Oleoresin Exudation Pressure and Relative Water Content of Inner Bark as Indicators of Moisture Stress in Loblolly Pines

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Diurnal patterns of oleoresin exudation pressure of Pinus taeda L. were related to changes in soil and atmospheric moisture. Single, early-morning measurements were not closely indicative of soil moisture stress. Relative water content of inner bark reflected soil moisture status and diameter growth response, and apparently was affected by atmospheric moisture deficit. Trees continuously flooded eventually showed the most severe reduction in oleoresin exudation pressure and relative water content, and were successfully attacked by bark beetles.

Document Type: Journal Article

Affiliations: Plant Physiologist, Southern Forest Experiment Station, Forest Service, U. S. Dept. Agric., Alexandria, La.

Publication date: December 1, 1968

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