Table 2.

Correlation between photosynthetic variables and environmental factors in Swietenia macrophylla and Melia azedarach during the dry and wet seasons

	Environmental factorsa								CO2
	g s	C i	E	VPDa	VPDl	T a	T 1	PPFD
Dry season
P N	ns/ns	−**/−**	ns/ns	ns/ns	ns/+*	ns/ns	−*/ns	ns/+**	ns/ns
g s		ns/+**	+**/+**	ns/ns	ns/−**	ns/ns	ns/ns	ns/ns	ns/+*
C i			ns/ns	ns/−*	ns/−**	ns/ns	ns/ns	ns/−**	ns/+**
E				ns/ns	ns/ns	ns/ns	ns/+*	ns/ns	ns/ns
Wet season
P N	+**/ns	ns/−*	+**/ns	ns/ns	ns/ns	−**/ns	−**/ns	ns/ns	ns/ns
g s		ns/+**	+**/+**	ns/−**	ns/−**	ns/ns	−*/+*	ns/ns	ns/ns
C i			ns/+*	ns/−**	ns/−**	ns/ns	ns/+*	ns/−**	ns/ns
E				ns/ns	ns/ns	ns/+**	ns/+**	ns/ns	ns/−**

+ and − symbols represent positive and negative correlation, respectively

ns indicates no significant correlation

*^,** Indicate significance at P < 0.05 and P < 0.01, respectively. N = 18

^a g _s (stomatal conductance), C _i (intercellular CO₂ concentration), E (transpiration rate), VPD_a (air vapor pressure deficit), VPD_l (leaf-air vapor pressure deficit), T _a (air temperature), T _l (leaf temperature), PPFD (photosynthetic photon flux density), CO₂ (ambient CO₂ concentration), S. macrophylla/M. azedarach