Figure 1 | Scientific Reports

Figure 1

From: Physiological mechanisms of drought-induced tree die-off in relation to carbon, hydraulic and respiratory stress in a drought-tolerant woody plant

Figure 1

Mean hydraulic and leaf gas exchange values in individual trees with different leaf area/twig sap area ratios (degrees of tree health). (a) Soil-to-leaf hydraulic conductance. These values were calculated from the transpiration rates and the difference between the predawn and midday leaf water potential. (b) Leaf water potential at midday. (c) Leaf water potential at predawn. (d) Percentage loss of conductivity (PLC) in the branchlets (6 mm in diameter). (e) Near-light saturated net photosynthetic rate per unit area. (f) Maximum water-vapor stomatal conductance. Because the dead tree have no leaves, we could not measure leaf-rerated physiological parameters (a,b,c,e and f). Ordinary least-squares linear regression lines were drawn for statistically significant results (α = 0.05), and the dotted line indicates the decreasing trend of leaf water potential with declining tree health (R 2 = 0.60, p = 0.07). The measurement of PLC was conduced in 7 trees, including the dead tree; PLC in the dead tree was 97%.

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