. 2014 Dec 15;4:7483. doi: 10.1038/srep07483

Table 3. Correlation analysis between water use efficiency and the controlling environmental factors in terrestrial ecosystems according to plant functional types.

	Plant functional type	R_g	T_a	VPD	T_s	P_r	SWC
WUE	Broad-leaved evergreen	−0.645^**	−0.600^**	−0.669^**	−0.606^**	0.151	0.541^**
	Needleleaf evergreen	0.599^**	0.795^**	0.524^**	0.808^**	−0.092	−0.178
	Broad-leaved deciduous	0.631^**	0.739^**	0.483^**	0.786^**	0.234	−0.633^**
	Mixed forest	0.730^**	0.901^**	0.783^**	0.925^**	0.212	0.136
	Grassland	0.597^**	0.594^**	0.574^**	0.670^**	−0.096	−0.442^**
	Crop	0.525^**	0.693^**	0.504^**	0.688^**	−0.172	−0.228

**Correlation is significant at the 0.01 level. R_g refers to global radiation. T_a refers to air temperature. VPD refers to vapour pressure deficit. T_s refers to soil temperature. P_r refers to precipitation. SWC refers to soil water content.