Table 7.

Pearson correlation coefficients among different physiological parameters of B. papyrifera (n = 60).

	gs	C i	Tr	WUE	C p	R	Z
P N	0.861 **	0.535 **	0.719 **	−0.011	0.031	−0.236	−0.043
gs		0.725 **	0.753 **	−0.153	0.148	−0.289 *	−0.144
C i			0.356 **	0.114	0.205	−0.369 **	−0.057
Tr				−0.684 **	0.221	−0.212	−0.294 *
WUE					−0.281 *	0.039	0.445 **
C p						−0.548 **	−0.712 **
R							0.471 **

Note: ** Correlation is significant at the 0.01 level. Two-tailed significance was used. * Correlation is significant at the 0.05 level. Two-tailed significance was used. P_N: the net photosynthetic rate. g_s: the stomatal conductance. C_i: the intercellular CO₂ concentration. Tr: the transpiration rate. WUE: the water use efficiency. C_p: the physiological capacitance. R: the physiological resistance. Z: the physiological impedance.