmentation at the leaf-stem transition a drought resistance mechanism? A theoretical test with a trait-based model for Neotropical canopy tree species

Table 3 Relationships between the constitutive traits of t_crit model and the t_crit output

Predictor	All species		Segmented species only
Predictor	R²	P-value	R²	P-value
P_88,leaf—P_88,stem	0.842	< 0.001	0.776	< 0.001
Ψ_tlp—P_88,leaf	0.782	< 0.001	0.769	< 0.001
P_88,stem	0.711	< 0.001	0.581	< 0.01
g_bark	0.155	0.108	0.020	0.667
P_88,leaf	0.143	0.130	0.240	0.110
A_leaf	0.131	0.140	0.275	0.084
A_leaf—A_bark	0.131	0.140	0.275	0.084
C_stem A_bark⁻¹—C_shoot A_leaf+bark⁻¹	0.111	0.176	0.290	0.075
C_stem A_bark⁻¹	0.097	0.209	0.283	0.075
g_min—g_bark	0.085	0.239	0.220	0.128
V_stem	0.081	0.253	0.283	0.115
W_ft,stem * V_stem	0.071	0.283	0.213	0.134
W_tlp,leaf * A_leaf	0.059	0.331	0.047	0.499
g_min*2A_leaf	0.056	0.344	0.063	0.430
A_bark	0.026	0.519	0.020	0.667
C_shoot A_leaf+bark⁻¹	0.019	0.580	0.013	0.733
g_min2A_leaf—g_barkA_bark	0.012	0.662	0.005	0.834
W_tlp,leaf	0.012	0.662	0.063	0.430
Ψ_tlp	0.003	0.818	0.004	0.852
W_ft,stem	0.002	0.869	0.099	0.320
g_min	0.002	0.852	0.020	0.667
g_bark*A_bark	0.000	1.000	0.022	0.651

Predictors are ordered by R² for all species. R² and P-values are shown in bold type for significant relationships. All acronyms are listed in Table 1

ISSN: 1297-966X