Table 2. Correlation coefficients between drought stress and photosynthetic, chlorophyll fluorescence parameters, canopy temperature during August 1 to 31, 2021 in P. maximowiczii.

Test	Correlation coefficient (r2)
	DS	Pn max	Lcomp	Dresp	Φ	E	WUE	ΦPO	ΨO	ΦEO	ABS/RC	TRO/RC	ETO/RC	DIO/RC	PIABS	Ts-Ta
DS	-	−0.835**	−0.834**	−0.609**	−0.758**	−0.110	−0.598**	−0.837**	−0.892**	−0.633**	−0.835**	−0.838**	−0.886**	−0.917**	−0.967**	−0.940**
Pn max		-	0.843**	0.796**	0.783**	0.426**	0.444**	0.622**	0.868**	0.587**	0.774**	0.560**	0.794**	0.703**	0.788**	−0.873**
Lcomp			-	0.724**	0.812**	0.346**	0.360**	0.694**	0.848**	0.659**	0.832**	0.605**	0.860**	0.810**	0.867**	−0.914**
Dresp				-	0.571**	0.633**	0.080	0.461**	0.710**	0.381**	0.702**	0.394**	0.804**	0.614**	0.762**	−0.829**
Φ					-	0.260*	0.431**	0.576**	0.844**	0.595**	0.811**	0.624**	0.801**	0.755**	0.847**	−0.871**
E						-	−0.571**	−0.039	0.160	0.145	0.017	−0.325	0.253	−0.084	0.105	−0.348
WUE							-	0.516*	0.563**	0.232	0.616**	0.723**	0.404	0.647**	0.506*	−0.369*
ΦPO								-	0.755**	0.661**	0.726**	0.790**	0.717**	0.811**	0.766**	−0.760**
ΨO									-	0.586**	0.851**	0.780**	0.866**	0.750**	0.801**	−0.931**
ΦEO										-	0.426	0.474*	0.484*	0.664**	0.582**	−0.560
ABS/RC											-	0.824**	0.863**	0.824**	0.917**	−0.925
TRO/RC												-	0.655**	0.832**	0.777**	−0.745**
ETO/RC													-	0.717**	0.861**	−0.935**
DIO/RC														-	0.898**	−0.821**
PIABS															-	−0.940**
PIABS																-