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Earlywood-Latewood Features of Red Pine Grown Under Simulated Drought and Irrigation

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Six Pinus resinosa Ait. trees, 20 years old and 21 feet in height, on a sandy Podzol in northern lower Michigan, were subjected to controlled soil moisture treatments. Three were irrigated to maintain soil at field capacity, and three subjected to artificial drought by confining their roots under sheds. Terminal growth and cambial activity were measured in detail throughout one season of treatment. Annual rings in upper and lower boles were analyzed for gross anatomical features at the end of the season. In lower boles, approximately 100 percent more xylem was formed in irrigated trees than in drought trees, both in wood volume and in numbers of tracheids. In the upper bole about 50 percent more xylem was formed in irrigated trees. Mork's definition latewood was greater in size of cells and in number at all stem positions in irrigated trees, but percentage of latewood was equal in both treatments at comparable stem positions. Initiation of flattened latewood cells began in late July at breast height for trees under drought, but not until late September for irrigated trees. Cessation of needle elongation was not well correlated with time of cell size changeover at breast height, but was correlated in the crown portion of the stem. Rates of needle elongation, however, could be related to tracheid flattening. The relationships are discussed in terms of modern theories of wood formation, and both direct and indirect effects of water are considered.

Document Type: Journal Article

Affiliations: Forester, West Virginia Pulp and Paper Co.

Publication date: 1964-09-01

More about this publication?
  • 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.

    2015 Impact Factor: 1.702
    Ranking: 16 of 66 in forestry

    Also published by SAF:
    Journal of Forestry
    Other SAF Publications
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