Abstract
Measurements of xylem pressure potential were made to determine the responses of three species to moisture stress. Predawn and diurnal measurements were made on Juniperus ashei, Quercus fusiformis and Quercus texana. Under all soil moisture conditions, the daily min- imum xylem pressure potential reached by J. ashei occurred at the time of day when vapor pres- sure deficit was greatest. Minima for the two oaks occurred before the daily maximum deficit under high stress conditions, suggesting that the stomata of the oaks were more sensitive than those of J. ashei. These responses to increased soil moisture stress indicated two types of drought resistance adaptations. Juniperus ashei is classified as drought-tolerant and Q. fusiformis and Q. texana as drought-avoidant.
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