Figure 1 | Scientific Reports

Figure 1

From: Groundwater extraction reduces tree vitality, growth and xylem hydraulic capacity in Quercus robur during and after drought events

Figure 1

Strongest correlations between hydro-climatic variables (precipitation, temperature, standardized precipitation evapotranspiration index (SPEI 6), upper and total soil moisture index (SMI)) and ring-width chronologies ((a): ring-; (b): earlywood; and (c); latewood-width). Columns highlighted in grey show seasonal averages. SMI: Soil moisture index. Symbol size indicates correlation strength for each ring-width variable.  The strongest correlation in absolute terms was observed betwen earlywood and June SMI1.8 (r = 0.6), while the lowest correlation between latewood and July temperature (r = − 0.25). 

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