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Food Reserves and Seasonal Growth of Douglas-Fir Seedlings

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Seasonal growth of tops and roots and concomitant trends in food reserves were observed biweekly on Pseudotsuga menziesii (Mirb.) Franco seedlings of two seed sources growing in a Pacific Northwest forest nursery. A general pattern of alternating root, diameter, and shoot growth was found. Rapid root growth did not coincide with rapid shoot elongation, but preceded and followed it. Increased root activity was strongly correlated with lowered reducing sugar concentrations in seedling roots of the faster growing source. Sucrose and raffinose increased markedly during early winter and were apparently converted to starch in spring prior to growth. Concentrations of reducing sugars, crude fat, and protein nitrogen changed little with season. Implications of this information on timing of lifting, storage, and transplanting of seedlings are discussed.

Document Type: Journal Article

Affiliations: Principal Mycologist, Pacific Northwest Forest and Range Expt. Sta., Forest Service, U.S. Dept. Agric., Portland, Oreg.

Publication date: June 1, 1967

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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