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Food Reserves of Engelmann Spruce Planting Stock

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Eight classes of three-yr-old Engelmann spruce planting stock were analyzed for carbohydrate, protein, lipid, and hemicellulose. The classes were: transplanted and undisturbed trees grown in the open or under 50 percent shade at two locations--a low-elevation nursery (ca. 7,000 ft) and a high-elevation holding bed (ca. 10,300 ft) where trees were held for 1 yr following transplanting from the nursery. Reserve foods and dry weights of trees grown solely in the nursery were also determined after 0, 2, and 4 mo storage. Transplanting reduced dry weight whether seedlings were transplanted in nursery or holding beds. Carbohydrates and hemicelluloses were similarly reduced by transplanting in the nursery, but lipid concentration was increased. Protein concentration was not affected. Dry weight and carbohydrate concentration were reduced by 4 mo storage, but proteins and lipids were not affected regardless of length of storage. Hemicellulose concentrations were highest following 2 mo storage. Survival of field-planted trees was not correlated with food reserves. However, survival may be adversely affected by carbohydrate concentrations below certain threshold levels when trees are planted. Forest Sci. 19:213-219.

Keywords: Picea engelmannii; carbohydrates; nursery practice

Document Type: Journal Article

Affiliations: Principal Silviculturist, Rocky Mountain Forest and Range Exp. Stn., USDA Forest Service, with central headquarters maintained at Fort Collins, Colorado, in cooperation with Colorado State University

Publication date: September 1, 1973

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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