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Moisture Stress and Composition of Xylem Oleoresin in Loblolly Pine

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The effect of moisture stress on composition of xylem oleoresin in large loblolly pines was examined in three tests conducted over a 3-year period. Two of the tests were in the lower Gulf Coastal Plain and one in the upper Coastal Plain. Moisture stress was induced by trenching around individual trees and constructing shelters to prevent recharge of soil moisture. Over the 3-year period, moisture stress was induced in 9 trees. Stress decreased the proportion of resin acids relative to monoterpene hydrocarbons in the oleoresin. Most of the change in resin acids was due to decrease in levopimaric + palustric acid, and most of the change in monoterpene hydrocarbons was due to an increase in α- and -pinene. Trees growing on poorly drained, flat sites showed greater changes than adjacent trees on low mound sites. With stress, the greatest changes occurred in trees which had lost much of their root systems to rootlet pathogens. The changes may influence the susceptibility of trees to attack by bark beetles. Forest Sci. 21:283-290.
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Keywords: Dendroctonus frontalis; Pinus taeda; bark beetles; monoterpene hydrocarbons; resin acids

Document Type: Journal Article

Affiliations: Principal Soil Scientist, Southern Forest Experiment Station, USDA Forest Service, Pineville, La. 71360

Publication date: 1975-09-01

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    Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
    Forest Science is published bimonthly in February, April, June, August, October, and December.

    2016 Impact Factor: 1.782 (Rank 17/64 in forestry)

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    June 1, 2016 to Feb. 28, 2017

    Also published by SAF:
    Journal of Forestry
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