. 2018 Feb 8;13(2):e0192555. doi: 10.1371/journal.pone.0192555

Table 6. Relationships of leaf physiological variables, growth, and biomass with soil temperature, soil moisture, and other variables.

Response variable	Model	R²
Photosynthesis	P_n = 17.60+4.98E-0.72Tl+0.29T_s	0.81*
Transpiration	E = -2.36+0.12Pn+0.10Tl	0.86**
WUE_i	WUE_i = 12.61–0.28Tl+0.11T_s	0.54**
Number of tillers	N_tiller = 4.53+4.21E+0.018M	0.42**
Maximum Height	H_max = 374.6+0.30M -23.59WUE_i-3.20N_tiller	0.59**
Aboveground Biomass	B_above = -563.20+0.18M+24.93WUE_i+10.43T_s+2.33H_max	0.95**

P_n: Leaf maximum photosynthesis (μmol CO₂ m^-2s^-1); E: transpiration (mmol H₂O m^-2s^-1); WUE_i: water use efficiency (μmol mmol^-1); N_tiller: number of tillers; H_max: maximum plant height (cm); B_above: Aboveground biomass (g pot^-1); T_l: leaf temperature (°C); T_s: soil temperature (°C); M: soil moisture (cb); R²: coefficient of determination. Stars indicate the level of significance (* = p<0.05, ** = p<0.01).