Fig. 3

Spatial distribution of significant correlations between annual WUE and TEMP in the SRB (a) (ENC: Extremely significant negative correlation, SNC: Significant negative correlation; UNC: Unsignificant negative correlation, UPC: Unsignificant positive correlation, SPC: Significant positive correlation, EPC: Extremely significant positive correlation; the same applies to the following explanations) and the heatmap of correlations between WUE and TEMP in different ecological functional areas (b) (WUE 1/2/3/4 represent the WUE values of Zones I/II/III/IV, respectively, and the same applies to the following explanations; Temp 1/2/3/4 represent the annual average temperatures of Zones I/II/III/IV, respectively).