Table 2 Correlation coefficients of photosynthesis and physiological water indices of P. sepium.

Index	P_n	T_r	G_s	WUE	F_v/F_m	Ф_PSII	ETR	NPQ	POD	SOD	MDA	Ss	Pro	AQY	LSP	P_max	LCP	R_d	CSF
P_n	1	0.948	0.913	0.660	0.897	0.969^*	0.968^*	−0.997^**	−0.940	0.181	−0.725	−0.990^*	−0.994^**	0.946	0.838	0.999^**	−0.722	0.982^*	0.993^**
T_r		1	0.995^**	0.404	0.734	0.975^*	0.984^*	−0.970^*	−0.998^**	−0.007	−0.854	−0.894	−0.912	0.873	0.638	0.944	−0.722	0.898	0.978^*
G_s			1	0.324	0.674	0.959^*	0.971^*	−0.943	−0.996^**	−0.049	−0.867	−0.847	−0.870	0.829	0.562	0.908	−0.696	0.852	0.954^*
WUE				1	0.917	0.566	0.534	−0.607	−0.406	0.737	0.012	−0.751	−0.738	0.585	0.829	0.652	−0.201	0.676	0.583
F_v/F_m					1	0.848	0.827	−0.869	−0.737	0.568	−0.347	−0.939	−0.941	0.796	0.873	0.888	−0.434	0.879	0.855
Ф_PSII						1	0.999^**	−0.983^*	−0.981^*	0.217	−0.717	−0.935	−0.957^*	0.849	0.686	0.959^*	−0.602	0.906	0.987^*
ETR							1	−0.984^*	−0.989^*	0.173	−0.747	−0.928	−0.950^*	0.855	0.675	0.959^*	−0.626	0.906	0.989^*
NPQ								1	0.965^*	−0.150	0.756	0.975^*	0.984^*	−0.931	−0.792	−0.994^**	0.717	−0.967^*	−0.999^**
POD									1	−0.038	0.826	0.883	0.906	−0.843	−0.607	−0.933	0.672	−0.877	−0.974^*
SOD										1	0.524	−0.257	−0.281	−0.045	0.235	0.149	0.488	0.107	0.136
MDA											1	0.644	0.644	−0.790	−0.457	−0.740	0.892	−0.728	−0.768
Ss												1	0.997^**	−0.947	−0.900	−0.990^**	0.698	−0.987^*	−0.967^*
Pro													1	−0.928	−0.866	−0.991^**	0.665	−0.976^*	−0.977^*
AQY														1	0.903	0.959^*	−0.890	0.986^*	0.922
LSP															1	0.852	−0.707	0.912	0.770
P_max																1	−0.750	0.989^*	0.990^*
LCP																	1	−0.804	−0.712
R_d																		1	0.959^*
CSF																			1

* means a significant correlation at the 0.05 level (two-tailed); ** means a significant correlation at the 0.01 level (two-tailed);
CSF, cumulative sap flow.

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