Fig. 1. Piedmont and coastal forests seasonal patterns (3-month average except for precipitation that represents a 3-month sum) in daylength-normalized vapor pressure
deficit (i.e. mean daily vapor pressure deficit times the proportion of hours when photosynthetically active radiation >0), precipitation, soil moisture content of the upper soil
profile (0–45 cm) and reference canopy stomatal conductance (Gs-ref). Down arrows in top panels represent the onset of the 2002 and 2008 droughts, respectively. Error bars
for vapor pressure deficit and precipitation represent the standard errors associated with the mean values between stands.