Fig. 6From: Below-ground hydraulic constraints during drought-induced decline in Scots pineModelled response surfaces of below-crown stem pressure difference (ΔPbc) as a function of vapour pressure deficit (VPD), soil water content (SWC) and defoliation class (Table 4). Dots represent the VPD and SWC values corresponding to the measured ΔPbc values, coloured by season (cf. Section 2)Back to article page