Graduate Thesis Or Dissertation
 

Seasonal and diurnal variation in internal moisture stress of mature Douglas-fir

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  • The internal moisture stress of Douglas-fir was determined on foliage collected in the Siskiyou Mountains of southwestern Oregon. Internal moisture stress integrates both climatic and edaphic environmental effects as they influence a plants moisture regime. In this study two laboratory techniques were modified to permit stress measurements to be taken on mature trees in the field. The internal moisture stress was determined directly using vapor equilibrium techniques to measure the diffusion pressure deficit of needle tissue. Relative turgidity, an indirect estimate of stress, was obtained by measuring the relative water content of needle tissue. Tissue was collected from four areas between 27OO and 500 feet in elevation. Relative turgidity determinations proved to be of limited value due to seasonal variations not associated with changes in the internal moisture stress. The technique was, however, of value in providing data concerning diurnal fluctuations and may serve as a measure of the differences in internal moisture stress of trees at the same location. Using an early morning sampling time, differences between plots were small. By sampling at 1500 hours in late summer, values ranging from 8. 5 to 30 atmospheres stress were recorded. Internal moisture stress was not a simple function of either elevation or soil moisture stress. A biologically meaningful classification of tree moisture status was possible based on the maximum seasonal and diurnal internal moisture stress measured during the growing season.
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